GSM WIRELESS SENSOR INTERFACE USING ARDUINO - Project Center in Trichy IOT EEE Internship Final Year- Power Integrated

GSM WIRELESS SENSOR INTERFACE USING ARDUINO

📡 GSM Interface with Arduino – Short Note

Overview:

A GSM module (like SIM800L, SIM900A) allows an Arduino to send and receive SMS, make or receive calls, and connect to mobile networks. It is widely used for remote monitoring, security systems, and IoT applications.

⚙️ How It Works:

The GSM module communicates with Arduino via Serial Communication (TX/RX) using AT commands.
A valid SIM card is inserted into the GSM module.
The module connects to the cellular network and operates over 2G.

✅Working Principle:

The gas sensor contains a chemical-sensitive material that changes resistance based on gas concentration.
Outputs:
- Analog Output (A0) – Gas concentration level
- Digital Output (D0) – High/Low signal based on threshold (adjustable via potentiometer)

🔌Connection:

GSM MODULE
POWER Adapter.
Arduino Board
Jumper Wires

GSM Module	Arduino
VCC	5V (or 4.2V for SIM800L)
GND	GND
TX	D7 (SoftwareSerial RX)
RX	D8 (SoftwareSerial TX)

🔌 Circuit Diagram:

📝 Sample Arduino Code:

#include <SoftwareSerial.h>

// GSM module connected to pins 2 (RX) and 3 (TX)
SoftwareSerial mySerial(2, 3);

void setup() {
mySerial.begin(9600); // GSM module baud rate
Serial.begin(9600); // Serial Monitor
Serial.println(“Welcome to GSM Interface”);

// Send initial SMS
sendSMS();
}

void loop() {
Serial.println(“Hi”);
sendSMS(); // Call function to send SMS
Serial.println(“****How Are You****”);
delay(10000); // Wait 10 seconds before sending again
}

void sendSMS() {
mySerial.println(“AT+CMGF=1”); // Set SMS text mode
delay(1000);

mySerial.println(“AT+CMGS=\”+91XXXXXXXXXX\””); // Replace with actual phone number
delay(1000);

mySerial.println(“Hello from Arduino!”); // SMS content
delay(1000);

mySerial.write(26); // Ctrl+Z to send
delay(3000); // Wait for message to send
}

✅ Key Fixes:

Moved void loop() out of setup() — it was wrongly nested.
Improved delay timings for GSM response handling.
Added comments for clarity.
Used mySerial.write(26) instead of mySerial.println((char)26) for better control-Z signaling.

Let me know if you want to:

Receive SMS
Trigger actions based on received messages
Control appliances via SMS

✅ Applications:

Burglar alarm system
Fire detection alert system
Weather data SMS alert
Vehicle tracking

📞 For More Details & Project Support:

📍 Location:
10A/3, Radhakrishnan Colony,
Sasthri Road, Tennur,
Tiruchirappalli, Tamil Nadu – 620017

📍 View on Google Maps

📧 Email:

contact@powerintegrated.in
powerintegratedsolutions@gmail.com

📱 Phone / WhatsApp:
+91 76393 85448
+91 82488 85959

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