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Topic: Vin power supply problem (Read 192 times) previous topic - next topic

damos02

Apr 21, 2019, 11:43 pm Last Edit: Apr 21, 2019, 11:45 pm by damos02
Hello,

I'm powering a GSM shield with a 10 volts battery. Arduino Mega is powered through USB. Doing like this, the communications between both through the serial port 1 is OK.

However, when I also power Arduino with the 10 volts battery through Vin, the serial comunication stops to work.  I've used another trafo (in order to try it with and independent power supply) but the result is the same. No communication.

Communication between PC and Arduino though USB to debug my code is always fine.

┬┐Does anyone know why this is happening?

Thanks.

hammy

Have you connected the 0v ( gnd) points together

damos02

#2
Apr 22, 2019, 11:45 am Last Edit: Apr 22, 2019, 11:45 am by damos02
Yes, all GND are connected together.

I've also tried to power Arduino Mega with a USB Charger and serial communication between Arduino and GSM shield doesn't work too. It's strange... it only works when Arduino is powered through USB connected to a PC.


Does anyone see the problem?
Thanks.

damos02

Using jack to power arduino doesn't work either.

I don't know what else to do...

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