Updates since 27 AUG 2025

- replaced J8 and J9 (LEFT_ENABLE and RIGHT_ENABLE) with jumpers
- changed SW1 symbol and footprint
- changed USB Micro symbol and footprint
- added ESD protection to micro USB
- replaced boot switch to boot button
- added crystal capacitor calculations
- added grounded mounting holes
- changed all 0402 to 0603 for hand-soldering
- "Do not populate" for J3, J11
- changed J11 pinout for better trace routing
- changed J2 and J4 to horizontal connectors
- finished PCB design
- changed and added numerous printed parts
- ordered and assembled board
- verified built-in LED working
- verified laser circuit working
- verified HSE crystal circuit working

Issues

- AMS1117-5.0 was initially dead; replaced
- USB micro B had two pins shorted; lifted GND pad when trying to remove

Changes to v1.1

- STEP and DIRECTION Test Points pins are incorrect on A1 and A2
- BOOT0 had a 100nF capacitor to GND instead of pull-down resistor; this caused floating issues when programming

To do:

- test pin functions on bluepill as specified:
- end stop interrupts
- UART Tx and Rx from pi 5
- YAW/PITCH motor function
- RIGHT/LEFT motor function
- dual-camera stuff with pi 5