I am working on an Arduino project at the moment, with the following board:

Adafruit Feather 32u4

And it says I need 3.7 V of LiPo to power it.

However I also have a valve that I want to open and close (with a relay that is controlled by the Feather) and that needs 7.4 V. So I considered buying a 7.4 V LiPo battery (like one for RC cars).

The question now is:

  • Is there a way to use the 7.4 V Battery and only use 3.7 V for my Feather, while maintaining the full 7.4 V for my valve relay?

  • And if so, how would I do that? (Would it also still be possible to charge the 7.4 V battery via the USB port of the Feather, as written in the description?)

I am an absolute beginner when it comes to electrical engineering.

Thank you for your help.


You could use a 7.4V Battery and a DC/DC converter (buck type) with 3.7V output voltage (Such a task is the main purpose of DC/DC converters).

  • \$\begingroup\$ Thanks I will check that out. \$\endgroup\$ – user2856188 May 19 at 14:40

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