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Source Code
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#include <SoftwareSerial.h>
#include <WiFi.h>
#define PIR_PIN 27
#define BUZZER_PIN 26
// SIM800L GSM module
#define SIM800_TX_PIN 17
#define SIM800_RX_PIN 16
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* phoneNumber = "your_phone_number";
SoftwareSerial sim800lSerial(SIM800_TX_PIN, SIM800_RX_PIN);
void setup() {
Serial.begin(115200);
sim800lSerial.begin(9600);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi.");
pinMode(PIR_PIN, INPUT);
pinMode(BUZZER_PIN, OUTPUT);
}
void loop() {
// Check for motion
if (digitalRead(PIR_PIN) == HIGH) {
triggerAlarm();
sendSMS("Motion detected!");
delay(5000); // Wait for 5 seconds to avoid sending multiple messages
}
}
void triggerAlarm() {
digitalWrite(BUZZER_PIN, HIGH);
delay(2000); // Buzzer duration (in milliseconds)
digitalWrite(BUZZER_PIN, LOW);
}
void sendSMS(const String& message) {
sim800lSerial.println("AT+CMGF=1"); // Set SMS mode to text
delay(100);
sim800lSerial.print("AT+CMGS=\"");
sim800lSerial.print(phoneNumber);
sim800lSerial.println("\"");
delay(100);
sim800lSerial.print(message);
delay(100);
sim800lSerial.write(26); // Ctrl+Z to send the message
delay(100);
}
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