Good day, the SIM900 GSM module has an operating voltage of 3.4V – 4.5V (shield 4,5-5,5V). It draws high current up to 2A when transmitting data. Normally module consumes around 300-500 mA. I have SIM900 shield with DC jack and 3A regulator. I can solder pins for connect to Arduino. I saw on youtub…

SIM900 and current from Arduino

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