🚀 An Arduino-based ultrasonic sensor system that monitors trash bin levels and displays the fill percentage on an LCD.

This project uses 3 HC-SR04 ultrasonic sensors to measure the height of trash inside a bin. The Arduino processes the sensor data, calculates the fill percentage, and displays it on a LiquidCrystal I2C LCD screen. Additionally, it logs the readings to the Serial Monitor for real-time debugging.

✅ Real-time trash level detection using ultrasonic sensors
✅ LCD display output showing trash bin fill percentage
✅ Serial Monitor logging for debugging and calibration
✅ Simple and efficient calculation method for accurate level readings
✅ Modular and expandable (can integrate WiFi/Bluetooth for remote monitoring)

• 💥 Arduino Uno (or any compatible board)
• 💿 16x2 I2C LCD Display
• 🛁 3 HC-SR04 Ultrasonic Sensors
• 🔌 Jumper Wires
• 🔋 Power Supply

1. The HC-SR04 ultrasonic sensors measure the distance from the sensors to the top of the trash. Each sensor outputs travel time in microseconds, which is averaged to determine the space remaining in the trash bin.
2. The average distance is converted into inches and centimeters.
3. The fill percentage is calculated using:

   trash = ((132.0 - inches) / (132.0 - 2.0)) * 100.0;

   • 132 inches → Bin is empty (0%)
   • 2 inches → Bin is full (100%)
4. The fill percentage is displayed on the LCD screen and printed to the Serial Monitor.
5. The system updates every 2 seconds for continuous monitoring.

1. Install Arduino IDE (if not already installed).
2. Install the required library for I2C LCD:
   • Open Arduino IDE → Go to Sketch → Include Library → Manage Libraries.
   • Search for LiquidCrystal_I2C and install it.
3. Connect the Arduino via USB.
4. Upload the code in smart_trash_monitor.ino.
5. Open the Serial Monitor (9600 baud) to see live readings.

Wokwi Simulation

• 📡 IoT Integration → Send data to a cloud platform for remote monitoring.
• 🔔 Alert System → Add buzzer or LED to notify when the bin is full.

👨‍💻 Steven Reynoso
🔗 GitHub: github.com/StevenReynoso
📧 Contact: [email protected]