Powering Moteino through FTDI while battery connected to Vin ?

[darkcurrent]

Hi all,

Is it possible to leave a 9V battery connected while programming the Moteino using the FTDI adapter? I can't see any voltage protection diodes on the schematics ?

Thanks for your answers.

[EloyP]

Hi darkcurrent (nice handle, BTW),

Hi all,

Is it possible to leave a 9V battery connected while programming the Moteino using the FTDI adapter? I can't see any voltage protection diodes on the schematics ?

Thanks for your answers.

I would not do that because the FTDI adapter's '+'/VCC pin is connected to the Moteino's VIN pin and it supplies 5V (by default, though it can be configured through a jumper to supply 3.3V). So, if you leave the battery connected then there will be a voltage conflict on VIN (5V from FTDI adapter and 9V from the battery).

I had the same problem and asked here:

https://lowpowerlab.com/forum/index.php/topic,1185.0.html

I ended up implementing one of the suggestions by Felix (use a small adapter that leaves out the VCC connection to the Moteino).

It would be nice, if there ever is a revision of the FTDI adapter, to have the capability to disable a voltage on the VCC pin of the FTDI adapter via removable jumper.

Cheers!

Eloy Paris.-