Hi All! My problem is that I am trying to initiate a call with my SIM900 GSM board based on a distance measurement using an ultrasonic sensor (HCSR04) and the call does not happen. I am using Arduino Uno. I am not sure if this is a programming issue or a hardware issue (not enough power maybe?). C…

Ultrasonic sensor with GSM board - calling within a distance - #7 by system - Programming

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