This is yet another dark sensor DIY kit. It is slightly different from other dark sensor kits. It has a buzzer and a photodiode that makes it different from other kits. Along with the LED, the kit turns on the buzzer whenever it senses darkness.

See all the images below to get the idea for assembly. You can see all the images on Flickr also.

This is yet another dark sensor circuit

One more dark sensor project

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