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Posted: Fri Jun 28, 2019 12:49 pm
by Seeed Tech Support

Hi Robert

I just use the 3.7v lipo battery and test with code. It works and here is the reading.  Please ask customer to take picture about his battery connection with seeeduino lorawan board. thanks. 


Thanks

best rgds
Bill

Posted: Fri Jun 28, 2019 1:33 pm
by Anonymous
I can get that same result IF I connect a USB cable that that is data + power (VCC wire).

If I connect a USB cable that is Data ONLY (no VCC wire) so the battery is the only thing powering the seeeduino via the JST port , I get the 0.28V reading.

I want to program the seeeduino to send lorawan payload if the battery voltage drops which means there will be no USB connected.

Posted: Fri Jun 28, 2019 3:09 pm
by Seeed Tech Support
Hi 

Robert ~

If there is no 5V, then the VIN will be 0V. It can not open the MOS Q4. So there is NO reading from  A4_PA05_AIN5/VBAT. 

If you want to read it with 5V power supply, you have to short the R56 which is NDP(NO not place this moment).







Thanks

best rgds
Bill



Posted: Fri Jun 28, 2019 3:10 pm
by Seeed Tech Support
If you want to read it without 5V power supply, you have to short the R56 which is NDP(NO not place this moment).

Thanks

best rgds
Bill

Posted: Fri Jul 05, 2019 10:55 am
by Anonymous
Hi Bill,

Thanks for getting back to me, is there another way I can achieve this? Can I run an extra wire from the battery?

Posted: Fri Jul 05, 2019 10:57 am
by Seeed Tech Support
Hi

Robert 

Yes, You can. 

Thanks

best rgds
Bill


Posted: Fri Jul 05, 2019 11:06 am
by Anonymous
Do I just run this wire to the A4 pin on the Seeed?

Is there another pin out on the Seeeduino I could jumper to A4? I am trying to avoid having to connect / solder a wire from the battery.

Posted: Fri Jul 05, 2019 11:27 am
by Seeed Tech Support
Hi 

Robert You can use the A4, you can NOT use other analog pins, as they only support 3.3v as max. But the battery is around 3.7V~4.2V. The A4 have a voltage inside of the circuit. So it can support higher voltage. thanks.

Posted: Fri Jul 05, 2019 12:57 pm
by Seeed Tech Support
Hi there~

If you want to read it with 5V power supply, you have to short the R56 which is NDP(NO not place this moment).

I mark the R56 in yellow. thanks. 









Thanks

best rgds
Bill