This board is an ESP8266 shield. It features a PCA I2C servomotor driver, power management and protection, 3.3V to 5V signal conversion for the LED matrix, a buzzer, and I²C/serial extension ports.

This will make the robot much cleaner by replacing multiple jumper-connected boards.

Thanks to PCBWay for sponsoring my project — if you need high-quality PCBs delivered fast, go check out their offers!