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
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