HC-SR04 Ultrasonic Distance Sensor Module – High Precision Sonar for Arduino, Raspberry Pi & Robotics in Pakistan

Overview 

The HC-SR04 Ultrasonic Sensor is a reliable and low-cost module for non-contact distance measurement. It uses the same principles as radar or sonar—emitting a 40kHz sonic burst and calculating the time it takes to return. Because it uses sound rather than light, it is unaffected by sunlight or the color of the object it’s measuring (though soft fabrics can absorb the sound). It’s the “must-have” sensor for every robotics student and DIY enthusiast.

Key Features

• Long Range Sensing: Detects objects from as close as 2cm up to a massive 400cm (4 meters).

• High Precision: Offers stable readings with an accuracy of up to 3mm.

• 4-Pin Interface: Uses a simple Trigger (Input) and Echo (Output) system that is easy to code.

• Wide Compatibility: Works perfectly with Arduino (via the NewPing library), ESP32, Raspberry Pi, and STM32.

• Low Power Consumption: Draws very little current, making it ideal for battery-powered smart cars.

Technical Specifications 

Feature	Specification
Operating Voltage	5V DC
Operating Current	15mA
Ultrasonic Frequency	40kHz
Max Range	4m (400cm)
Min Range	2cm
Measuring Angle	15 Degrees
Trigger Input Signal	10µS TTL pulse
Dimensions	45mm x 20mm x 15mm