Raspberry Pi doesn't have any analog input pin, while Arduino has some. This project allows your to run the application on Raspberry Pi, and control Arduino via the USB cable. Thus all digital and analog pins on Arduino board are usable on Raspberry Pi.
This example uses a potentiometer to adjust the output voltage from 0 to 5V. A multimeter is connected to keep monitoring the actual voltage. The output voltage is also connected to the A3 pin on Arduino Nano board. A program (could be written in C or
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