I have an Arduino Uno board companied with a SIM900 shield (the one in the picture). By uploading this code to Arduino, I am able to send an SMS to my phone number (I think that means; the Arduino and the shield are working properly) However, when typing AT command in serial monitor of Arduino prog…

No response to AT command in Arduino shield SIM900

josepmor January 30, 2019, 9:36am 3

Thank you very much. What I did is I rewired the circuit again and I might have had some problem with a wire or something. But it finally works!

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