TouchwheelSAO
Capacitive touchweel SAO for Hackaday Supercon 2024
Features
- Three capacitive touch pads arranged in interleaved disk, builds on touchwheel0
- Three “Neopixel”-compatible side-light RGB LEDs that shine through the center
- Standard SAO pinout w/ I2C. Spare GPIO lines wired to UART TX/RX
- Finger position 0-255 readable via I2C, LEDs controllable via I2C. See register map for details
- One status LED on back of board
- ATtiny816-based, same as seesaw boards
- Easy compilation using standard Ardiuno toolchain and megaTinyCore
- Uses modified TouchyTouch captouch library, included
Production details
- View BOM
- View SCH PDF
- Production files: gerbers zip, bom csv, positions csv
Renders:
Prototype Demo:
https://github.com/user-attachments/assets/b0e4c4f9-f228-49bc-8d6e-ceb53a960fb6
Prototype Renders
- Render2:
https://github.com/user-attachments/assets/08d6583a-afa1-4c01-aba5-ca108eea4f24
- Render1:
https://github.com/user-attachments/assets/c628ba94-1a07-43ad-b761-b3852f8f35f7
Notes:
- Related to touchwheel0
- Uses ATtiny816, using megaTinyCore for Arduino
- 9Sep2024: Originally designed for QFN, but SOIC requested. ATtiny816 comes in hilariously wide SOIC
- 16Sep2024: Back to QFN for ATtiny816 for JLC assembly.
- 16Sep2024: SAO header must be hand switched to be same side (“top”) as SMD in positions.csv for JLC to assemble it correctly