#1643: HC-SR04 Ultrasonic Distance Measuring Sensor Module

R36.27

The HC-SR04 Ultrasonic ranging module will allow you to detect whether there are obstacles in the way at a specified distance.

Simply supply the module with 5V and the output will be 5V while an obstacle is in range, or 0V if not in range. Specific ranges can be detected using specific timings. 

• Module Working Principle:
• 1.Adopt IO trigger through supplying at least 10us sequence of high level signals.
• 2.The module will automatically send eight 40khz square wave and automatically detect whether it received
• the returning pulse signal.
• 3.If there is signal returning, the output will be HIGH,
• Test distance = (high level time * sound velocity (340M/S) / 2.

An instructable tutorial on how to use the HC-SR04 module with an Arduino can be found at: https://howtomechatronics.com/tutorials/arduino/ultrasonic-sensor-hc-sr04/