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 ...

Scientists at the U.S. Department of Energy’s Lawrence Berkeley National Laboratory and the University of California at Berkeley have created the world’s first all-integrated sensor circuit based on ...

Circuits in the sensor detect which output the controls need. Such sensors connect loads in light-on or dark-on for one wire, and V+ or V– for the other. That way, users only have to stock one ...