I want to make a 2×2 foot rotating circle as part of my project. I am using a large DC motor with a 12V power supply and a simple gear setup. The motor is connected to an Arduino micro-processor through a TIP120 transistor. I am using a potentiometer to control the PWM (Pulse Width Modulation) signal and drive the motor at different speeds. I got all the gears out of broken inkjet printer. The next thing I have to do is figure out how to drive the motor more slowly, which is proving difficult using PWM. I may try altering the voltage the motor is getting in hopes of slowing it down a bit, and also keeping it running steadily. The PWM is pretty choppy and you can hear the motor turning on and off.
Gear and Motor Setup for ‘The Pasta Cycle’March 2, 2008