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.  Document Library Name Description Information Sheet 1 Handy to have info. LED Hookup Learning to use a proto board to hookup a circuit. Using LED's Different ways to use LED's CdS Cell - Phororesistor Using CdS Cells with the BS2 Board of Edication. CdS Cell Light meter with ADC A simple digital light meter that uses an A/D concerter. Photo Diode Light Detector Uses a Photo Diode to detect light. Photo Transistor Sensor A wider spectrum and more sensitive light sensor. Infra Red Object Detection Uses a Panasonic IR receiver and LED transmitter. Infra Red Ranging with GP2D12 Get distance measurements with IR. Voltmeter using an ADC A to D conversion of a voltage using a BS2. Magnetometer using ADC Using a Hall Effect sensor and ADC with a BS2.