An LDR and preset pot lets you choose the light level at which the relay will energize.
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LDR Relay Switch No.1 - Photograph

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LDR Relay No.1
Schematic
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Circuit Board

This is a photograph of Light Controlled Relay No.1. The LDR and variable resistor let you choose the brightness level at which the relay will energize. A second version of this circuit - Light Controlled Relay No.2 - will energize the relay when it gets dark.


A Photo Of Ron J's 
Light Controlled 
Relay Circuit No.1


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LDR Relay No.1
Schematic
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