The HC-SR04 is an affordable and easy-to-use ultrasonic distance sensor. It measures the distance to an object by using sonar technology and provides accurate distance measurements from 2 cm to 400 cm. The sensor is widely used in robotics, obstacle avoidance systems, and various DIY electronics projects. Key Features:
- Ultrasonic ranging module
- High precision and stable performance
- Simple pulse-in/pulse-out communication
- Measurement range: 2 cm to 400 cm
- Accurate to ±3 mm
- Low power consumption
- Easy integration with microcontrollers (Arduino, Raspberry Pi, etc.)
Technical Specifications:
- Operating Voltage: 5V DC
- Quiescent Current: < 2 mA
- Working Current: 15 mA
- Measurement Range: 2 cm to 400 cm
- Resolution: 1 cm
- Measuring Angle: 15 degrees
- Trigger Input Pulse Width: 10 µs
- Echo Pulse Width: Proportional to distance
- Dimensions: 45mm x 20mm x 15mm
Applications:
- Obstacle avoidance systems
- Distance measuring
- Object detection
- Autonomous navigation for robots
- Liquid level measurement
- Proximity sensing
Usage:
- Connection:
- Connect the VCC pin to a 5V power supply.
- Connect the GND pin to ground.
- Connect the Trig (Trigger) pin to a digital output pin on the microcontroller.
- Connect the Echo pin to a digital input pin on the microcontroller.
- Operation:
- To initiate a measurement, send a 10 µs high pulse to the Trig pin.
- The sensor will emit an 8-cycle burst of ultrasound at 40 kHz and set the Echo pin high.
- Measure the duration for which the Echo pin remains high to calculate the distance to the object (distance = duration * 0.034 / 2).
- Programming:
- Write a program on the microcontroller to send the trigger pulse, read the echo pulse duration, and calculate the distance.
- Many microcontroller platforms, such as Arduino, have libraries available to simplify interfacing with the HC-SR04.
Caution:
- Avoid using the sensor in environments with excessive noise or strong ultrasonic interference.
- Handle the sensor with care to avoid damage to the ultrasonic transducers.
- Ensure proper connections to avoid incorrect readings or damage to the sensor.
Datasheet: For detailed technical specifications, refer to the HC-SR04 Datasheet.
