HC-SR04 Ultrasonic Module for Arduino – Obstacle Detection & Range Finder

Original price was: ₹199.00.Current price is: ₹140.00.

The HC-SR04 Ultrasonic Sensor is a popular distance-measuring device that uses ultrasonic waves to determine the distance to an object. It’s widely used in robotics, obstacle avoidance systems, and other proximity-sensing applications.

Discount	Quantity	Price/Pc
Starter Savings	5 - 10	5% ₹133.00
Value Savings	11 - 20	10% ₹126.00
Maximum Savings	21 - 50	15% ₹119.00

Key Features

Operating Voltage: 5V DC
Measuring Range: 2cm – 400cm (~4m)
Accuracy: ~3mm
Operating Frequency: 40kHz
Trigger Input Pulse Width: 10µs
Echo Pulse Output: Proportional to distance

Pin Configuration

Pin	Function
VCC	5V Power Supply
Trig	Trigger (Input) – Sends ultrasonic pulse
Echo	Echo (Output) – Receives reflected pulse
GND	Ground

How It Works

Trigger Pulse: Send a 10µs HIGH pulse to the Trig pin.
Ultrasonic Burst: The sensor emits an 8-cycle ultrasonic burst at 40kHz.
Echo Pulse: The Echo pin goes HIGH until the reflected sound is detected.
Distance Calculation:
- Measure the duration of the HIGH pulse on Echo.
- Distance (cm) = (Echo Pulse Time × Speed of Sound) / 2
  - Speed of sound ≈ 343 m/s (or 0.0343 cm/µs)
  - Formula: Distance (cm) = (Pulse Time (µs) × 0.0343) / 2
  - Simplified: Distance = Pulse Time / 58 (for cm)