Commit f9b40a08 authored by Jake Read's avatar Jake Read
Browse files

test maths rendering

parent 376494c1
jake/
**.elf
**.hex
**.bin
**.lss
**.map
**.srec
**.o
**.d
**.DS_Store
**.b#*
**.s#*
**/ASF/
js/node_modules/
sim/js_code.txt
sim/TinyNets/nbproject/
\ No newline at end of file
......@@ -16,9 +16,15 @@ In short, these solutions seem cool, but complicated, and I need to take some mo
- adc resolution -> bar width / spacing
- grounding, stack setup, tx pads, rx pad(s)?
## Understanding the Phenomenon
It's good to try to get a grounding on what's really going on. To get the basics in order, I go [here](http://hyperphysics.phy-astr.gsu.edu/hbase/electric/pplate.html).
Capacitance is $C = \frac{k * e * A}{d}$ where $k$ is the relative permittivity of the material between the plates, $e$ is a constant making $k * e = 1$ in air, $A$ is the area of the plates and $d$ is the separation of those plates.
Some quick thoughts
- do static tx / rx pads. reference is metallic thing that moves between them, changing the permeability of space between them
- bc capacitance is C = \frac{k * e * A}{d} where E is constant, A is area, and K is relative permeability (k ~= 1 for air)
- do static tx / rx pads. reference is metallic thing that moves between them, changing the permeattivity of space between them
- bc capacitance is C = \frac{k * e * A}{d} where E is constant, A is area, and K is relative permeattivity (k ~= 1 for air)
- 'metallic thing' can be double-sided pcb w/ sawtooth or sine pattern to read
- can do spreadsheet maths for tx / rx areas, see what total capacitance range will be (1pf -> 15pf?)
- can figure apparent rise-time calculator, probably?
......
......@@ -353,10 +353,10 @@ UsedLibrary="D:/Dropbox (Personal)/CBA/doc/libraries/eagle/fab.lbr"
[Win_1]
Type="Control Panel"
Loc="0 0 3839 2065"
Loc="0 0 1919 1016"
State=1
Number=0
[Desktop]
Screen="3840 2160"
Screen="1920 2160"
Window="Win_1"
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="8.3.2">
<drawing>
<settings>
<setting alwaysvectorfont="no"/>
<setting verticaltext="up"/>
</settings>
<grid distance="0.1" unitdist="inch" unit="inch" style="lines" multiple="1" display="no" altdistance="0.01" altunitdist="inch" altunit="inch"/>
<layers>
<layer number="90" name="Modules" color="5" fill="1" visible="yes" active="yes"/>
<layer number="91" name="Nets" color="2" fill="1" visible="yes" active="yes"/>
<layer number="92" name="Busses" color="1" fill="1" visible="yes" active="yes"/>
<layer number="93" name="Pins" color="2" fill="1" visible="no" active="yes"/>
<layer number="94" name="Symbols" color="4" fill="1" visible="yes" active="yes"/>
<layer number="95" name="Names" color="7" fill="1" visible="yes" active="yes"/>
<layer number="96" name="Values" color="7" fill="1" visible="yes" active="yes"/>
<layer number="97" name="Info" color="7" fill="1" visible="yes" active="yes"/>
<layer number="98" name="Guide" color="6" fill="1" visible="yes" active="yes"/>
</layers>
<schematic xreflabel="%F%N/%S.%C%R" xrefpart="/%S.%C%R">
<libraries>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<classes>
<class number="0" name="default" width="0" drill="0">
</class>
</classes>
<parts>
</parts>
<sheets>
<sheet>
<plain>
</plain>
<instances>
</instances>
<busses>
</busses>
<nets>
</nets>
</sheet>
</sheets>
</schematic>
</drawing>
</eagle>
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