The HC-SR04 Ultrasonic Sensor Detector offers precise distance measurement from 2–400 cm with high accuracy, perfect for robotics and automation projects.
The HC-SR04 Ultrasonic Sensor Detector 3.3V-5V is a highly reliable and widely used distance measuring module ideal for robotics, automation, and obstacle detection projects. Operating within a voltage range of 3.3V to 5V, it offers excellent compatibility with microcontrollers such as Arduino, Raspberry Pi, and other development boards. Using ultrasonic waves, it can accurately detect objects and measure distances typically ranging from 2 cm up to 400 cm, with a precision of about 3 mm. The module features a transmitter and receiver pair that sends and detects ultrasonic pulses, calculating the time delay to determine the distance to an object. Compact, lightweight, and easy to integrate, the HC-SR04 is a cost-effective solution for applications such as smart robots, distance monitoring, automatic parking systems, and object avoidance technologies.
Features
Wide Operating Voltage Works with both 3.3V and 5V, compatible with Arduino, Raspberry Pi, and other controllers.
Long Range Detection Measures distances from 2 cm up to 400 cm (4 meters).
High Accuracy Offers a measurement accuracy of approximately ±3 mm.
Simple Interface Uses standard Trigger and Echo pins for easy integration.
Compact Design Lightweight and small, ideal for robotics and embedded systems.
Low Power Consumption Efficient operation suitable for battery-powered projects.
Versatile Applications Perfect for obstacle avoidance, distance measurement, object detection, and automation systems.
Specifications
Specification
Details
Operating Voltage
3.3V – 5V
Operating Current
15 mA
Operating Frequency
40 kHz
Measuring Range
2 cm – 400 cm
Accuracy / Resolution
±3 mm
Trigger Input Signal
10 µs TTL pulse
Echo Output Signal
TTL pulse, proportional to distance
Measuring Angle
< 15°
Sensor Dimensions
45mm X 20mm X 15mm
Effective Output
Pulse width corresponds to distance
Communication Interface
Trigger (input) & Echo (output) pins
Compatibility
Arduino, Raspberry Pi, Microcontrollers
Pinout
Pin Number
Pin Name
Description
1
Vcc
The Vcc pin powers the sensor, DC3.3-5V
2
Trigger
Trigger pin is an Input pin. This pin has to be kept high for 10us to initialize measurement by sending US wave.
3
Echo
Echo pin is an Output pin. This pin goes high for a period of time which will be equal to the time taken for the US wave to return back to the sensor.
4
Ground
This pin is connected to the Ground of the system.
TX/RX Lines: Level shifting may be required if interfacing with a 3.3V system. Use a voltage divider (typically 1kΩ and 2kΩ resistors).
Ensures the voltage levels between the HC-SR04 and microcontroller are compatible (for UART communication).
1-WIRE Interface
Data Line: 4.7kΩ pull-up resistor between data line and supply voltage.
Required to ensure reliable communication over the 1-WIRE data line.
Functionality of HC-SR04 Ultrasonic Sensor
Distance Measurement: The HC-SR04 sensor uses ultrasonic sound waves to measure the distance to an object. The sensor emits a pulse via the Trigger Pin. The pulse travels, hits an object, and returns to the sensor, which detects it through the Echo Pin. The time taken for the echo to return is proportional to the distance.
Drawing
Applications
Robotics & Drones.
Smart Vehicles.
Industrial Automation.
Security Systems.
IoT Projects.
Educational Kits.
DIY Electronics.
Package Contents
1 x HC-SR04 Ultrasonic Sensor Detector 3.3V-5V
Ultrasonic Sensor Holder
Color
Blue, Light Blue
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