STM32_TestCall/STM32_TestCall.ino at main · MwarandusLab/STM32_TestCall · GitHub

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// Pin Definitions

#define POWER_KEY_PIN PA8 // Power key for the GSM module

// Create HardwareSerial for STM32 (UART2 is already set up in STM32CubeMX)

HardwareSerial sim800Serial(2); // Using UART2

// Phone number to dial

String phoneNumber = "+1234567890";

void setup() {

// Start Serial communication for debugging (for USB port)

Serial.begin(9600); // Communication with STM32 USB serial monitor

sim800Serial.begin(9600); // Communication with SIM800C module via UART2

// Power on GSM module

pinMode(POWER_KEY_PIN, OUTPUT);

digitalWrite(POWER_KEY_PIN, HIGH); // Set HIGH to power on the GSM module

delay(3000); // Hold HIGH for 3 seconds

digitalWrite(POWER_KEY_PIN, LOW); // Set LOW to power it on

// Allow time for SIM800C to initialize

delay(5000); // Wait for GSM module to power up and initialize

// Send a simple AT command to check if the GSM module is responsive

sendATCommand("AT", 1000); // Send AT command to check for response

// Make a call to the specified phone number

makeCall(phoneNumber);

}

void loop() {

// Nothing needs to be done in the loop for this example

}

// Function to send AT command and check for response

void sendATCommand(String command, unsigned long timeout) {

Serial.print("Sending: ");

Serial.println(command);

sim800Serial.println(command);

unsigned long startMillis = millis();

while (millis() - startMillis < timeout) {

if (sim800Serial.available()) {

char c = sim800Serial.read();

Serial.write(c); // Print response from GSM module to serial monitor

}

// Function to make a call using the GSM module

void makeCall(String number) {

String command = "ATD" + number + ";"; // ATD is the AT command for dialing a number

sendATCommand(command, 5000); // Dial the phone number

Serial.println("Call initiated to: " + number);

// Wait a bit before returning to ensure the call has been attempted

delay(10000); // Wait for the call to be connected or the timeout period

}

STM32_TestCall/STM32_TestCall.ino at main · MwarandusLab/STM32_TestCall · GitHub

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