Circuits for Four by Four

Automatic dark detector senses darkness.

modified from http://www.buildcircuit.com/darklight-sensor-using-transistor/ 

and

http://www.instructables.com/id/LED-nightlight-that-turns-on-in-darkness/

 

(1 ) As the light level decreases and LDR meets the maximum threshold resistance, the circuit automatically switches on the LED D1.  For more information download the file attached:

Automatic dark detector senses darkness

Videos – Step by step how to set up the circuit:

 

Lights up when there is light.

 

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