Light sensor This an inteesting circuit than can light a LED or RELAY depending on the light coming to the photocell.. The circuit has a variable resistor to adjust when the LED (or RELAY) have to light. If you decide to conect a LED on the circuit's output be sure to install a 1000 Ohms resistor between the LED and the circuit's output . 
 
 
 
Componenets: 

1 x NE555	1 x 2.2KOhms
2 x 1N4003	1 x 0.1µF
1 x Photocell (<3KOhms in light)	1 x 10KOhms variable

 

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