- Introduction
This project aims to design a simple distance monitoring system using an ultrasonic sensor, an Arduino microcontroller, an LCD display, and an LED indicator. The system detects how far an object is from the sensor and shows the value on the LCD screen. Based on the measured distance, the LED turns ON or OFF to provide a visual alert. This project demonstrates the practical use of sensors and microcontrollers in real-time monitoring applications.
- Components Used
-->Arduino Uno -->Ultrasonic Sensor (HC-SR04) -->16×2 LCD Display with I2C Module -->LED -->Jumper Wires
- Methodology
The project works by placing the ultrasonic sensor in front of the area where the distance has to be measured. The sensor emits ultrasonic waves, and when these waves hit an object, they bounce back to the sensor. The Arduino calculates the distance based on the time taken for the waves to return.
The measured distance is then displayed on the LCD screen in centimetres. At the same time, the distance is also printed on the serial monitor for monitoring and debugging purposes. If the object comes within a preset range (for example, less than 10 cm), the LED turns ON to indicate that the object is too close. Otherwise, the LED remains OFF.
- Circuit Overview
The ultrasonic sensor is connected to the Arduino through trigger and echo pins. The LCD uses an I2C module, which reduces wiring and makes the display easy to interface. An LED is connected through a resistor to indicate proximity alerts. All components are mounted on a breadboard for testing and demonstration.
- Results
The system successfully measured the distance of objects placed in front of the sensor. The LCD clearly displayed the real-time distance, and the LED responded accurately whenever the object was detected within the defined threshold. The serial monitor also confirmed the readings, proving that the system worked reliably and consistently.
- Applications
-->Obstacle detection -->Smart parking assistance -->Industrial automation -->Robotics -->Safety alert systems -->Contactless measurement tools
- Conclusion
This project demonstrates how sensors, displays, and microcontrollers can be integrated to build a simple yet effective distance measurement and alert system. It provides hands-on experience with real-time sensing and output handling. The setup is easy to build and can be further expanded into more advanced applications such as autonomous robots or intelligent monitoring systems.