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How do I use the FONA with 3V Input
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How do I use the FONA with 3V Input

by pmcconico on Thu May 27, 2021 10:52 am

I would like to use the FONA with 3V input. Current pinout:

FONA -> Arduino Uno
5V -> 3.3V
GND -> GND
VIO -> 3.3V
KEY -> GND

With this configuration the FONA is not powering on. What am I doing wrong?

pmcconico
 
Posts: 6
Joined: Fri Feb 12, 2021 1:42 am

Re: How do I use the FONA with 3V Input

by rskup on Thu May 27, 2021 1:44 pm

Hi pmcconico,

On my FONA/Feather combo I don't have the 3.3 V Feather pin going to the FONA 5 V pin, and it's been working fine that way for many months now.

Here it is packed in an old rotary phone:
viewtopic.php?f=54&t=170985&p=835278#p835278

In the pic you might see a little blob of solder at the FONA 5V pinout, but that's just leftover solder from when it was connected to my UNO, there's no wire soldered there now.

So try it without that "5V -> 3.3V" wire, works for me, hope it works for you!

rskup
 
Posts: 84
Joined: Sat Aug 01, 2020 9:04 pm

Re: How do I use the FONA with 3V Input

by pmcconico on Fri May 28, 2021 12:19 pm

Thanks @rskup. You're right it's working without connection to 5V pin.

pmcconico
 
Posts: 6
Joined: Fri Feb 12, 2021 1:42 am

Please be positive and constructive with your questions and comments.