A simple GSM-based Flood Detection System using gizDuino (Arduino-compatible board), SIM900D GSM module, and US-100 Ultrasonic Sensor.
This project detects rising water levels and automatically sends SMS alerts to registered phone numbers.

This flood detection system continuously monitors water levels using sensors connected to a gizDuino board.
Depending on the water height, it sends warning messages via the GSM network to predefined mobile numbers.
The system also triggers indicator LEDs and a buzzer based on alert levels.

• ✅ Detects 3 water level stages (Normal, Level 1, Level 2, Level 3)
• ✅ Sends SMS notifications automatically
• ✅ Alerts multiple registered users
• ✅ LED indicators and buzzer alarm
• ✅ Compatible with gizDuino and SIM900D GSM Shield

📝 Note: Check your GizDuino manual for pin compatibility and GSM shield pin assignments.

Messages are sent to all registered phone numbers defined in the regNumbers[] array:

char* regNumbers[] = {"09150000000", "09360000000"};
int numNumbers = 2;

/**
  *
  *  Compiled and coded by:
  *  Gerard James B. Paglingayen
  *  
  *  Components:
  *  - Gizduino (Arduino Clone)
  *  - GSM Shield (SIM900D)
  *  - Water Level Sensors
  *
  *  Note:
  *    Read the Gizduino Manual, especially the Pin configuration.
  *    
 **/

Main functionalities include:

• initGSM() → Initializes GSM module
• send_msg() → Sends individual SMS message
• sendMulti() → Sends message to multiple numbers
• readSerialString() → Reads GSM response from serial
• send_cmd() → Sends AT commands and verifies GSM response

1. Install Arduino IDE
2. Select Board: Arduino Duemilanove w/ ATmega168 (or GizDuino v4.1 equivalent)
3. Select correct COM Port
4. Load the sketch (FloodDetector.ino)
5. Upload to gizDuino

• Ensure GSM antenna is properly connected.
• Use an active SIM card with SMS capability.
• Power supply should meet the GSM module’s current requirement (2A peak recommended).
• Test each water level sensor before full deployment.

• Integration with IoT dashboard for remote monitoring
• Solar power backup
• Additional sensors for rainfall and temperature

Gerard James B. Paglingayen
DICT Trainer | IoT & Arduino Developer
📍 Philippines

This project is released under the MIT License — feel free to modify and expand for educational or research use.