SENSORS This information is based in part, on the Parallax Board of Education and the BoeBot.  Most of the parts and and texts are available from www.parallax.com .  The texts can be downloaded for free.  Experience with these projects will provide a better understanding of what the sensors do.  CdS Photo Cell CdS Light meter Download CdS Cell Download CdS Light meter Simple LEDs Using LEDs Download Simple LEDs Download Using LESs Quick Information Sheet Electronic Sympols Quick Electronics Reference Electronic Sympols Object Detection with IR Voltmeter using ADC Object Detection with IR Voltmeter using ADC Magnetometer with ADC Infra Red Photo Diode Magnetometer with ADC Infra Red Photo Diode Infra Red Photo Transistor Object Detection with Infra Red Infra Red Photo Transistor Object Detection with Infra Red Motor reversing control for ROV Mulitvibrator Blinker Motor reversing control for ROV Mulitvibrator Blinker Multivibrator LED Blinker EZ1 Sonar Ranging Multivibrator LED Blinker EZ1 Sonar Ranging Motor reversing switches ROV Simple wiring Motor reversing switches ROV Simple wiring