Ultrasonic Sensor (HC-SR04)

The UltraSonic Sensor (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 2cm to 400cm. The sensor is widely used in robotics, obstacle avoidance systems, and various DIY electronics projects.

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

Usage:

1. 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.
2. 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).
3. 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.