- Schematic - licensed with CC-BY-SA 4.0
- Gerber and drl - licensed with CERN-OHL-W v2
- Components
- Li-Ion & LiPoly Batteries (We are obliged to not use Li-Po): https://learn.adafruit.com/li-ion-and-lipoly-batteries
- SQ11 and Arduino: https://dntruong.wordpress.com/2018/01/06/testb/comment-page-1/
- SQ11 Battery update: https://hackaday.io/project/135322-sq11-massive-battery-upgrade
- SQ11 replace battery: https://www.youtube.com/watch?v=LfjU0vTH0U8
- Level shift 5v to 3.3v: https://randomnerdtutorials.com/how-to-level-shift-5v-to-3-3v/
- Battery checker circuit (with RPi pico): https://peppe8o.com/raspberry-pi-pico-battery-checker/
- Another battery checker circuit with potentiometer (with RPi pico): https://electrocredible.com/raspberry-pi-pico-adc-micropython-potentiometer/