The HC-SR04 Ultrasonic Sensor Module uses ultrasonic sound waves to measure distance between the sensor and an object. It works by transmitting ultrasonic pulses and measuring the time taken for the echo to return. This sensor is commonly used in robotics, automation, parking sensors, and obstacle detection systems. It is easy to interface with popular development boards such as Arduino Uno, Arduino Nano, and ESP32 Development Board. Because of its low cost, accuracy, and simple interface, it is one of the most popular sensors in electronics and embedded system projects. Key Features Non-contact distance measurement Measurement range: 2 cm to 400 cm High accuracy and stable performance Simple 4-pin interface Works with Arduino, ESP8266, ESP32, Raspberry Pi, etc. Low power consumption Technical Specifications Parameter Value Operating Voltage 5V Operating Current 15 mA Measuring Range 2 cm – 400 cm Accuracy ±3 mm Operating Frequency 40 kHz Interface Pins VCC, Trig, Echo, GND Pin Configuration Pin Description VCC Power Supply (5V) Trig Trigger input Echo Echo output GND Ground What’s in the Box 1 × HC-SR04 Ultrasonic Distance Sensor Module
