HC-SR04 Ultrasonic Distance Sensor

Measure distances with precision using the HC-SR04 Ultrasonic Sensor - the go-to module for robotics, obstacle avoidance, and automation projects. Available now from The Tech Depot, Bengaluru, with fast shipping and full technical support.

Specifications

How It Works

The HC-SR04 uses ultrasonic sound waves to calculate distance. Send a 10 us HIGH pulse to the Trig pin - the module emits eight 40 kHz bursts, then the Echo pin goes HIGH for a duration proportional to the round-trip time of the sound wave. Use the formula Distance = (Echo pulse width x Speed of sound) / 2 to convert the reading into centimeters or inches. Most Arduino libraries handle this automatically in a single line of code.

Pin Configuration

Why Choose the HC-SR04 from The Tech Depot?

• 100% authentic modules sourced from trusted, authorized suppliers
• Reliable +/-3 mm accuracy across a 2 cm - 400 cm range
• Plug-and-play with Arduino, Raspberry Pi, ESP32, and virtually any microcontroller
• Massive community support - thousands of tutorials, libraries, and code examples available online
• 1-5 day shipping, 7-8 day delivery from our Bengaluru warehouse; same-day delivery within Bengaluru
• Expert technical support included to help you wire, code, and troubleshoot

Project Ideas

• Obstacle-Avoiding Robot: Mount the sensor on a servo to scan surroundings and navigate autonomously.
• Smart Parking System: Detect whether a parking slot is occupied and display availability on an LCD or web dashboard.
• Water Level Monitor: Place the sensor above a tank to measure water level without contact and trigger alerts or pump control.
• Digital Measuring Tape: Build a handheld distance meter with an OLED display for quick, contactless measurements.
• Gesture / Proximity Control: Map hand distance to volume, brightness, or motor speed for touchless interfaces.
• Security & Intruder Alert: Trigger a buzzer or notification when an object enters a defined zone.
• Learning & Education: Ideal first sensor project for students - simple wiring, easy code, and instant visual results.

Quick-Start Arduino Example

Wire VCC -> 5V, GND -> GND, Trig -> Digital Pin 9, Echo -> Digital Pin 10, then upload:

#define TRIG 9
#define ECHO 10

void setup() {
 Serial.begin(9600);
 pinMode(TRIG, OUTPUT);
 pinMode(ECHO, INPUT);
}

void loop() {
 digitalWrite(TRIG, LOW);
 delayMicroseconds(2);
 digitalWrite(TRIG, HIGH);
 delayMicroseconds(10);
 digitalWrite(TRIG, LOW);

long duration = pulseIn(ECHO, HIGH);
float distance_cm = duration * 0.0343 / 2.0;

 Serial.print("Distance: ");
 Serial.print(distance_cm);
 Serial.println(" cm");
 delay(500);
}

What's in the Box

Frequently Asked Questions

Buy HC-SR-04 Ultrasonic Sensor Online in India

Purchase the HC-SR-04 Ultrasonic Sensor online at The Tech Depot - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on HC-SR-04 Ultrasonic Sensor with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.

Looking to buy HC-SR-04 Ultrasonic Sensor at the best price in India? The Tech Depot offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.