A Digital Logic System for Real Time Water Wastage Detection

Overview

AquaSense addresses a real world problem: water wastage. The system continuously monitors water flow and human presence. When water flows without anyone present, it identifies the event, triggers an alert, and logs it automatically.

Built entirely with logic gates, counters, and displays, AquaSense demonstrates how fundamental digital electronics can power practical, low cost solutions for everyday sustainability challenges.

Objectives

• Detect unnecessary or unattended water usage
• Alert users instantly using LED and buzzer indicators
• Automatically count and log waste events
• Apply core digital logic concepts to a real life scenario

How It Works

AquaSense processes two inputs, a water sensor and a presence sensor, through a set of logic gates to determine the system state.

Condition	System Response
Water flowing, no person present	Waste condition detected; red LED and buzzer activate
Waste condition detected	Counter increments and 7 segment display updates
Water flowing, person present	Green LED activates, indicating normal operation

Circuit Architecture

The circuit is organized into four functional sections:

1. Input Section: Sensors (water and presence)
2. Logic Section: NOT and AND gates for condition evaluation
3. Counter Section: 7490 counter for event tracking
4. Output Section: LEDs, buzzer, and 7 segment display

Components Used

• SW SPDT switches
• NOT Gate (7404)
• AND Gate (7408)
• Counter (7490)
• Decoder (7447)
• 7 Segment Display
• LED (Red and Green)
• Buzzer
• Resistors (330Ω)
• VCC and Ground

Applications

• Homes
• Schools
• Offices
• Public washrooms
• Water conservation systems

Conclusion

AquaSense demonstrates how digital logic can be applied to solve real world problems. By combining simple, low cost components, it delivers an effective system that actively promotes responsible water usage.

---