How to give power supply to gsm module?

Using Arduino Motors, Mechanics, Power and CNC
1

Hi,

I am interfacing simcom's gsm module SIM900 with Arduino.
First I have given power supply to gsm module from the Arduino i.e. +5V and GND. In starting days it worked fine.
But now it is working only on the AC to DC adapter (12V), That is why I bought 12V rechargeble battery. How to give power supply to my gsm module with the battery.

  • GSM Module has +5V pin only.

Battery specifications are:

Amptek Sealed Rechargeble Battery,
MODEL: AT12-1.3 (12V 1.3AH/20HR)

Constant voltage charge
Cycle use: 14.4 - 15V
standbye use: 13.5V-13.8V
Initial Current: less than 0.39A

Thanks in advance.

2

Hi Shivaaprs

Are you using an arduino shield with the SIM900 module or are you using the module directly? If you use it directly the datasheet states that it want 3.4 - 4.5 volts. I would think that most arduino shields would run on 5v and use a regulator to turn that down.

I think that supplying it with 12v will probably damage it.

Best
Esben

3

It will also need perhaps 2A capable supply, GSM modules draw high current peaks
when transmitting, many times the receive-time current, and in pulses since the
GSM transmission is in time-slices. The peak current will be many times any
average current a multimeter would measure.

4