SIM900a Modem IMEI 0, Help with TX RX Pins - Microcontrollers - Arduino Forum
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Hello I have Simcom SIM900a GSM (SIM900 (SIM900A) Mini DEV Board v3.9.2) and I am interfacing it with Arduino UNO. I have no idea how to connect SIM900a to Arduino UNO. What I did now is: I connect the following Pin from above Image to: 5 to: GND (Digital GND near Pin 13) 6 to: 5V of Arduio 2 to: GND of Arduino near 5V 3 to: Digital Pin 0 of Arduino (RX) 4 to: Digital Pin 1 of Arduino (TX) 1 to: (No idea) From Picture option 7, 8, 9 are not connected to anything. Can you please gu
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