Adafruit PCF8591 Quad 8-bit ADC + 8-bit DAC - STEMMA QT / Qwiic

Measuring voltage and adjusting it is what electronics is all about so you won’t get far without friends like the Adafruit PCF8591 Quad 8-bit ADC + 8-bit DAC combo. Analog to Digital Converters help by measuring an analog voltage and turning it into something a microcontroller like a Metro or Arduino can understand. If you’re using a single-board computer like a Raspberry Pi, you might not have any other way to measure a voltage because even though they are well equipped for digital circuits, many boards of that type don’t have any pins that can measure analog voltages.