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GSM module: Code for Calling using Serial communication
void setup() {
// initialize serial communications at 9600 bps:
// print the serial data to GSM
Serial.print("ATD9020XXXXXX;" ); // Change the phone number in code before running the program. change here to call a number using SIM900A
// wait 10 seconds before the next loop
Serial.print("ATH" ); // hold the call
void loop() {
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