66%

HC-SR04 Ultrasonic Module Distance Measuring Transducer Sensor DC 5V Distance Sensor Module 0.3cm Resolution

HC-SR04 Ultrasonic Module Distance Measuring Transducer Sensor DC 5V Distance Sensor Module 0.3cm Resolution

Name: HC-SR04 Ultrasonic Module Distance Measuring Transducer Sensor DC 5V Distance Sensor Module 0.3cm Resolution - Annai Electronics
Price: 139.00 INR
Availability: InStock

In Stock

~~₹399.00~~ ₹139.00

In Stock

Add to wishlist Compare

Category: sensors

An ultrasonic sensor is a device that measures the distance to an object using high-frequency sound waves. By emitting a sound pulse and measuring the time it takes for the echo to return, it calculates the exact distance. It is widely used in robotics, smart automation, and parking sensors

Description

These sensors operate on the Time-of-Flight (ToF) principle, using the following process:

1. Transmission: The sensor sends out a high-frequency acoustic wave (typically 40 kHz), which is above the range of human hearing.
2. Reflection: If the sound wave hits an obstacle or target, it bounces back toward the sensor as an echo.

Calculation: The sensor calculates distance (D) by multiplying the sound wave’s velocity (V) by the time (t) it took to return, divided by two (since the wave traveled to the object and back):
\(D = \frac{V \times t}{2}\)

The specifications of an ultrasonic sensor vary by model, but they are best highlighted by looking at the HC-SR04, which is the global standard for hobbyists, and industrial-grade sensors (like those from Baumer or Pepperl+Fuchs) used in automation.

Key Technical Specifications Comparison

Specification	Standard Hobbyist (HC-SR04)	Industrial-Grade Sensors
Operating Voltage	5 V DC	10 V to 30 V DC
Operating Current	15 mA	30 mA to 70 mA
Acoustic Frequency	40 kHz	65 kHz to 400 kHz
Detection Range	2 cm to 400 cm (4 m)	3 cm to 600 cm (6 m+)
Measurement Angle	Over 15°	Narrow (3° to 8°)
Resolution	0.3 cm	Up to 0.1 mm
Output Type	TTL Pulse (Digital Echo/Trigger)	Analog (4-20 mA / 0-10 V), IO-Link, PNP/NPN
IP Rating (Waterproof)	None (IP20)	High (IP67 / IP69K)

Critical Parameters Explained

- Blind Zone (Minimum Distance): The short distance directly in front of the sensor where it cannot calculate time-of-flight accurately. For hobby sensors, this is usually 2 cm, while industrial sensors can compress or calibrate this zone.
- Beam Angle / Sonic Cone: The area over which the sound wave spreads. A wide angle (15°) is great for general obstacle detection, while a narrow angle (5°) is required to avoid detecting sidewalls in tight spaces like tank lips.
- Temperature Compensation: Sound speed changes with air temperature (≈ 0.6 m/s per °C). Industrial specifications include an internal temperature sensor to automatically correct distance calculations, a feature hobby sensors lack

Pins and Electrical Interface (HC-SR04)

- VCC: Power input (5 V).
- Trigger (Trig): Input pin. Requires a 10 μs high pulse to trigger the sound burst.
- Echo: Output pin. Stays high for the exact duration it takes for the sound to travel to the object and return.
- GND: Ground connection (0 V).