Sonar Sensor HC SR04

In Stock (Ready to Dispatch)

99.00৳

Inside Dhaka: ৳80 (Delivered within 24–48 hours)

Across Bangladesh: ৳130 (Steadfast / Redx / SA Paribahan courier)

Cash on Delivery: Pay when parcel is delivered to your door.

The HC-SR04 Ultrasonic Sensor is an essential component for robotics and automation, available at RoboShop BD. Using the same sonar principles as bats and dolphins, this module emits high-frequency sound waves to determine the distance to an object. With a stable detection range from 2cm to 400cm and an accuracy of 3mm, it is the industry standard for obstacle avoidance, liquid level sensing, and digital “tape measure” projects.

Description

How It Works: The Time-of-Flight Principle

The HC-SR04 consists of an ultrasonic transmitter, a receiver, and a control circuit. When triggered by a 10µs pulse, the transmitter sends out an 8-cycle burst of ultrasound at 40kHz. These waves travel through the air, bounce off an object, and return to the receiver. The “Echo” pin then outputs a high-level pulse whose duration is proportional to the time taken for the round trip. At RoboShop BD, we recommend this sensor for its immunity to sunlight and black-material interference, which often plagues infrared-based distance sensors.

Reliable and Easy to Interface

This sensor is remarkably easy to use with any microcontroller, including Arduino, ESP32, and Raspberry Pi. Because it operates on a standard 5V supply and consumes less than 15mA, it can be powered directly from your development board. Its compact, “two-eyed” design has made it a favorite for the global maker community, ensuring a vast library of open-source code and tutorials are available for your next build.

Key Features

Non-Contact Measurement: Detects objects without physical touch, preventing damage to delicate surfaces.
High Precision: Offers a resolution of 0.3cm and a ranging accuracy of up to 3mm.
Wide Detection Range: Reliable sensing from as close as 2cm up to 4 meters away.
4-Pin Interface: Simple wiring with VCC, Trig, Echo, and GND pins.
Sunlight Independent: Unlike IR sensors, its performance is not affected by ambient light or dark-colored objects.
Fast Response: High-speed measurement cycles (suggested >60ms) for real-time robotics.

Technical Specifications

Specification	Details
Operating Voltage	5V DC
Operating Current	15mA
Ultrasonic Frequency	40 kHz
Detection Range	2 cm – 400 cm
Measuring Angle	< 15° (Effectual) / 30° (Sensing)
Trigger Input Signal	10µs TTL Pulse
Echo Output Signal	TTL Pulse (Proportional to Distance)
Dimensions	45mm x 20mm x 15mm
Resolution	3 mm

Pinout Configuration

Pin	Name	Function
1	VCC	+5V Power Supply
2	Trig	Trigger Input (10µs pulse starts measurement)
3	Echo	Echo Output (High pulse duration = time of flight)
4	GND	System Ground