Power Over Ethernet is a widely used concept to power up remote devices like Arduino, Raspberry pi or any other embedded devices working on low voltage and power.There are ready made modules available in the market but are expensive so in this tutorial i will show you to make the cable modified to work for POE.
Ethernet cable uses 4 pairs of wires but out of them only 2 pairs are used and the remaining are unused so those can be used to carry power to the end devices.As the below image shows the unused colored wires.
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