HC-SR04

The HC-SR04 ultrasonic sensor from CHINA utilizes sonar technology to measure distances to objects, similar to how bats and dolphins navigate. It provides excellent non-contact range detection with high accuracy and stable readings in an easy-to-use package.

This sensor operates with a 5V DC power supply and has a quiescent current of less than 2mA, with a working current of 15mA. Its ranging capability extends from 2cm up to 400cm (approximately 1 inch to 13 feet). The sensor emits ultrasonic bursts at 40kHz and measures the time it takes for the reflected sound to return, allowing for distance calculation. The resolution is 0.3cm, and it has an effectual angle of less than 15 degrees and a measuring angle of 30 degrees.

The HC-SR04 is not affected by sunlight or dark materials, making it versatile for various applications. However, acoustically soft materials like cloth can be challenging to detect. The module includes both an ultrasonic transmitter and receiver. Its dimensions are 45mm x 20mm x 15mm, making it compact for integration into projects.

Key specifications include an operating voltage range of 4.5V to 5.5V and a trigger input pulse width requirement of 10µS. The sensor is designed for ease of use, with Trig and Echo pins for triggering measurements and receiving the echo pulse width, respectively.