diff --git a/content/06_electronics_design.md b/content/06_electronics_design.md
new file mode 100644
index 0000000000000000000000000000000000000000..72817511f21c028d0662a36267fd244240217a17
--- /dev/null
+++ b/content/06_electronics_design.md
@@ -0,0 +1,41 @@
++++
+title = "Electronics Design"
+date = "2018-10-09"
+menu = "main"
+weight = 7
++++
+
+## PCB Design
+
+Files: [echo.sch](/designs/06_echo.sch) [echo.brd](/designs/06_echo.brd) [echo_top.png](/designs/06_echo_top.png) [echo_cutout.png](/designs/06_echo_cutout.png) (both 2000 dpi)
+
+This week we're learning how to go all the way from pcb design through milling, stuffing, and programming. I should end up with a board that can talk to a computer over a serial connection (masquerading as a USB device).
+
+### Design
+
+Since I've been using Fusion 360 so much, I decided to give EAGLE a try. (I'm also curious to use KiCad, but at this point I want to get comfortable in one environment before trying another.) After importing the fab library and design rules, I was ready to go.
+
+Drawing the schematic was simple enough. From the [reference design](http://academy.cba.mit.edu/classes/embedded_programming/index.html#echo) I just added a switch and an LED (with current limiting resistor). I checked that all GPIO pins on the ATTINY44 have internal pullup resistors, so I'm going to rely on those to pull my input high when the switch is open. To get a value for the current limiting resistor, I plugged in the current rating and forward voltage drop of our LEDs to an [online calculator](https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-led-series-resistor). I found that 330 ohms would be ideal, so I went with the closest value we stock in bulk: 499 ohms.
+
+![](/img/06_schematic.jpg#c)
+
+Drawing the traces was more challenging. It took me a few tries before I was able to pack the components in a reasonable amount of space with relatively short routes. I'm still not super pleased with how indirect the ground path to the microcontroller is. I look forward to designing more boards and getting a better intuition for circuit layout.
+
+![](/img/06_board.png#c)
+
+### Production
+
+When I started milling my design, it was obviously too large. Turns out the DPI of images exported by EAGLE on retina MacBooks ends up twice as high as claimed. Luckily this is easily fixed in mods by overriding the value embedded in the png.
+
+At this point I feel like a pro at stuffing. It went by pretty quickly and I'm happy with all my joints.
+
+### Programming
+
+It had been a few years since I've flashed a microcontroller so I was uncertain how many issues I should expect to run into. Luckily things went pretty smoothly. I encountered a few "device not found" errors that were circumvented by unplugging and replugging the programmer and boards.
+
+![](/img/06_pcb_plus_ftdi.jpg#c)
+
+Communication with my computer was achieved!
+
+![](/img/06_let_there_be_bits.png#c)
+
diff --git a/static/designs/06_echo.brd b/static/designs/06_echo.brd
new file mode 100644
index 0000000000000000000000000000000000000000..8f66889b56fb2ac1e8632b14155b5d4b5298b2e5
--- /dev/null
+++ b/static/designs/06_echo.brd
@@ -0,0 +1,709 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE eagle SYSTEM "eagle.dtd">
+<eagle version="9.1.3">
+<drawing>
+<settings>
+<setting alwaysvectorfont="no"/>
+<setting verticaltext="up"/>
+</settings>
+<grid distance="10" unitdist="mil" unit="mil" style="lines" multiple="1" display="no" altdistance="5" altunitdist="mil" altunit="mil"/>
+<layers>
+<layer number="1" name="Top" color="4" fill="1" visible="yes" active="yes"/>
+<layer number="2" name="Route2" color="16" fill="1" visible="no" active="no"/>
+<layer number="3" name="Route3" color="17" fill="1" visible="no" active="no"/>
+<layer number="4" name="Route4" color="18" fill="1" visible="no" active="no"/>
+<layer number="5" name="Route5" color="19" fill="1" visible="no" active="no"/>
+<layer number="6" name="Route6" color="25" fill="1" visible="no" active="no"/>
+<layer number="7" name="Route7" color="26" fill="1" visible="no" active="no"/>
+<layer number="8" name="Route8" color="27" fill="1" visible="no" active="no"/>
+<layer number="9" name="Route9" color="28" fill="1" visible="no" active="no"/>
+<layer number="10" name="Route10" color="29" fill="1" visible="no" active="no"/>
+<layer number="11" name="Route11" color="30" fill="1" visible="no" active="no"/>
+<layer number="12" name="Route12" color="20" fill="1" visible="no" active="no"/>
+<layer number="13" name="Route13" color="21" fill="1" visible="no" active="no"/>
+<layer number="14" name="Route14" color="22" fill="1" visible="no" active="no"/>
+<layer number="15" name="Route15" color="23" fill="1" visible="no" active="no"/>
+<layer number="16" name="Bottom" color="1" fill="1" visible="no" active="yes"/>
+<layer number="17" name="Pads" color="2" fill="1" visible="no" active="yes"/>
+<layer number="18" name="Vias" color="2" fill="1" visible="no" active="yes"/>
+<layer number="19" name="Unrouted" color="6" fill="1" visible="no" active="yes"/>
+<layer number="20" name="Dimension" color="24" fill="1" visible="no" active="yes"/>
+<layer number="21" name="tPlace" color="7" fill="1" visible="no" active="yes"/>
+<layer number="22" name="bPlace" color="7" fill="1" visible="no" active="yes"/>
+<layer number="23" name="tOrigins" color="15" fill="1" visible="no" active="yes"/>
+<layer number="24" name="bOrigins" color="15" fill="1" visible="no" active="yes"/>
+<layer number="25" name="tNames" color="7" fill="1" visible="no" active="yes"/>
+<layer number="26" name="bNames" color="7" fill="1" visible="no" active="yes"/>
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+<layer number="34" name="bFinish" color="6" fill="6" visible="no" active="yes"/>
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+<layer number="45" name="Holes" color="7" fill="1" visible="no" active="yes"/>
+<layer number="46" name="Milling" color="3" fill="1" visible="no" active="yes"/>
+<layer number="47" name="Measures" color="7" fill="1" visible="no" active="yes"/>
+<layer number="48" name="Document" color="7" fill="1" visible="no" active="yes"/>
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+<layer number="59" name="tCarbon" color="7" fill="1" visible="no" active="no"/>
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+<layer number="89" name="SimProbes" color="9" fill="1" visible="no" active="no"/>
+<layer number="90" name="Modules" color="5" fill="1" visible="no" active="no"/>
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+<layer number="100" name="Muster" color="7" fill="1" visible="no" active="no"/>
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+<layer number="111" name="LPC17xx" color="7" fill="1" visible="no" active="yes"/>
+<layer number="112" name="tSilk" color="7" fill="1" visible="no" active="yes"/>
+<layer number="113" name="IDFDebug" color="7" fill="1" visible="no" active="yes"/>
+<layer number="114" name="Badge_Outline" color="7" fill="1" visible="no" active="yes"/>
+<layer number="115" name="ReferenceISLANDS" color="7" fill="1" visible="no" active="yes"/>
+<layer number="116" name="Patch_BOT" color="9" fill="4" visible="no" active="yes"/>
+<layer number="117" name="BACKMAAT1" color="7" fill="1" visible="no" active="yes"/>
+<layer number="118" name="Rect_Pads" color="7" fill="1" visible="no" active="yes"/>
+<layer number="119" name="KAP_TEKEN" color="7" fill="1" visible="no" active="yes"/>
+<layer number="120" name="KAP_MAAT1" color="7" fill="1" visible="no" active="yes"/>
+<layer number="121" name="_tsilk" color="7" fill="1" visible="no" active="yes"/>
+<layer number="122" name="_bsilk" color="7" fill="1" visible="no" active="yes"/>
+<layer number="123" name="tTestmark" color="7" fill="1" visible="no" active="yes"/>
+<layer number="124" name="bTestmark" color="7" fill="1" visible="no" active="yes"/>
+<layer number="125" name="_tNames" color="7" fill="1" visible="no" active="yes"/>
+<layer number="126" name="_bNames" color="7" fill="1" visible="no" active="yes"/>
+<layer number="127" name="_tValues" color="7" fill="1" visible="no" active="yes"/>
+<layer number="128" name="_bValues" color="7" fill="1" visible="no" active="yes"/>
+<layer number="129" name="Mask" color="7" fill="1" visible="no" active="yes"/>
+<layer number="130" name="SMDSTROOK" color="7" fill="1" visible="no" active="yes"/>
+<layer number="131" name="tAdjust" color="7" fill="1" visible="no" active="yes"/>
+<layer number="132" name="bAdjust" color="7" fill="1" visible="no" active="yes"/>
+<layer number="133" name="bottom_silk" color="7" fill="1" visible="no" active="yes"/>
+<layer number="144" name="Drill_legend" color="7" fill="1" visible="no" active="yes"/>
+<layer number="150" name="Notes" color="7" fill="1" visible="no" active="yes"/>
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+<layer number="153" name="FabDoc1" color="7" fill="1" visible="no" active="yes"/>
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+</layers>
+<board>
+<plain>
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+</package>
+</packages>
+</library>
+<library name="fab">
+<packages>
+<package name="SOIC14">
+<description>&lt;b&gt;Small Outline Package&lt;/b&gt;</description>
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+<rectangle x1="-0.1778" y1="-2.8575" x2="0.1778" y2="-1.8415" layer="51"/>
+<rectangle x1="-1.4478" y1="-2.8575" x2="-1.0922" y2="-1.8415" layer="51"/>
+<rectangle x1="-2.7178" y1="-2.8575" x2="-2.3622" y2="-1.8415" layer="51"/>
+<rectangle x1="-3.9878" y1="-2.8575" x2="-3.6322" y2="-1.8415" layer="51"/>
+</package>
+<package name="2X03SMD">
+<smd name="1" x="-2.54" y="2.54" dx="2.54" dy="1.27" layer="1"/>
+<smd name="3" x="-2.54" y="0" dx="2.54" dy="1.27" layer="1"/>
+<smd name="5" x="-2.54" y="-2.54" dx="2.54" dy="1.27" layer="1"/>
+<smd name="2" x="2.92" y="2.54" dx="2.54" dy="1.27" layer="1"/>
+<smd name="4" x="2.92" y="0" dx="2.54" dy="1.27" layer="1"/>
+<smd name="6" x="2.92" y="-2.54" dx="2.54" dy="1.27" layer="1"/>
+<text x="-5.08" y="2.54" size="1.27" layer="27">1</text>
+<text x="-3.81" y="3.81" size="1.27" layer="25">&gt;NAME</text>
+<text x="-3.81" y="-5.08" size="1.27" layer="27">&gt;VALUE</text>
+</package>
+<package name="1X06SMD">
+<smd name="1" x="0" y="6.35" dx="2.54" dy="1.27" layer="1"/>
+<smd name="2" x="0" y="3.81" dx="2.54" dy="1.27" layer="1"/>
+<smd name="3" x="0" y="1.27" dx="2.54" dy="1.27" layer="1"/>
+<smd name="4" x="0" y="-1.27" dx="2.54" dy="1.27" layer="1"/>
+<smd name="5" x="0" y="-3.81" dx="2.54" dy="1.27" layer="1"/>
+<smd name="6" x="0" y="-6.35" dx="2.54" dy="1.27" layer="1"/>
+<text x="-1.905" y="-3.175" size="1.27" layer="25" rot="R90">&gt;NAME</text>
+</package>
+<package name="6MM_SWITCH">
+<description>&lt;b&gt;OMRON SWITCH&lt;/b&gt;</description>
+<wire x1="3.302" y1="-0.762" x2="3.048" y2="-0.762" width="0.1524" layer="21"/>
+<wire x1="3.302" y1="-0.762" x2="3.302" y2="0.762" width="0.1524" layer="21"/>
+<wire x1="3.048" y1="0.762" x2="3.302" y2="0.762" width="0.1524" layer="21"/>
+<wire x1="3.048" y1="1.016" x2="3.048" y2="2.54" width="0.1524" layer="51"/>
+<wire x1="-3.302" y1="0.762" x2="-3.048" y2="0.762" width="0.1524" layer="21"/>
+<wire x1="-3.302" y1="0.762" x2="-3.302" y2="-0.762" width="0.1524" layer="21"/>
+<wire x1="-3.048" y1="-0.762" x2="-3.302" y2="-0.762" width="0.1524" layer="21"/>
+<wire x1="3.048" y1="2.54" x2="2.54" y2="3.048" width="0.1524" layer="51"/>
+<wire x1="2.54" y1="-3.048" x2="3.048" y2="-2.54" width="0.1524" layer="51"/>
+<wire x1="3.048" y1="-2.54" x2="3.048" y2="-1.016" width="0.1524" layer="51"/>
+<wire x1="-2.54" y1="3.048" x2="-3.048" y2="2.54" width="0.1524" layer="51"/>
+<wire x1="-3.048" y1="2.54" x2="-3.048" y2="1.016" width="0.1524" layer="51"/>
+<wire x1="-2.54" y1="-3.048" x2="-3.048" y2="-2.54" width="0.1524" layer="51"/>
+<wire x1="-3.048" y1="-2.54" x2="-3.048" y2="-1.016" width="0.1524" layer="51"/>
+<wire x1="-1.27" y1="1.27" x2="-1.27" y2="-1.27" width="0.0508" layer="51"/>
+<wire x1="1.27" y1="-1.27" x2="-1.27" y2="-1.27" width="0.0508" layer="51"/>
+<wire x1="1.27" y1="-1.27" x2="1.27" y2="1.27" width="0.0508" layer="51"/>
+<wire x1="-1.27" y1="1.27" x2="1.27" y2="1.27" width="0.0508" layer="51"/>
+<wire x1="-1.27" y1="3.048" x2="-1.27" y2="2.794" width="0.0508" layer="21"/>
+<wire x1="1.27" y1="2.794" x2="-1.27" y2="2.794" width="0.0508" layer="21"/>
+<wire x1="1.27" y1="2.794" x2="1.27" y2="3.048" width="0.0508" layer="21"/>
+<wire x1="1.143" y1="-2.794" x2="-1.27" y2="-2.794" width="0.0508" layer="21"/>
+<wire x1="1.143" y1="-2.794" x2="1.143" y2="-3.048" width="0.0508" layer="21"/>
+<wire x1="-1.27" y1="-2.794" x2="-1.27" y2="-3.048" width="0.0508" layer="21"/>
+<wire x1="2.54" y1="-3.048" x2="2.159" y2="-3.048" width="0.1524" layer="51"/>
+<wire x1="-2.54" y1="-3.048" x2="-2.159" y2="-3.048" width="0.1524" layer="51"/>
+<wire x1="-2.159" y1="-3.048" x2="-1.27" y2="-3.048" width="0.1524" layer="21"/>
+<wire x1="-2.54" y1="3.048" x2="-2.159" y2="3.048" width="0.1524" layer="51"/>
+<wire x1="2.54" y1="3.048" x2="2.159" y2="3.048" width="0.1524" layer="51"/>
+<wire x1="2.159" y1="3.048" x2="1.27" y2="3.048" width="0.1524" layer="21"/>
+<wire x1="1.27" y1="3.048" x2="-1.27" y2="3.048" width="0.1524" layer="21"/>
+<wire x1="-1.27" y1="3.048" x2="-2.159" y2="3.048" width="0.1524" layer="21"/>
+<wire x1="-1.27" y1="-3.048" x2="1.143" y2="-3.048" width="0.1524" layer="21"/>
+<wire x1="1.143" y1="-3.048" x2="2.159" y2="-3.048" width="0.1524" layer="21"/>
+<wire x1="3.048" y1="-0.762" x2="3.048" y2="-1.016" width="0.1524" layer="21"/>
+<wire x1="3.048" y1="0.762" x2="3.048" y2="1.016" width="0.1524" layer="21"/>
+<wire x1="-3.048" y1="-0.762" x2="-3.048" y2="-1.016" width="0.1524" layer="21"/>
+<wire x1="-3.048" y1="0.762" x2="-3.048" y2="1.016" width="0.1524" layer="21"/>
+<wire x1="-1.27" y1="-2.159" x2="1.27" y2="-2.159" width="0.1524" layer="51"/>
+<wire x1="1.27" y1="2.286" x2="-1.27" y2="2.286" width="0.1524" layer="51"/>
+<wire x1="-2.413" y1="1.27" x2="-2.413" y2="0.508" width="0.1524" layer="51"/>
+<wire x1="-2.413" y1="-0.508" x2="-2.413" y2="-1.27" width="0.1524" layer="51"/>
+<wire x1="-2.413" y1="0.508" x2="-2.159" y2="-0.381" width="0.1524" layer="51"/>
+<circle x="0" y="0" radius="1.778" width="0.1524" layer="21"/>
+<circle x="-2.159" y="-2.159" radius="0.508" width="0.1524" layer="51"/>
+<circle x="2.159" y="-2.032" radius="0.508" width="0.1524" layer="51"/>
+<circle x="2.159" y="2.159" radius="0.508" width="0.1524" layer="51"/>
+<circle x="-2.159" y="2.159" radius="0.508" width="0.1524" layer="51"/>
+<circle x="0" y="0" radius="0.635" width="0.0508" layer="51"/>
+<circle x="0" y="0" radius="0.254" width="0.1524" layer="21"/>
+<smd name="1" x="-3.302" y="2.286" dx="2.286" dy="1.524" layer="1"/>
+<smd name="2" x="3.302" y="2.286" dx="2.286" dy="1.524" layer="1"/>
+<smd name="3" x="-3.302" y="-2.286" dx="2.286" dy="1.524" layer="1"/>
+<smd name="4" x="3.302" y="-2.286" dx="2.286" dy="1.524" layer="1"/>
+<text x="-3.048" y="3.683" size="1.27" layer="25" ratio="10">&gt;NAME</text>
+<text x="-3.048" y="-5.08" size="1.27" layer="27" ratio="10">&gt;VALUE</text>
+<text x="-4.318" y="1.651" size="1.27" layer="51" ratio="10">1</text>
+<text x="3.556" y="1.524" size="1.27" layer="51" ratio="10">2</text>
+<text x="-4.572" y="-2.794" size="1.27" layer="51" ratio="10">3</text>
+<text x="3.556" y="-2.794" size="1.27" layer="51" ratio="10">4</text>
+</package>
+<package name="LED1206">
+<description>LED 1206 pads (standard pattern)</description>
+<wire x1="0.9525" y1="-0.8128" x2="-0.9652" y2="-0.8128" width="0.1524" layer="51"/>
+<wire x1="0.9525" y1="0.8128" x2="-0.9652" y2="0.8128" width="0.1524" layer="51"/>
+<wire x1="-2.473" y1="0.983" x2="2.473" y2="0.983" width="0.0508" layer="39"/>
+<wire x1="2.473" y1="0.983" x2="2.473" y2="-0.983" width="0.0508" layer="39"/>
+<wire x1="2.473" y1="-0.983" x2="-2.473" y2="-0.983" width="0.0508" layer="39"/>
+<wire x1="-2.473" y1="-0.983" x2="-2.473" y2="0.983" width="0.0508" layer="39"/>
+<smd name="2" x="1.422" y="0" dx="1.6" dy="1.803" layer="1"/>
+<smd name="1" x="-1.422" y="0" dx="1.6" dy="1.803" layer="1"/>
+<text x="-1.27" y="1.27" size="1.27" layer="25">&gt;NAME</text>
+<text x="-1.27" y="-2.54" size="1.27" layer="27">&gt;VALUE</text>
+<rectangle x1="-1.6891" y1="-0.8763" x2="-0.9525" y2="0.8763" layer="51"/>
+<rectangle x1="0.9525" y1="-0.8763" x2="1.6891" y2="0.8763" layer="51"/>
+</package>
+</packages>
+</library>
+</libraries>
+<attributes>
+</attributes>
+<variantdefs>
+</variantdefs>
+<classes>
+<class number="0" name="default" width="0" drill="0">
+</class>
+</classes>
+<designrules name="fabcity-designrules">
+<description language="de">&lt;b&gt;EAGLE Design Rules&lt;/b&gt;
+&lt;p&gt;
+Die Standard-Design-Rules sind so gewählt, dass sie für 
+die meisten Anwendungen passen. Sollte ihre Platine 
+besondere Anforderungen haben, treffen Sie die erforderlichen
+Einstellungen hier und speichern die Design Rules unter 
+einem neuen Namen ab.</description>
+<description language="en">&lt;b&gt;EAGLE Design Rules&lt;/b&gt;
+&lt;p&gt;
+The default Design Rules have been set to cover
+a wide range of applications. Your particular design
+may have different requirements, so please make the
+necessary adjustments and save your customized
+design rules under a new name.</description>
+<param name="layerSetup" value="(1*16)"/>
+<param name="mtCopper" value="0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm 0.035mm"/>
+<param name="mtIsolate" value="1.5mm 0.15mm 0.2mm 0.15mm 0.2mm 0.15mm 0.2mm 0.15mm 0.2mm 0.15mm 0.2mm 0.15mm 0.2mm 0.15mm 0.2mm"/>
+<param name="mdWireWire" value="16mil"/>
+<param name="mdWirePad" value="16mil"/>
+<param name="mdWireVia" value="16mil"/>
+<param name="mdPadPad" value="16mil"/>
+<param name="mdPadVia" value="16mil"/>
+<param name="mdViaVia" value="16mil"/>
+<param name="mdSmdPad" value="6mil"/>
+<param name="mdSmdVia" value="6mil"/>
+<param name="mdSmdSmd" value="6mil"/>
+<param name="mdViaViaSameLayer" value="6mil"/>
+<param name="mnLayersViaInSmd" value="2"/>
+<param name="mdCopperDimension" value="16mil"/>
+<param name="mdDrill" value="16mil"/>
+<param name="mdSmdStop" value="0mil"/>
+<param name="msWidth" value="10mil"/>
+<param name="msDrill" value="32mil"/>
+<param name="msMicroVia" value="9.99mm"/>
+<param name="msBlindViaRatio" value="0.5"/>
+<param name="rvPadTop" value="0.25"/>
+<param name="rvPadInner" value="0.25"/>
+<param name="rvPadBottom" value="0.25"/>
+<param name="rvViaOuter" value="0.25"/>
+<param name="rvViaInner" value="0.25"/>
+<param name="rvMicroViaOuter" value="0.25"/>
+<param name="rvMicroViaInner" value="0.25"/>
+<param name="rlMinPadTop" value="10mil"/>
+<param name="rlMaxPadTop" value="20mil"/>
+<param name="rlMinPadInner" value="10mil"/>
+<param name="rlMaxPadInner" value="20mil"/>
+<param name="rlMinPadBottom" value="10mil"/>
+<param name="rlMaxPadBottom" value="20mil"/>
+<param name="rlMinViaOuter" value="8mil"/>
+<param name="rlMaxViaOuter" value="20mil"/>
+<param name="rlMinViaInner" value="8mil"/>
+<param name="rlMaxViaInner" value="20mil"/>
+<param name="rlMinMicroViaOuter" value="4mil"/>
+<param name="rlMaxMicroViaOuter" value="20mil"/>
+<param name="rlMinMicroViaInner" value="4mil"/>
+<param name="rlMaxMicroViaInner" value="20mil"/>
+<param name="psTop" value="-1"/>
+<param name="psBottom" value="-1"/>
+<param name="psFirst" value="-1"/>
+<param name="psElongationLong" value="100"/>
+<param name="psElongationOffset" value="100"/>
+<param name="mvStopFrame" value="1"/>
+<param name="mvCreamFrame" value="0"/>
+<param name="mlMinStopFrame" value="4mil"/>
+<param name="mlMaxStopFrame" value="4mil"/>
+<param name="mlMinCreamFrame" value="0mil"/>
+<param name="mlMaxCreamFrame" value="0mil"/>
+<param name="mlViaStopLimit" value="0mil"/>
+<param name="srRoundness" value="0"/>
+<param name="srMinRoundness" value="0mil"/>
+<param name="srMaxRoundness" value="0mil"/>
+<param name="slThermalIsolate" value="16mil"/>
+<param name="slThermalsForVias" value="0"/>
+<param name="dpMaxLengthDifference" value="10mm"/>
+<param name="dpGapFactor" value="2.5"/>
+<param name="checkAngle" value="0"/>
+<param name="checkFont" value="1"/>
+<param name="checkRestrict" value="1"/>
+<param name="checkStop" value="0"/>
+<param name="checkValues" value="0"/>
+<param name="checkNames" value="1"/>
+<param name="checkWireStubs" value="1"/>
+<param name="checkPolygonWidth" value="0"/>
+<param name="useDiameter" value="13"/>
+<param name="maxErrors" value="50"/>
+</designrules>
+<autorouter>
+<pass name="Default">
+<param name="RoutingGrid" value="50mil"/>
+<param name="AutoGrid" value="1"/>
+<param name="Efforts" value="0"/>
+<param name="TopRouterVariant" value="1"/>
+<param name="tpViaShape" value="round"/>
+<param name="PrefDir.1" value="a"/>
+<param name="PrefDir.2" value="0"/>
+<param name="PrefDir.3" value="0"/>
+<param name="PrefDir.4" value="0"/>
+<param name="PrefDir.5" value="0"/>
+<param name="PrefDir.6" value="0"/>
+<param name="PrefDir.7" value="0"/>
+<param name="PrefDir.8" value="0"/>
+<param name="PrefDir.9" value="0"/>
+<param name="PrefDir.10" value="0"/>
+<param name="PrefDir.11" value="0"/>
+<param name="PrefDir.12" value="0"/>
+<param name="PrefDir.13" value="0"/>
+<param name="PrefDir.14" value="0"/>
+<param name="PrefDir.15" value="0"/>
+<param name="PrefDir.16" value="a"/>
+<param name="cfVia" value="8"/>
+<param name="cfNonPref" value="5"/>
+<param name="cfChangeDir" value="2"/>
+<param name="cfOrthStep" value="2"/>
+<param name="cfDiagStep" value="3"/>
+<param name="cfExtdStep" value="0"/>
+<param name="cfBonusStep" value="1"/>
+<param name="cfMalusStep" value="1"/>
+<param name="cfPadImpact" value="4"/>
+<param name="cfSmdImpact" value="4"/>
+<param name="cfBusImpact" value="0"/>
+<param name="cfHugging" value="3"/>
+<param name="cfAvoid" value="4"/>
+<param name="cfPolygon" value="10"/>
+<param name="cfBase.1" value="0"/>
+<param name="cfBase.2" value="1"/>
+<param name="cfBase.3" value="1"/>
+<param name="cfBase.4" value="1"/>
+<param name="cfBase.5" value="1"/>
+<param name="cfBase.6" value="1"/>
+<param name="cfBase.7" value="1"/>
+<param name="cfBase.8" value="1"/>
+<param name="cfBase.9" value="1"/>
+<param name="cfBase.10" value="1"/>
+<param name="cfBase.11" value="1"/>
+<param name="cfBase.12" value="1"/>
+<param name="cfBase.13" value="1"/>
+<param name="cfBase.14" value="1"/>
+<param name="cfBase.15" value="1"/>
+<param name="cfBase.16" value="0"/>
+<param name="mnVias" value="20"/>
+<param name="mnSegments" value="9999"/>
+<param name="mnExtdSteps" value="9999"/>
+<param name="mnRipupLevel" value="10"/>
+<param name="mnRipupSteps" value="100"/>
+<param name="mnRipupTotal" value="100"/>
+</pass>
+<pass name="Follow-me" refer="Default" active="yes">
+</pass>
+<pass name="Busses" refer="Default" active="yes">
+<param name="cfNonPref" value="4"/>
+<param name="cfBusImpact" value="4"/>
+<param name="cfHugging" value="0"/>
+<param name="mnVias" value="0"/>
+</pass>
+<pass name="Route" refer="Default" active="yes">
+</pass>
+<pass name="Optimize1" refer="Default" active="yes">
+<param name="cfVia" value="99"/>
+<param name="cfExtdStep" value="10"/>
+<param name="cfHugging" value="1"/>
+<param name="mnExtdSteps" value="1"/>
+<param name="mnRipupLevel" value="0"/>
+</pass>
+<pass name="Optimize2" refer="Optimize1" active="yes">
+<param name="cfNonPref" value="0"/>
+<param name="cfChangeDir" value="6"/>
+<param name="cfExtdStep" value="0"/>
+<param name="cfBonusStep" value="2"/>
+<param name="cfMalusStep" value="2"/>
+<param name="cfPadImpact" value="2"/>
+<param name="cfSmdImpact" value="2"/>
+<param name="cfHugging" value="0"/>
+</pass>
+<pass name="Optimize3" refer="Optimize2" active="yes">
+<param name="cfChangeDir" value="8"/>
+<param name="cfPadImpact" value="0"/>
+<param name="cfSmdImpact" value="0"/>
+</pass>
+<pass name="Optimize4" refer="Optimize3" active="yes">
+<param name="cfChangeDir" value="25"/>
+</pass>
+</autorouter>
+<elements>
+<element name="C1" library="passives" package="1206" value="1uF" x="29.972" y="40.894" rot="R90">
+<attribute name="PACKAGE" value="1206" x="29.972" y="40.894" size="1.778" layer="27" rot="R90" display="off"/>
+<attribute name="TYPE" value="" x="29.972" y="40.894" size="1.778" layer="27" rot="R90" display="off"/>
+<attribute name="VOLTAGE" value="" x="29.972" y="40.894" size="1.778" layer="27" rot="R90" display="off"/>
+</element>
+<element name="IC1" library="fab" package="SOIC14" value="ATTINY44-SSU" x="27.178" y="33.02" rot="R270"/>
+<element name="R1" library="passives" package="1206" value="10k" x="26.162" y="40.894" rot="R270">
+<attribute name="PACKAGE" value="1206" x="26.162" y="40.894" size="1.778" layer="27" rot="R270" display="off"/>
+<attribute name="PRECISION" value="" x="26.162" y="40.894" size="1.778" layer="27" rot="R270" display="off"/>
+</element>
+<element name="U$1" library="fab" package="2X03SMD" value="AVRISPSMD" x="32.004" y="22.606" rot="R270"/>
+<element name="U$2" library="fab" package="1X06SMD" value="FTDI-SMD-HEADER" x="34.036" y="36.068"/>
+<element name="Y1" library="passives" package="RES_EFOBM" value="RESONATOR" x="21.082" y="41.148" rot="R90"/>
+<element name="S1" library="fab" package="6MM_SWITCH" value="" x="21.844" y="22.86"/>
+<element name="U$3" library="fab" package="LED1206" value="LED" x="19.8628" y="30.48" rot="R270"/>
+<element name="R2" library="passives" package="1206" value="500" x="19.8628" y="35.814" rot="R90">
+<attribute name="PACKAGE" value="1206" x="19.8628" y="35.814" size="1.778" layer="27" rot="R90" display="off"/>
+<attribute name="PRECISION" value="" x="19.8628" y="35.814" size="1.778" layer="27" rot="R90" display="off"/>
+</element>
+</elements>
+<signals>
+<signal name="GND">
+<contactref element="IC1" pad="14"/>
+<contactref element="C1" pad="2"/>
+<contactref element="U$2" pad="1"/>
+<contactref element="Y1" pad="2"/>
+<contactref element="U$1" pad="6"/>
+<contactref element="U$3" pad="2"/>
+<contactref element="S1" pad="3"/>
+<contactref element="S1" pad="4"/>
+<polygon width="0.1524" layer="1" isolate="0.508">
+<vertex x="39.624" y="48.26"/>
+<vertex x="39.624" y="14.732"/>
+<vertex x="14.224" y="14.732"/>
+<vertex x="14.224" y="48.26"/>
+</polygon>
+</signal>
+<signal name="N$2">
+<contactref element="R1" pad="2"/>
+<contactref element="U$1" pad="5"/>
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+</signals>
+<mfgpreviewcolors>
+<mfgpreviewcolor name="soldermaskcolor" color="0xC8008000"/>
+<mfgpreviewcolor name="silkscreencolor" color="0xFFFEFEFE"/>
+<mfgpreviewcolor name="backgroundcolor" color="0xFF282828"/>
+<mfgpreviewcolor name="coppercolor" color="0xFFFFBF00"/>
+<mfgpreviewcolor name="substratecolor" color="0xFF786E46"/>
+</mfgpreviewcolors>
+</board>
+</drawing>
+</eagle>
diff --git a/static/designs/06_echo.sch b/static/designs/06_echo.sch
new file mode 100644
index 0000000000000000000000000000000000000000..60f30b6fc569dee08f52bf3cff9fad463c3ed840
--- /dev/null
+++ b/static/designs/06_echo.sch
@@ -0,0 +1,1448 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE eagle SYSTEM "eagle.dtd">
+<eagle version="9.1.3">
+<drawing>
+<settings>
+<setting alwaysvectorfont="no"/>
+<setting verticaltext="up"/>
+</settings>
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+</deviceset>
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+<description>LED</description>
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+<devices>
+<device name="" package="LED1206">
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+<device name="FAB1206" package="LED1206FAB">
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+<wire x1="5.08" y1="2.54" x2="5.08" y2="0" width="0.254" layer="94"/>
+<wire x1="5.08" y1="0" x2="5.08" y2="-5.08" width="0.254" layer="94"/>
+<wire x1="5.08" y1="-5.08" x2="0" y2="-5.08" width="0.254" layer="94"/>
+<wire x1="0" y1="-5.08" x2="-5.08" y2="-5.08" width="0.254" layer="94"/>
+<wire x1="-5.08" y1="-5.08" x2="-5.08" y2="0" width="0.254" layer="94"/>
+<wire x1="-5.08" y1="0" x2="-5.08" y2="2.54" width="0.254" layer="94"/>
+<wire x1="-5.08" y1="0" x2="-3.81" y2="0" width="0.1524" layer="94"/>
+<wire x1="-3.81" y1="0" x2="-1.27" y2="0" width="0.1524" layer="94"/>
+<wire x1="-1.27" y1="0" x2="-1.27" y2="1.27" width="0.1524" layer="94"/>
+<wire x1="-1.27" y1="0" x2="-1.27" y2="-1.27" width="0.1524" layer="94"/>
+<wire x1="-0.508" y1="1.27" x2="-0.508" y2="-1.27" width="0.1524" layer="94"/>
+<wire x1="-0.508" y1="-1.27" x2="0.508" y2="-1.27" width="0.1524" layer="94"/>
+<wire x1="0.508" y1="-1.27" x2="0.508" y2="1.27" width="0.1524" layer="94"/>
+<wire x1="0.508" y1="1.27" x2="-0.508" y2="1.27" width="0.1524" layer="94"/>
+<wire x1="1.27" y1="1.27" x2="1.27" y2="0" width="0.1524" layer="94"/>
+<wire x1="1.27" y1="0" x2="1.27" y2="-1.27" width="0.1524" layer="94"/>
+<wire x1="1.27" y1="0" x2="3.81" y2="0" width="0.1524" layer="94"/>
+<wire x1="3.81" y1="0" x2="5.08" y2="0" width="0.1524" layer="94"/>
+<wire x1="0" y1="-5.08" x2="0" y2="-3.302" width="0.1524" layer="94"/>
+<wire x1="0" y1="-3.302" x2="-1.778" y2="-3.302" width="0.1524" layer="94"/>
+<wire x1="0" y1="-3.302" x2="1.778" y2="-3.302" width="0.1524" layer="94"/>
+<wire x1="1.778" y1="-2.286" x2="1.778" y2="-4.318" width="0.1524" layer="94"/>
+<wire x1="2.54" y1="-2.286" x2="2.54" y2="-3.302" width="0.1524" layer="94"/>
+<wire x1="2.54" y1="-3.302" x2="2.54" y2="-4.318" width="0.1524" layer="94"/>
+<wire x1="2.54" y1="-3.302" x2="3.81" y2="-3.302" width="0.1524" layer="94"/>
+<wire x1="3.81" y1="-3.302" x2="3.81" y2="0" width="0.1524" layer="94"/>
+<wire x1="-1.778" y1="-2.286" x2="-1.778" y2="-4.318" width="0.1524" layer="94"/>
+<wire x1="-2.54" y1="-2.286" x2="-2.54" y2="-3.302" width="0.1524" layer="94"/>
+<wire x1="-2.54" y1="-3.302" x2="-2.54" y2="-4.318" width="0.1524" layer="94"/>
+<wire x1="-2.54" y1="-3.302" x2="-3.81" y2="-3.302" width="0.1524" layer="94"/>
+<wire x1="-3.81" y1="-3.302" x2="-3.81" y2="0" width="0.1524" layer="94"/>
+<circle x="-3.81" y="0" radius="0.254" width="0" layer="94"/>
+<circle x="3.81" y="0" radius="0.254" width="0" layer="94"/>
+<circle x="0" y="-3.302" radius="0.254" width="0" layer="94"/>
+<text x="-5.08" y="3.81" size="1.778" layer="95">&gt;NAME</text>
+<text x="2.54" y="-7.62" size="1.778" layer="96">&gt;VALUE</text>
+<pin name="1" x="-7.62" y="0" visible="pad" length="short" direction="pas"/>
+<pin name="2" x="0" y="-7.62" visible="pad" length="short" direction="pas" rot="R90"/>
+<pin name="3" x="7.62" y="0" visible="pad" length="short" direction="pas" rot="R180"/>
+</symbol>
+</symbols>
+<devicesets>
+<deviceset name="RESISTOR" prefix="R" uservalue="yes">
+<description>&lt;b&gt;Resistor&lt;/b&gt;
+Basic schematic elements and footprints for 0603, 1206, and PTH resistors.</description>
+<gates>
+<gate name="G$1" symbol="RESISTOR" x="0" y="0"/>
+</gates>
+<devices>
+<device name="1206" package="1206">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="1206" constant="no"/>
+<attribute name="PRECISION" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="2010" package="R2010">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="2010"/>
+<attribute name="PRECISION" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="0805-RES" package="0805">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="0805"/>
+<attribute name="PRECISION" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="0603-RES" package="0603-RES">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="0603"/>
+<attribute name="PRECISION" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="0402-RES" package="0402-RES">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="0402"/>
+<attribute name="PRECISION" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="2512" package="R2512">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="2512"/>
+<attribute name="PRECISION" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="TO220ACS" package="TO220ACS">
+<connects>
+<connect gate="G$1" pin="1" pad="A"/>
+<connect gate="G$1" pin="2" pad="C"/>
+</connects>
+<technologies>
+<technology name=""/>
+</technologies>
+</device>
+</devices>
+</deviceset>
+<deviceset name="CAP" prefix="C" uservalue="yes">
+<description>&lt;b&gt;Capacitor&lt;/b&gt;
+Standard 0603 ceramic capacitor, and 0.1" leaded capacitor.</description>
+<gates>
+<gate name="G$1" symbol="CAP" x="0" y="0"/>
+</gates>
+<devices>
+<device name="0805" package="0805">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="0805"/>
+<attribute name="TYPE" value="" constant="no"/>
+<attribute name="VOLTAGE" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="0603-CAP" package="0603-CAP">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="0603"/>
+<attribute name="TYPE" value="" constant="no"/>
+<attribute name="VOLTAGE" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="0402-CAP" package="0402-CAP">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="0402"/>
+<attribute name="TYPE" value="" constant="no"/>
+<attribute name="VOLTAGE" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="1210" package="1210">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="1210" constant="no"/>
+<attribute name="TYPE" value="" constant="no"/>
+<attribute name="VOLTAGE" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+<device name="1206" package="1206">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+</connects>
+<technologies>
+<technology name="">
+<attribute name="PACKAGE" value="1206" constant="no"/>
+<attribute name="TYPE" value="" constant="no"/>
+<attribute name="VOLTAGE" value="" constant="no"/>
+</technology>
+</technologies>
+</device>
+</devices>
+</deviceset>
+<deviceset name="RESONATOR" prefix="Y">
+<gates>
+<gate name="G$1" symbol="CERAMIC_RESONATOR" x="0" y="0"/>
+</gates>
+<devices>
+<device name="" package="RES_EFOBM">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+<connect gate="G$1" pin="3" pad="3"/>
+</connects>
+<technologies>
+<technology name=""/>
+</technologies>
+</device>
+<device name="PQRC" package="RES_PRQC">
+<connects>
+<connect gate="G$1" pin="1" pad="1"/>
+<connect gate="G$1" pin="2" pad="2"/>
+<connect gate="G$1" pin="3" pad="3"/>
+</connects>
+<technologies>
+<technology name=""/>
+</technologies>
+</device>
+</devices>
+</deviceset>
+</devicesets>
+</library>
+<library name="supply1" urn="urn:adsk.eagle:library:371">
+<description>&lt;b&gt;Supply Symbols&lt;/b&gt;&lt;p&gt;
+ GND, VCC, 0V, +5V, -5V, etc.&lt;p&gt;
+ Please keep in mind, that these devices are necessary for the
+ automatic wiring of the supply signals.&lt;p&gt;
+ The pin name defined in the symbol is identical to the net which is to be wired automatically.&lt;p&gt;
+ In this library the device names are the same as the pin names of the symbols, therefore the correct signal names appear next to the supply symbols in the schematic.&lt;p&gt;
+ &lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
+<packages>
+</packages>
+<symbols>
+<symbol name="GND" urn="urn:adsk.eagle:symbol:26925/1" library_version="1">
+<wire x1="-1.905" y1="0" x2="1.905" y2="0" width="0.254" layer="94"/>
+<text x="-2.54" y="-2.54" size="1.778" layer="96">&gt;VALUE</text>
+<pin name="GND" x="0" y="2.54" visible="off" length="short" direction="sup" rot="R270"/>
+</symbol>
+<symbol name="+3V3" urn="urn:adsk.eagle:symbol:26950/1" library_version="1">
+<wire x1="1.27" y1="-1.905" x2="0" y2="0" width="0.254" layer="94"/>
+<wire x1="0" y1="0" x2="-1.27" y2="-1.905" width="0.254" layer="94"/>
+<text x="-2.54" y="-5.08" size="1.778" layer="96" rot="R90">&gt;VALUE</text>
+<pin name="+3V3" x="0" y="-2.54" visible="off" length="short" direction="sup" rot="R90"/>
+</symbol>
+</symbols>
+<devicesets>
+<deviceset name="GND" urn="urn:adsk.eagle:component:26954/1" prefix="GND" library_version="1">
+<description>&lt;b&gt;SUPPLY SYMBOL&lt;/b&gt;</description>
+<gates>
+<gate name="1" symbol="GND" x="0" y="0"/>
+</gates>
+<devices>
+<device name="">
+<technologies>
+<technology name=""/>
+</technologies>
+</device>
+</devices>
+</deviceset>
+<deviceset name="+3V3" urn="urn:adsk.eagle:component:26981/1" prefix="+3V3" library_version="1">
+<description>&lt;b&gt;SUPPLY SYMBOL&lt;/b&gt;</description>
+<gates>
+<gate name="G$1" symbol="+3V3" x="0" y="0"/>
+</gates>
+<devices>
+<device name="">
+<technologies>
+<technology name=""/>
+</technologies>
+</device>
+</devices>
+</deviceset>
+</devicesets>
+</library>
+</libraries>
+<attributes>
+</attributes>
+<variantdefs>
+</variantdefs>
+<classes>
+<class number="0" name="default" width="0" drill="0">
+</class>
+</classes>
+<parts>
+<part name="IC1" library="fab" deviceset="ATTINY44" device="-SSU"/>
+<part name="R1" library="passives" deviceset="RESISTOR" device="1206" value="10k"/>
+<part name="GND1" library="supply1" library_urn="urn:adsk.eagle:library:371" deviceset="GND" device=""/>
+<part name="C1" library="passives" deviceset="CAP" device="1206" value="1uF"/>
+<part name="U$2" library="fab" deviceset="FTDI-SMD-HEADER" device=""/>
+<part name="Y1" library="passives" deviceset="RESONATOR" device=""/>
+<part name="+3V1" library="supply1" library_urn="urn:adsk.eagle:library:371" deviceset="+3V3" device=""/>
+<part name="GND2" library="supply1" library_urn="urn:adsk.eagle:library:371" deviceset="GND" device=""/>
+<part name="U$1" library="fab" deviceset="AVRISP" device="SMD"/>
+<part name="+3V2" library="supply1" library_urn="urn:adsk.eagle:library:371" deviceset="+3V3" device=""/>
+<part name="S1" library="fab" deviceset="6MM_SWITCH" device="6MM_SWITCH"/>
+<part name="U$3" library="fab" deviceset="LED" device=""/>
+<part name="R2" library="passives" deviceset="RESISTOR" device="1206" value="500"/>
+<part name="GND3" library="supply1" library_urn="urn:adsk.eagle:library:371" deviceset="GND" device=""/>
+<part name="GND4" library="supply1" library_urn="urn:adsk.eagle:library:371" deviceset="GND" device=""/>
+</parts>
+<sheets>
+<sheet>
+<plain>
+</plain>
+<instances>
+<instance part="IC1" gate="1" x="27.94" y="45.72"/>
+<instance part="R1" gate="G$1" x="25.4" y="71.12"/>
+<instance part="GND1" gate="1" x="5.08" y="25.4"/>
+<instance part="C1" gate="G$1" x="15.24" y="35.56"/>
+<instance part="U$2" gate="G$1" x="93.98" y="30.48"/>
+<instance part="Y1" gate="G$1" x="101.6" y="60.96"/>
+<instance part="+3V1" gate="G$1" x="5.08" y="48.26"/>
+<instance part="GND2" gate="1" x="116.84" y="48.26"/>
+<instance part="U$1" gate="G$1" x="99.06" y="76.2"/>
+<instance part="+3V2" gate="G$1" x="116.84" y="83.82"/>
+<instance part="S1" gate="2" x="73.66" y="81.28"/>
+<instance part="U$3" gate="G$1" x="83.82" y="10.16"/>
+<instance part="R2" gate="G$1" x="83.82" y="20.32" rot="R90"/>
+<instance part="GND3" gate="1" x="83.82" y="2.54"/>
+<instance part="GND4" gate="1" x="53.34" y="83.82"/>
+</instances>
+<busses>
+</busses>
+<nets>
+<net name="GND" class="0">
+<segment>
+<pinref part="GND1" gate="1" pin="GND"/>
+<wire x1="5.08" y1="27.94" x2="5.08" y2="30.48" width="0.1524" layer="91"/>
+<pinref part="IC1" gate="1" pin="GND"/>
+<wire x1="5.08" y1="30.48" x2="15.24" y2="30.48" width="0.1524" layer="91"/>
+<pinref part="C1" gate="G$1" pin="2"/>
+<wire x1="15.24" y1="30.48" x2="20.32" y2="30.48" width="0.1524" layer="91"/>
+<wire x1="15.24" y1="33.02" x2="15.24" y2="30.48" width="0.1524" layer="91"/>
+<junction x="15.24" y="30.48"/>
+</segment>
+<segment>
+<pinref part="U$2" gate="G$1" pin="GND"/>
+<wire x1="93.98" y1="43.18" x2="93.98" y2="50.8" width="0.1524" layer="91"/>
+<wire x1="93.98" y1="50.8" x2="101.6" y2="50.8" width="0.1524" layer="91"/>
+<pinref part="Y1" gate="G$1" pin="2"/>
+<wire x1="101.6" y1="50.8" x2="116.84" y2="50.8" width="0.1524" layer="91"/>
+<wire x1="101.6" y1="53.34" x2="101.6" y2="50.8" width="0.1524" layer="91"/>
+<junction x="101.6" y="50.8"/>
+<pinref part="GND2" gate="1" pin="GND"/>
+<pinref part="U$1" gate="G$1" pin="GND"/>
+<wire x1="104.14" y1="73.66" x2="116.84" y2="73.66" width="0.1524" layer="91"/>
+<wire x1="116.84" y1="73.66" x2="116.84" y2="50.8" width="0.1524" layer="91"/>
+<junction x="116.84" y="50.8"/>
+</segment>
+<segment>
+<pinref part="GND3" gate="1" pin="GND"/>
+<pinref part="U$3" gate="G$1" pin="C"/>
+<wire x1="83.82" y1="5.08" x2="83.82" y2="7.62" width="0.1524" layer="91"/>
+</segment>
+<segment>
+<pinref part="S1" gate="2" pin="S"/>
+<wire x1="73.66" y1="86.36" x2="73.66" y2="91.44" width="0.1524" layer="91"/>
+<wire x1="73.66" y1="91.44" x2="53.34" y2="91.44" width="0.1524" layer="91"/>
+<wire x1="53.34" y1="91.44" x2="53.34" y2="86.36" width="0.1524" layer="91"/>
+<pinref part="GND4" gate="1" pin="GND"/>
+<pinref part="S1" gate="2" pin="S1"/>
+<wire x1="76.2" y1="86.36" x2="76.2" y2="91.44" width="0.1524" layer="91"/>
+<wire x1="76.2" y1="91.44" x2="73.66" y2="91.44" width="0.1524" layer="91"/>
+<junction x="73.66" y="91.44"/>
+</segment>
+</net>
+<net name="N$2" class="0">
+<segment>
+<pinref part="R1" gate="G$1" pin="2"/>
+<wire x1="83.82" y1="71.12" x2="30.48" y2="71.12" width="0.1524" layer="91"/>
+<pinref part="U$1" gate="G$1" pin="RST"/>
+<wire x1="96.52" y1="73.66" x2="83.82" y2="73.66" width="0.1524" layer="91"/>
+<wire x1="83.82" y1="73.66" x2="83.82" y2="71.12" width="0.1524" layer="91"/>
+<pinref part="IC1" gate="1" pin="(PCINT11/RESET/DW)PB3"/>
+<wire x1="78.74" y1="60.96" x2="83.82" y2="60.96" width="0.1524" layer="91"/>
+<wire x1="83.82" y1="60.96" x2="83.82" y2="71.12" width="0.1524" layer="91"/>
+<junction x="83.82" y="71.12"/>
+</segment>
+</net>
+<net name="+3V3" class="0">
+<segment>
+<pinref part="+3V1" gate="G$1" pin="+3V3"/>
+<wire x1="5.08" y1="45.72" x2="5.08" y2="43.18" width="0.1524" layer="91"/>
+<pinref part="C1" gate="G$1" pin="1"/>
+<wire x1="15.24" y1="40.64" x2="15.24" y2="43.18" width="0.1524" layer="91"/>
+<pinref part="IC1" gate="1" pin="VCC"/>
+<wire x1="15.24" y1="43.18" x2="20.32" y2="43.18" width="0.1524" layer="91"/>
+<wire x1="15.24" y1="43.18" x2="15.24" y2="71.12" width="0.1524" layer="91"/>
+<junction x="15.24" y="43.18"/>
+<pinref part="R1" gate="G$1" pin="1"/>
+<wire x1="15.24" y1="71.12" x2="20.32" y2="71.12" width="0.1524" layer="91"/>
+<wire x1="5.08" y1="43.18" x2="15.24" y2="43.18" width="0.1524" layer="91"/>
+</segment>
+<segment>
+<pinref part="U$1" gate="G$1" pin="VCC"/>
+<wire x1="104.14" y1="78.74" x2="116.84" y2="78.74" width="0.1524" layer="91"/>
+<pinref part="+3V2" gate="G$1" pin="+3V3"/>
+<wire x1="116.84" y1="81.28" x2="116.84" y2="78.74" width="0.1524" layer="91"/>
+<pinref part="U$2" gate="G$1" pin="VCC"/>
+<wire x1="93.98" y1="38.1" x2="91.44" y2="38.1" width="0.1524" layer="91"/>
+<wire x1="91.44" y1="38.1" x2="91.44" y2="22.86" width="0.1524" layer="91"/>
+<wire x1="91.44" y1="22.86" x2="121.92" y2="22.86" width="0.1524" layer="91"/>
+<wire x1="121.92" y1="22.86" x2="121.92" y2="78.74" width="0.1524" layer="91"/>
+<wire x1="121.92" y1="78.74" x2="116.84" y2="78.74" width="0.1524" layer="91"/>
+<junction x="116.84" y="78.74"/>
+</segment>
+</net>
+<net name="N$1" class="0">
+<segment>
+<pinref part="IC1" gate="1" pin="(PCINT0/AREF/ADC0)PA0"/>
+<wire x1="78.74" y1="30.48" x2="86.36" y2="30.48" width="0.1524" layer="91"/>
+<wire x1="86.36" y1="30.48" x2="86.36" y2="35.56" width="0.1524" layer="91"/>
+<pinref part="U$2" gate="G$1" pin="TXD"/>
+<wire x1="86.36" y1="35.56" x2="93.98" y2="35.56" width="0.1524" layer="91"/>
+</segment>
+</net>
+<net name="N$3" class="0">
+<segment>
+<pinref part="IC1" gate="1" pin="(PCINT1/AIN0/ADC1)PA1"/>
+<pinref part="U$2" gate="G$1" pin="RXD"/>
+<wire x1="78.74" y1="33.02" x2="93.98" y2="33.02" width="0.1524" layer="91"/>
+</segment>
+</net>
+<net name="N$4" class="0">
+<segment>
+<pinref part="IC1" gate="1" pin="(PCINT9/XTAL2)PB1"/>
+<wire x1="78.74" y1="55.88" x2="93.98" y2="55.88" width="0.1524" layer="91"/>
+<wire x1="93.98" y1="55.88" x2="93.98" y2="60.96" width="0.1524" layer="91"/>
+<pinref part="Y1" gate="G$1" pin="1"/>
+</segment>
+</net>
+<net name="N$5" class="0">
+<segment>
+<pinref part="IC1" gate="1" pin="(PCINT8/XTAL1/CLKI)PB0"/>
+<wire x1="78.74" y1="53.34" x2="109.22" y2="53.34" width="0.1524" layer="91"/>
+<pinref part="Y1" gate="G$1" pin="3"/>
+<wire x1="109.22" y1="53.34" x2="109.22" y2="60.96" width="0.1524" layer="91"/>
+</segment>
+</net>
+<net name="N$7" class="0">
+<segment>
+<pinref part="IC1" gate="1" pin="(PCINT6/OC1A/SDA/MOSI/ADC6)PA6"/>
+<wire x1="78.74" y1="45.72" x2="86.36" y2="45.72" width="0.1524" layer="91"/>
+<wire x1="86.36" y1="45.72" x2="86.36" y2="68.58" width="0.1524" layer="91"/>
+<wire x1="86.36" y1="68.58" x2="109.22" y2="68.58" width="0.1524" layer="91"/>
+<wire x1="109.22" y1="68.58" x2="109.22" y2="76.2" width="0.1524" layer="91"/>
+<pinref part="U$1" gate="G$1" pin="MOSI"/>
+<wire x1="109.22" y1="76.2" x2="104.14" y2="76.2" width="0.1524" layer="91"/>
+</segment>
+</net>
+<net name="N$6" class="0">
+<segment>
+<pinref part="IC1" gate="1" pin="(PCINT4/T1/SCL/USCK/ADC4)PA4"/>
+<wire x1="78.74" y1="40.64" x2="91.44" y2="40.64" width="0.1524" layer="91"/>
+<wire x1="91.44" y1="40.64" x2="91.44" y2="76.2" width="0.1524" layer="91"/>
+<pinref part="U$1" gate="G$1" pin="SCK"/>
+<wire x1="91.44" y1="76.2" x2="96.52" y2="76.2" width="0.1524" layer="91"/>
+</segment>
+</net>
+<net name="N$8" class="0">
+<segment>
+<pinref part="IC1" gate="1" pin="(PCINT5/OC1B/MISO/DO/ADC5)PA5"/>
+<wire x1="78.74" y1="43.18" x2="88.9" y2="43.18" width="0.1524" layer="91"/>
+<wire x1="88.9" y1="43.18" x2="88.9" y2="78.74" width="0.1524" layer="91"/>
+<pinref part="U$1" gate="G$1" pin="MISO"/>
+<wire x1="88.9" y1="78.74" x2="96.52" y2="78.74" width="0.1524" layer="91"/>
+</segment>
+</net>
+<net name="N$9" class="0">
+<segment>
+<wire x1="83.82" y1="58.42" x2="83.82" y2="25.4" width="0.1524" layer="91"/>
+<pinref part="R2" gate="G$1" pin="2"/>
+<pinref part="IC1" gate="1" pin="(PCINT10/INT0/OC0A/CKOUT)PB2"/>
+<wire x1="83.82" y1="58.42" x2="78.74" y2="58.42" width="0.1524" layer="91"/>
+</segment>
+</net>
+<net name="N$10" class="0">
+<segment>
+<pinref part="U$3" gate="G$1" pin="A"/>
+<pinref part="R2" gate="G$1" pin="1"/>
+</segment>
+</net>
+<net name="N$11" class="0">
+<segment>
+<pinref part="S1" gate="2" pin="P1"/>
+<wire x1="76.2" y1="76.2" x2="81.28" y2="76.2" width="0.1524" layer="91"/>
+<pinref part="IC1" gate="1" pin="(PCINT7/ICP/OC0B/ADC7)PA7"/>
+<wire x1="78.74" y1="48.26" x2="81.28" y2="48.26" width="0.1524" layer="91"/>
+<wire x1="81.28" y1="48.26" x2="81.28" y2="76.2" width="0.1524" layer="91"/>
+</segment>
+</net>
+</nets>
+</sheet>
+</sheets>
+</schematic>
+</drawing>
+<compatibility>
+<note version="8.2" severity="warning">
+Since Version 8.2, EAGLE supports online libraries. The ids
+of those online libraries will not be understood (or retained)
+with this version.
+</note>
+<note version="8.3" severity="warning">
+Since Version 8.3, EAGLE supports URNs for individual library
+assets (packages, symbols, and devices). The URNs of those assets
+will not be understood (or retained) with this version.
+</note>
+</compatibility>
+</eagle>
diff --git a/static/designs/06_echo_cutout.png b/static/designs/06_echo_cutout.png
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diff --git a/static/img/06_board.png b/static/img/06_board.png
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diff --git a/static/img/06_let_there_be_bits.png b/static/img/06_let_there_be_bits.png
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