HC-SR04 Ultrasonic Sensor for Arduino

The HC-SR04 ultrasonic sensor adds distance measurement to your Arduino project. It sends ultrasonic pulses towards an object and detects the returning echo. Your controller uses the echo timing to calculate the distance between the sensor and the target.

This module is useful for students, hobbyists, and electronics makers in Pakistan. Whether you are assembling a robot car or preparing a classroom demonstration, it provides a practical introduction to distance sensing and microcontroller programming.

Features and Specifications

The stated range is nominal. Small, angled, or sound-absorbing objects can produce weaker echoes and less consistent readings.

Applications for the HC-SR04 Ultrasonic Sensor

Use this module in obstacle-detection robot cars, distance displays, and proximity-triggered experiments. It also suits school and university projects that explore timing, sensors, and automation.

For example, an Arduino can read the sensor and activate a buzzer when an object moves within a programmed distance. In a robot car, the controller can use those readings to decide when to stop or turn. Motors, drivers, displays, and other output devices require separate components and suitable code.

Arduino Connections

For an Arduino Uno R3 or classic 5V Nano, a simple example connection is:

Set the same Trigger and Echo pins in your program. Disconnect power while making connections and check the labels printed on the module.

The standard module’s Echo output uses 5V logic. When connecting it to an ESP32, Raspberry Pi, or another 3.3V controller, use appropriate level shifting or a voltage divider on Echo. Check the electrical requirements of your specific controller before wiring.

Mounting and Measurement Tips

Position the sensor so both round transducers face the intended detection area. Keep nearby wires and chassis parts clear of its front. A compatible HC-SR04 bracket can help maintain its position during testing.

Begin with a broad, flat target and compare readings at several known distances. Allow time between measurements and handle missing echoes in your program. These steps help you identify wiring problems and understand how different surfaces affect detection.

Buy an Arduino Ultrasonic Sensor in Pakistan

Choose the HC-SR04 ultrasonic sensor from Mekatroniks for your next robotics or electronics project in Pakistan. Check the current price, stock status, and package contents on the product page, then select the controller and accessories required for your build.