In this blog I will show you how to generate pwm with a computer with a serial port. This tool was originally written by subcooledheatpump from YouTube. I made it better where you can choose which com port to use(by command-line or by being prompted to do so). Controlling it is now better since now it doesn’t pick up keys being pressed when its not supposed to. That feature there probably made where you need windows 2000 or higher.