4 layers117 × 107 mm

Mainboard dual battery
shurik179/yozh
Small robot based on Pololu's Zumo chassis but programmable in CircuitPython
121 parts8MIT
Boards in 2 GitHub repositories, designed in KiCad, that use the ITR9909 by Everlight Electronics (50mA DIP-4 Reflective Optical Interrupters ROHS). See how each wires it, with its parts, size, README and files; the ITR9909’s symbol, footprint and pinout are on its own page.

shurik179/yozh
Small robot based on Pololu's Zumo chassis but programmable in CircuitPython

nathmo/Sthymuli-cardinalboard
companion boardto the sthymuli motherboard