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Core Electronics Forum

Probs with A6 GSM module and Arduino

#1

G’day all, I have 2 of these modules and neither works as expected. I am testing with the sketches on DFRobots website.

The first does not respond at all and the 2nd shows backward ? characters in the Arduino serial monitor. I think this is a character for decimal 255 which is not what I would expect in response to AT commands.

I’ve read that these module can be quite current hungry and at the moment I have access only to USB power. I’m going to collect a 3A psu tomorrow so will update this after that.

If you’ve had any experience with these I’d love to read how you got on.

Mike H

#2

Problem resolved. The GSM module does indeed chew through the juice. A 3A psu has fixed the problem.

Mike H

#3

Neat, glad to hear you got it working, Mike!

#4

Well, the initial problem was simply the baud rate for the modem. You may find as I did that it defaults to 115200, not 9600. When you set the serial monitor to 115200 you will get a lot of rubbish (corrupted) characters, so I suggest you set it to run at 9600.

I still have a problem though. It will NOT send an SMS or make a phone call. This is extraordinarily frustrating. I’d love to hear from anybody with similar issues.