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gcormier / megadesk

Open-source IKEA Bekant controller board
GNU General Public License v3.0
717 stars 53 forks source link

Can I power a Wemos D1 Mini v3 from 5V + GND ports? #83

Closed frankhommers closed 2 years ago

frankhommers commented 2 years ago

Would it be possible to power a Wemos D1 Mini v3 from the 5V + GND pins? Or would it be better to use a separate power supply for that?

gcormier commented 2 years ago

I would definitely recommend a separate power supply, as the regulators on the megadesk are already doing a lot of work to drop the 24V down to the needed 12V and 5V. While the regulators still have capacity in terms of milliamperes to provide, they do not have much thermal headroom.

You can read more https://www.sparkfun.com/tutorials/217 https://electronics.stackexchange.com/questions/431361/lm317-calculate-dissipation-due-to-voltage-drop

You could tap the 24V incoming power (red wire) and ground (black) to run to a secondary power supply to power your D1 mini.

frankhommers commented 2 years ago

Thanks I will do that.