For my next "top secret" robot project I need 2 ultrasonic sensors. Playing around with the Maxbotix MaxSonar EZ1, which perfectly matches in size for this task, I stumbled across the following problem.
A brilliant tutorial, I think, with video about motors ad microcontrollers from nerdkits.com. Learn about how a motor works, EMF, use of flyback diodes, control a motor from a microcontroller, PWM etc.
This is one of the main part for my contribution of the LMR Dagu contest. It looks like a small camera and yes indeed it is a camera. But this camera didn't give you a video or picture output. Mhhm, than it must be defect you may think.