I have a device that puts out 0-5v based on what it's doing. How can I use the raspberry pi to read those voltages? I would then have scripts do whatever is needed or maybe display via a webpage. I would like the pi to log the readings every second or every few seconds, just not sure how to start.
You could use the ADC built into most* Arduino and connect to it using you RPi via a python script as depicted in this tutorial