Activate a Photocell

Thread Starter

Werewolfzz

Joined Feb 10, 2010
2
I am a student working on a Science Olympiad project. I am to use a photocell that will provide the power to operate a motor. I am currently using a 3volt dc motor and two C batterries. I have done research and found the use of a relay in conjunction with the photocell may be the way to accomplish the task. Is this correct and if so I could use some help constructing the components.
 

retched

Joined Dec 5, 2009
5,197
With out a transistor, you put the LDR in line with the motor. That will cause the motor to slow down as the light gets dimmer. You may want to add a POT or another resistor to make sure all current is limited.

You could also put the LDR in line with a relays coil. Not a good idea, but it would work. At dim levels, the relay could chatter. but at full bringht should be fine.
 
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