This project using an Arduino to keep PC powered on.

I needed an option to keep a remote PC powered on all the time. Wake on lan just didn't want to work properly so that's a nice solution.

The Ardunino senses if 5V is present on the pin, if there's no 5V it'll ground the power switch to turn it on.

1. Arduino (Nano in my case).
2. Some jumper wires.

I tried it with ATTiny85 and it's work great, same code, different pins.