HC-SR04 Ultrasonic Sensor
The HC-SR04 ultrasonic sensor is a widely used module for measuring distance in a variety of electronic projects, especially in robotics and automation. It uses ultrasonic waves to detect objects and measure their distance by emitting a high-frequency sound pulse and measuring the time it takes for the pulse to bounce back after hitting an object. The sensor operates with two main components: a transmitter that emits the sound wave, and a receiver that listens for the returning echo.
The HC-SR04 sensor has two key pins for communication: the Trigger pin and the Echo pin. To measure distance, a microcontroller (like an Arduino) sends a short pulse to the Trigger pin, which activates the sensor to emit the ultrasonic pulse. The sensor then measures the time taken for the echo to return to the receiver and calculates the distance based on the speed of sound in air.
The HC-SR04 sensor typically has a detection range of 2 cm to 400 cm, with an accuracy of about 3 mm. It provides an analog output that corresponds to the time delay, which can be converted into distance. The sensor is very popular in robotics for obstacle avoidance, object detection, and even in distance measuring applications for home automation and security systems due to its low cost and ease of use. However, its performance can be affected by environmental conditions such as temperature and humidity.
The HC-SR04 sensor has two key pins for communication: the Trigger pin and the Echo pin. To measure distance, a microcontroller (like an Arduino) sends a short pulse to the Trigger pin, which activates the sensor to emit the ultrasonic pulse. The sensor then measures the time taken for the echo to return to the receiver and calculates the distance based on the speed of sound in air.
The HC-SR04 sensor typically has a detection range of 2 cm to 400 cm, with an accuracy of about 3 mm. It provides an analog output that corresponds to the time delay, which can be converted into distance. The sensor is very popular in robotics for obstacle avoidance, object detection, and even in distance measuring applications for home automation and security systems due to its low cost and ease of use. However, its performance can be affected by environmental conditions such as temperature and humidity.
