You definitely don’t want to manually find the correct device name and modify your application every time. If your application running in Raspberry Pi wants to talk to the Arduino, it needs to know the Arduino’s serial device name. So Arduino seems to be a perfect extension for Raspberry Pi to accept analog input, right? We think so, but… every time you connect the Arduino to the Pi, its serial device name may vary. What’s more, many Arduino boards have USB port on board, which allows you to communicate with it via the serial port/USB. Using a poor man’s A/D converter could save your money and time, but its accuracy is not that good.Īrduino usually has 10-bit ADC on board, and can measure voltage with resolution: 5V/1024=0.0049V, which is quite good in most scenarios. However that’s kind of complicated and expensive. You can wire your Pi with an external ADC (analog/digital converter), and measure the analog value via that. Raspberry Pi sadly doesn’t have any analog input, which means you could not connect an analog signal source to the GPIO pin on Raspberry Pi, and monitor its real-time output voltage in your application.

Arduino wire library for raspberry pi