I need a circuit diagram for running a motor using a battery pack (3 volts) that uses a photo-resistor for a switch. Really sorry for bothering you with such simple question but i am new to this thing.
Thank-you. The attached was my previous circuit it did not work.
dlgoff
Aug13-08, 07:05 PM
The photoresistor is just that a resistor. It will limit the current through the motor. You can drive the motor with a transistor that is switched on by the photoresistor however.
karthiksk
Aug14-08, 03:57 AM
but the photoresistor has too much resistance even wen exposed to sunlight. The max the resistance has dropped to is abou a 100 ohm
karthiksk
Aug14-08, 04:01 AM
but the photoresistor has too much resistance even wen exposed to sunlight. The minimum the resistance has dropped to is about a 100 ohm
berkeman
Aug14-08, 12:21 PM
but the photoresistor has too much resistance even wen exposed to sunlight. The minimum the resistance has dropped to is about a 100 ohm
So what do you think would happen if you connected the photoresistor between the + supply and the base of an NPN transistor, where the NPN's emitter is grounded, and its collector is connected to the - side of the motor.....?