Here's the project I am working on: I would like to read in the voltage change on a sensor that I have. It has a positive and negative wire coming from it. I then have the raspberry pi 2. The positive end of the sensor has 5v coming out of it. I am using a MCP3008 ADC chip to get the analog signal to digital.
I hook it all up and turn it on, and the sensor does not turn on. The only thing I don't know where to place, is the negative end of the sensor.
Any and all help is appreciated.