Turn on PC remotely

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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