? asked in Science & MathematicsEngineering · 7 years ago

Advice on Light Dependent Resistor (LDR)?

I would like to control a 3V motor using a LDR which would get it's light from a graphic on a computer screen. The motor speed would be dependent on how bright a block on the screen is, varying from black to white - full speed, off.

I need a bank of LDR's controlling several motors with software controlling the shade of the black squares (each LDR will be insulated from the others with a rubber housing).

Could you give me advice on which make/model LDR would be suitable for the light range and voltage.

Much obliged.

Update:

(The LDRs are attached to the monitor screen in their housings)

1 Answer

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  • 7 years ago
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    Any LDR will do. You need to amplify the signal to drive the motors so some sort of transistor circuit is required.

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