Deconz Raspbee II, Dresden Electronics shields occupy 10 pins of Raspberry PI, including all 5 V / 3 V. At same time the DIN casings for Raspberry PI do often provide, a fan that needs a power supply itself. enter image description hereHow if at all the power supply can be shared and/or provided, yet direct access to those pins is blocked by raspbee II shield?

My Raspberry PI is of version 4B

  • Do you have a link to your HAT's product page? Commented Jan 11, 2021 at 3:49
  • Here it is: phoscon.de/en/raspbee2 Commented Jan 11, 2021 at 16:39
  • I find it even more current for use cases with DIN rail, where normally a external power supply applies for very much same 5V & GND pins. Now it will be the HAT, fan and power supply competing on those pins. Commented Jan 11, 2021 at 16:43

2 Answers 2


Here you have images who shows pins who provide power (3.3 and 5 volts). As the two 5v pins are used by RaspBee2, you still have two 3.3 volts free pins.


  • Fan red wire = pin 1 or pin 17
  • Fan black wire = pin 9 or pin 25

Working config

I have same configuration (Raspberry 4b + RaspBee2) and I connected a 5v fan on pin 17 and 25. Works like a charm and less noisy than before (without RaspBee and fan red wire on a 5v pin)

Draw of pin use to connect power

Schema of pin


If the fan is installed on the SoC (as in your picture), you can just trim the fan wires and solder them to the PCB. GND and 5V pads can easily be located on the back side of the PCB, below the GPIO header.

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