GSM project works with UNO, not working with NANO?

Projects General Guidance
1

Hi everyone!
I need help in my current project, and I'm out of ideas.

I've started working on some GSM stuff with Quectel M95 (Hardware design).
Everything worked fine with UNO so I moved to Arduino Nano, to keep the project smaller.
On the beginning I had no troubles. Sometimes the module that holds Quectel M95 hadn't powered up successfully, but when I've unplugged-replugged the Nano the problem disappeared for a while. But now I can't get the gsm module power up for two days with the Nano. If I wire everything back to UNO, it works. Back to Nano: gsm module starts powering up, then powers down after 2-3 seconds.

Somewhere I've read that (maybe) the M95 have some short periods, when it needs 2A of current. But in the hardware design this seems to happen for just a few millisec, and the official Arduino GSM Shield also uses a chip that requires 2A for a short time, so it can't be the problem. Or is it? Maybe yes, but why has it worked with the Nano for days, and not working any more?

I really need your help guys, I'm out of ideas!

Thanks in advance!

2

You aren't actually attempting to run the GSM shield from the regulator on the Nano, are you?

3

For details about current draw and voltage drop look at page 27 of the document you link to.

4

Now I think I should feel bad for torturing my arduinos with too much current, should I?

So this is my current setup: (see attachment: gsm_circuit1.png)
From your answers I think this circuit is wrong.

After thinking about the problem, I hope this reconsidered circuit will work:
(see attachment: gsm_circuit2.png)

Am I doing it right now?

gsm_circuit1.png

gsm_circuit2.png

5

That seems more likely to work.

I do hope your "9V battery" is not a "PP3", but a carrier with six AA or better cells.

"Torturing"?

Most of these regulators are designed firstly to limit the current they provide, and also to shut down if they overheat, so they should not be damaged.

6

Thank you very much for your answers!

One last question about the battery, if you are speaking of them.
I would like to power the whole circuit from a 2.1mm DC jack like the one that the UNO has.

In my theory it will work with 7-12V DC adapters, with 9V batteries (six AA or even "PP3"), etc (everything 7-20V or so).
Is there anything wrong with PP3, or why have you mentioned it?

7

A PP3? To deliver 2 amps momentarily?

As someone on the forum has said before, all they are fit for is to power your smoke alarm.

A five volt, 3 amps switching mode power supply will drive the Arduino, shield and a few accessories and you won't be burning any excess voltage off as heat.

8

Hmm, interesting information. Actually I've found several threads discussing PP3 related problems. Never heared of that the PP3-s are so "weak". I've learned a lot guys, thanks for your time and help! Have a nice day!

9

Hi!

I know this thread is very old but I am currently trying to set up my Quectel M95 with an Arduino Uno but it is not working as I wish it would. Could you tell me how you did it or send your sketch?

Thanks!