Commit 2a51fb74 authored by Jake Read's avatar Jake Read
Browse files

adding video

parent 5d06c533
......@@ -24,6 +24,15 @@ At a bare minimum, you're going to be hooking these things up to power, and to e
- don't forget to check polarity before you power up
- network cables can be made two ways: only one is correct - *rj45 tabs should be on the same side of the ribbon cable* i.e. the cable is a 'straight through' type, not a crossover. this means that tx meets rx, etc.
- the transmit / receive ports are RS-485 Differential Driven, meaning there is no common gnd connection between boards besides the power bus.
The connectors I use are called 'RJ45' Jacks and Plugs. These are standard for Ethernet, but also 'generally useful'. This is not ethernet, but these *are* RJ45. It's 8 wires, and in our case that's four differential pairs - two duplex lines on each side.
One cool thing about RJ45 is the modularity of the cables. We can use commodity crimping tools to make our own lengths:
![rj45 video](images/rj45-assembly.mp4)
```make sure those tabs are on the same side of the flat cable```
![rj45](images/rj45-tabs.jpg)
......
......@@ -44,20 +44,4 @@ To load a program onto the device, connect the programmer (in this case, I'm usi
If you get an error saying you don't have a tool connected, hit OK and select the Atmel-ICE from the menu that appears. Otherwise, to set up a programming tool in Atmel Studio go to 'Tools -> Device Programming' or right-click on the solution and open the properties. From there you can select a tool in the 'Tool' tab on the left.
If it programs, you will probably see the 'STL' light start to flash. Good news!
## Circuit Building
Each AutomataKit project includes circuit schematic and board files, as well as some notes (if I've been feeling verbose) under the /circuit directory, and should include a BOM.
Circuit Manufacturing is practically a commodity these days. I use [JLCPCB](https://jlcpcb.com/) in Shenzhen, and [OHS Park](https://oshpark.com/) is popular among the open source community. On both of these websites, you can drop the .zip folder from a projects' /circuit folder into their quoting system and get an estimate for cost. Normally, you can get 5 boards for $10 or so, OHS Park may be more expensive (also more awesome, and purple). Boards typically arrive in one week. I highly recommend also ordering a solder stencil.
To assemble circuits, you'll have to order parts as well, I use [DigiKey](https://www.digikey.com/), which is easy for you because I'll include DigiKey Part Numbers on my BOMs.
For final assembly, I recommend a readthrough of [sparkfun's documentation](https://learn.sparkfun.com/tutorials/electronics-assembly) or [adafruit's documentation](https://learn.adafruit.com/smt-manufacturing?view=all#overview)
Essentially, when boards arrive with a stencil, you can solder-paste squeegee paste onto the boards. While some people use a jig for this, in small volumes it's totally reasonable to do by hand (make sure you get a stencil with a 'framework'). Of course, you can also use a syringe of paste and dot each component off individually, but stencils seem like the way to go.
Then, find an old microscope (or don't, and squint!) and tweezer the components into place. This isn't as hard as you'd think, as the melting solder paste surface-tensions everything into the right alignment.
Now, you'll also need (or want) a reflow oven. I used the [controleo](http://www.whizoo.com/) to convert a toaster oven into a reflow oven. If you or your fab-community is not stoked about investing too much time into this, you can also do some [frying-pan reflow](https://www.youtube.com/watch?v=3drirgNktQg).
If it programs, you will probably see the 'STL' light start to flash. Good news!
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