2

For a project I would like to power the 3b+ and the official 7” touch display using the official POE hat.

I figured that I could connect the display board to the pi via the jumper wires to 5v and GND as usual, and power it the other way round. Would this work?

I already tried powering the display board using a USB cable connected to one of the pi USB ports, but that did not work.

F1Linux
  • 1,677
  • 1
  • 15
  • 32
Cortado
  • 31
  • 6

2 Answers2

5

I had the exact problem as you. Found it was not possible due to the form factor of the Pi 3B+ when a PoE Hat affixed to it to fit in the "Smarti Pi Touch" case. Used a PoE Splitter (£9.90 in VAT from Amazon.co.uk) as a workaround. The power from the PoE switch is sufficient to drive both the Official 7" LCD Display AND the 3B+ Best of all, the door closes on the "Smarti Pi Touch case" ;-)

PoE Splitter used to power both the 7" display and Pi

F1Linux
  • 1,677
  • 1
  • 15
  • 32
0

Finally came around to try this. Simply connecting the 5V and ground pins from the display board to GPIO pin 4 and 6 worked. I had to raise the GPIO pins (https://www.adafruit.com/product/2223 ) so they protruded from the POE hat. This required to raise the POE header too.

Cortado
  • 31
  • 6