I have a Raspberry Pi that is always on for connectivity to my security equipment while I am away from home. Occasionally it would be useful to turn my PC on remotely and as the Pi is always on, I could use that. Initially I thought of using a relay switch, but I saw an article on using a Light Dependent Resistor (LDR) and a Light Emitting Diode (LED) to close a circuit. I thought was neat with no moving parts and compatible with low voltages found on the Pi, so I investigated.
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