HC-SR04 Ultrasonic Sensor Features, Datasheets, and Applications

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HC-SR04 Ultrasonic Sensor Features, Datasheets, and Applications

This low-cost sensor provides a non-contact measurement range of 2cm to 400cm with a ranging accuracy of up to 3mm. Each HC-SR04 module has an ultrasonic transmitter, a receiver, and a control circuit.

General Description

This inexpensive sensor has a range of 2cm to 400cm of non-contact measuring capability and a ranging accuracy of up to 3mm. An ultrasonic transmitter, a receiver, and a control circuit are all included in each HC-SR04 module.

On the HC-SR04, you just need to care about four pins: VCC (Power), Trig (Trigger), Echo (Receive), and GND (Ground) (Ground). You'll find it simple to set up and utilize this sensor for your next range-finding project. Depending on the application, this sensor contains extra control circuitry that can avoid inconsistent "bouncy" data.

Features

The Module transmits eight 40 kHz and detects if there is a pulse signal back using IO trigger for at least 10us high-level signal.
The Module sends eight 40 kHz and detects whether there is a pulse signal back using IO trigger for at least 10us high-level signal.
If the signal returns at a high level, the period of high output IO duration is the time between transmitting and receiving ultrasonic.

(high level temporal velocity of sound (340M/S) / 2 = test distance.