Local Flood Potential Warning System (LFPWS)

This repository is an archive of the LFPWS school project developed as a graduation requirement for Class IX at Junior High School (10 August 2025 – 15 October 2025).

The system reads water levels using a sensor and indicates flood potential through a Traffic Light LED module and LCD display, triggering a 120 dB siren/alarm during critical levels.

Hardware Components

Arduino Uno R3

Central microcontroller that processes the sensor data and controls output components.

Water Level Sensor

Submersible sensor that measures water height to detect rising floodwaters.

Traffic Light LED Module

Tri-color indicator (Green for Aman/Safe, Yellow for Siaga/Warning, Red for Bahaya/Danger).

16x2 LCD with I2C Interface

Displays real-time water percentage and status messages.

12V External Siren

Sounds a 120 dB alarm when the water level reaches critical threshold.

Relay Module

Acts as an electronic switch to safely control the high-power 12V siren using low-voltage Arduino signals.

18650 Batteries

High-capacity rechargeable cells that supply stable power (using 3 cells in total).

Battery Holders (Tempat Baterai)

Powers the Arduino (using a 2x cell series pack via DC Jack) and the external siren (using a 1x cell pack).

Assembly Tools & Materials

USB Type-A to B Cable

Used to connect the laptop to the Arduino.

Binder Clips

Used for organizing and mounting components.

Double-sided Tape

Used for securing components in place.

Screwdriver

Used for securing wired connections.

Thinwall Plastic Container

Plastic container used as the device enclosure.

Jumper Wires

Male-to-female jumper wires for electrical connections.

Wiring Configuration

• Water Level Sensor:
  • Output pin -> Analog A0 on Arduino
• Traffic Light LED Module:
  • Red LED -> Digital 4
  • Yellow LED -> Digital 3
  • Green LED -> Digital 2
• 16x2 LCD (I2C):
  • SDA -> Analog A4
  • SCL -> Analog A5
• Relay Module (for Siren):
  • Control pin -> Digital 7
  • COM -> Battery (+)
  • NO -> Siren (+)
  • Siren (-) -> Battery (-)

Threshold Levels

• Aman (Safe): Sensor value < 341. Green LED stays on, LCD prints Status: AMAN.
• Siaga (Warning): Sensor value 341 - 649. Yellow LED blinks every 500ms, LCD prints Status: SIAGA.
• Bahaya (Danger): Sensor value >= 650. Red LED blinks every 250ms, LCD prints Status: BAHAYA, and the 12V siren runs for 3 seconds once.

Installation & Upload

1. Open the lfpws.ino sketch in Arduino IDE.
2. Install the LiquidCrystal_I2C and Wire libraries if not present.
3. Select board Arduino Uno and your corresponding port.
4. Upload code to your board.