DAQ Plot is a simple to use strip chart application that plots electrical signals and controls devices in realtime. Its main interface looks like this:

Selecting the  DAQ Plot  ►  Tools  ►  Turn Acquisition On  menu item starts the process. But, first you need to attach a compatible analog to digital converter (DAQ Hardware) to your computer and configure it. For that see the tutorial First Project. If you do not currently have DAQ hardware then see the Simulation tutorial.