HC-SR-04 Ultrasonic Sensor
HC-SR-04 Ultrasonic Sensor
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Looking to buy HC-SR-04 Ultrasonic Sensor at the best price in India? Tech Depot India 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.
Specifications
| Module | HC-SR04 Ultrasonic Ranging Sensor |
| Operating Voltage | 5V DC |
| Operating Current | 15 mA (typical) |
| Measuring Range | 2 cm - 400 cm (0.8 in - 13 ft) |
| Accuracy | +/-3 mm |
| Measuring Angle | <=15 degrees effective cone |
| Ultrasonic Frequency | 40 kHz |
| Trigger Input Signal | 10 us TTL pulse |
| Echo Output Signal | TTL level pulse proportional to distance |
| Interface Pins | VCC, Trig, Echo, GND (4-pin header) |
| Board Dimensions | 45 mm x 20 mm x 15 mm (approx.) |
| Compatibility | Arduino, Raspberry Pi, ESP32, ESP8266, STM32, PIC & more |
| Origin | Original / Authentic Module |
Why Choose HC-SR-04 Ultrasonic Sensor?
100% Authentic
GST Invoice - A GST invoice is included with every order.
Expert Support - Dedicated technical help on WhatsApp and email.
Pan-India Delivery - Shipped across Bengaluru, Delhi NCR, Hyderabad and all of India.
Trusted by Makers - Used by students, hobbyists and professionals nationwide.
Key Features of HC-SR-04 Ultrasonic Sensor
- Reliable +/-3 mm accuracy across a 2 cm - 400 cm range
- Plug-and-play with Arduino, Raspberry Pi, ESP32, and virtually any microcontroller
Perfect For
- 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.
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 Tech Depot India, Bengaluru, with fast shipping and full technical support.
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
| VCC | +5V DC Power Supply |
| Trig | Trigger Input - send 10 us pulse to start measurement |
| Echo | Echo Output - returns pulse width proportional to distance |
| GND | Ground |
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
Is technical support available?
Yes, responsive support via email and WhatsApp for setup, troubleshooting, and application guidance.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Customer Support
Email: techdepotindia@gmail.com
WhatsApp: Available for setup and troubleshooting help
Order your HC-SR-04 Ultrasonic Sensor today and start building your next project.
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