aaron22
Posts: 3
Joined: Fri Sep 28, 2018 3:25 pm

PoE HAT Fan alternate uses

Fri Sep 28, 2018 3:30 pm

I'd like to use the fan power connector to control LED lights instead. I've found this code in the USB issue thread to have the fan on all the time

Code: Select all

echo 40 | sudo tee /sys/class/hwmon/hwmon0/def_pwm1
Would that tiny connector supply enough power to operate a couple 5mm LED lights? I can't find anywhere how much power comes out of there.

ShiftPlusOne
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5339
Joined: Fri Jul 29, 2011 5:36 pm
Location: The unfashionable end of the western spiral arm of the Galaxy

Re: PoE HAT Fan alternate uses

Fri Sep 28, 2018 4:11 pm

It's a 5V line switched by this MOSFET:
https://www.diodes.com/assets/Datasheets/ds31783.pdf

It's not really meant for driving LEDs, but if you keep current draw well under around half an amp, it should be okay.

aaron22
Posts: 3
Joined: Fri Sep 28, 2018 3:25 pm

Re: PoE HAT Fan alternate uses

Fri Sep 28, 2018 4:31 pm

Thank you so much. I'm using 1.5V 30mA 100mW LED bulbs so I'll be more than OK to run a few of them.

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