Floppy Tones - Part 4 - H-Bridge CD ROM Drive

Here a H-bridge is being used to drive a CD-ROM drive motor. There are four drives in a CDROM "drive" in total. One for loading and ejecting the CD tray, one for spinning the CD around, one for lifting the eye/laser up to the disk and one for moving the eye along the disk. This is using that fourth motor as it is a typical stepper motor which can nicely produce sound (which can be used to generate notes).

Essentially here the stepper motor is simply being vibrated at a couple of different random frequencies as a proof of concept:

Project File

Video

Stolen picture of typical HBridge pins;

Stolen picture (because of the neatness) of the same wiring I have used;

Real life messey picture

 

Referneces;

http://arduino.cc/en/Reference/StepperBipolarCircuit
http://blog.whattomake.co.kr/158
http://fritzing.org/projects/l293-cd-stepper-driver/
http://www.engineersgarage.com/electronic-components/l293d-motor-driver-ic