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# digital-driver
A photoreactor driver board designed to be controlled digitally over I2C.
## PCB
This PCB was designed using KiCAD version 5.
Refer to `driver.pdf` for schematic.
PCB images generated with [tracespace](https://github.com/tracespace/tracespace) follow.
<img src="./driver-.top.svg" width="100%"/>
<img src="./driver-.bottom.svg" width="100%"/>
Bill of Materials
| reference | value | manufacturer | part number | DigiKey | Newark |
| :------------- | :------------ | :----------- | :---------- | :------ | :----- |
| C2 | 10u | | | | |
| C3 | 22u | | | | |
| D1 | (red) | | | | |
| D2 | (blue) | | | | |
| J1, J2 | | | | | |
| J3, J4 | | | | | |
| J5 | fan connector | | | | |
| J7 | LED connector | | | | |
| PS1 | | | | | |
| R1, R4, R6, R7 | | | | | |
| R2, R5 | | | | | |
| U1 | | | | | |
| U2 | | | | | |
## I2C Interface
DOCUMENTATION TODO
## Firmware
Find in "firmware" folder.
Use Arduino IDE.
We programmed the ATtiny85 using the sparkfun Tiny AVR Programmer: [PGM-11801](https://www.sparkfun.com/products/11801).
## Changelog
### Unprinted
#### Changed
- removed wisconsin crest logo
### Revision B
#### Fixed
- silk screen polarity markings for LED
- backwards I2C connectors
### Revision A
#### Added
- initial design
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