Voting resources, early voting, and poll worker information - VOTE. ... Adafruit is open and shipping.
0

Metro Mini 328 has +3.7V on USB pin when powered by Vin
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Metro Mini 328 has +3.7V on USB pin when powered by Vin

by Looby219 on Sat Aug 08, 2020 10:23 pm

I power the metro mini 328 with a 3.7V lipo battery to the Vin pin. I want to be able to charge my product AND program it from one micro USB port, so I have the USB pin going to my charge circuit. The only problem is that the USB pin still has 3.7V from the battery even when nothing is plugged in, causing the charge circuit to turn on, so that battery essentially charges itself and wastes energy. I think the diode that is supposed to prevent voltage going TO the USB port is broken. Any other way to get +5V ONLY when the mini is plugged in?

Looby219
 
Posts: 1
Joined: Sat Aug 08, 2020 9:14 pm

Please be positive and constructive with your questions and comments.