It runs on an Arduino MEGA 2560 PRO (or similar microcontroller) and supports a wide array of additional hardware including pressure transducer, water level sensor, flow meter, OLED display ...
While newer Arduinos and Arduino compatibles (including the Hackaday.io Trinket Pro. Superliminal Advertising ... the Uno and Mega, actually have two chips. An ATMega16u2 takes care of the ...