Here are some DIY LDR switch circuits available on our website and the web. LDR switches are used to switch a relay or other device when light are present or absent. LDRs or Light Dependent Resistors ...

Blockages in an aquarium drain or a malfunctioning pump can lead to a floor covered in water. Thankfully, with a simple circuit, the right parts, and some spare time, you can build your own overflow ...