The HC-SR04 Ultrasonic Sensor is the most widely used distance measuring sensor module in Arduino builds worldwide, measuring distances from 2cm to 450cm using 40kHz ultrasonic sound pulses with a 15° beam angle, operating at 5V DC with a peak current of 15mA and an average current of only 2mA during normal operation. The hc sr04 ultrasonic sensor communicates through two pins — Trig and Echo — sending a 10-microsecond HIGH pulse on Trig triggers the ultrasonic sensor hc sr04 to emit an 8-cycle 40kHz burst, and the Echo pin then goes HIGH for a duration proportional to the round-trip travel time of the sound pulse.
The ultrasonic sensor datasheet, distance calculation from the Echo pulse is: Distance (cm) = Echo pulse width (µs) / 58 — dividing the pulse duration in microseconds by 58 gives centimetres directly without requiring knowledge of the speed of sound separately. The ultrasonic sensor hc sr04 range of 2cm to 450cm covers virtually all indoor and outdoor distance measurement needs for robot navigation, tank level monitoring, and parking sensors in Indian college electronics projects. The ultrasonic sensor module 45mm x 20mm x 15mm PCB with twin 16mm transducers mounts directly on robot chassis and project enclosures using standard M3 holes or adhesive tape.
the ultrasonic sensor 15° beam angle means the HC-SR04 measures the closest object within the cone — in cluttered environments with multiple objects at different distances, the sensor returns the nearest reflection rather than a specific target, requiring software filtering for reliable single-target tracking. Available from StemVolt, this ultrasonic sensor is suitable for makers and enthusiasts creating robotics, object detection, and smart automation projects, providing accurate distance measurement capabilities for a wide range of embedded applications.
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Features:
- 2cm to 450cm range covers indoor and outdoor distance builds
- 40kHz ultrasonic pulse with 15° beam angle Trig-Echo interface
- Average 2mA current suits always-on battery powered distance builds
- Distance formula: Echo µs divided by 58 gives centimetres directly
- 45mm x 20mm PCB with 16mm transducers fits standard robot chassis
Pin Diagram of HC-SR04 Sensor:
Technical specifications:
 Applications:
- HC-SR04 Sensor used for Arduino robot obstacle detection distance build
- Uses of hc sr04 ultrasonic sensor for distance meter demo
- Water tank uses ultrasonic sensor hc sr04 for level monitoring build
- Parking sensor uses ultrasonic sensor module for proximity alert system
- Blind stick prototype uses ultrasonic sensor for obstacle detection
Package includes:
- 1 x HC-SR04 Ultrasonic Sensor
Kalyani Menon –
Favourite online store
Rajeev Bhardwaj –
Loved it
Shalini Ranawat –
Fast shipping service
Subhendu Agarwal –
This ultrasonic sensor provides accurate distance measurement and reliable obstacle detection, making it ideal for ATL lab projects, robotics, automation, and STEM learning applications.
Mukesh Deshpande –
Value for money
Girish Aswani –
Perfect condition received