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What do power pins do on a Raspberry Pi?
Typically any power pins on GPIO area are used to power extended circuits. You need to realise that the USB schematic was carefully designed to be used as the primary +5V input and protects the Pi from getting fried. The GPIO pin does not offer this protection fully and you really need to trust your power supply if you want to do that!
Can a Raspberry Pi use a GPIO power adapter?
Using power adapters that are rate more than 1AMP (1000ma) is fine. The Raspberry Pi will not use more than 800ma any way- But the voltage HAS to be 5votls First of all, using 5V GPIO pin you are bypassing input fuse that is on the RPi. This means you have no protection in case you make some short cut etc.
Can a GPIO pin supply 5V power?
To answer your question. Yes you can supply 5v on the GPIO pin. BUT, it has no backward protection and it was not really designed to be a 5volt input pin. the 3.3v pin can also be powered with 3.3v as the regulator has build in protection- but again it leaves your BCM unprotected!
Can You Power a PI through a 5V pin?
The 5V net shows ups at the right of the schematic Note that the USB input is additionally protected from reverse power, it is a good idea to replicate both of these protection schemes in your set up. Keep in mind that these largely protect the operator and the power supply.
What can a GPIO header do for a Raspberry Pi?
If you embed your Raspberry Pi board with some hardware components, the GPIO header will become quite useful. GPIOs will allow you to read some basic sensors (ex: infrared), control some actuators (those which are working with a ON/OFF mode), and communicate with other hardware boards, such as Raspberry Pi, Arduino, Beaglebone, Jetson Nano, etc.
Why are there 4 Poe pins on Raspberry PI3?
If you take a look at the schematics, those 4 pins are used to feed the Ethernet power signal from the Ethernet port to the PoE Hat to the. EDIT: As @JaromandaX points out I was looking at the schematics the wrong way. Those four pins are used to (of course) transfer the power and not the data to the hat.