HC-SR04 Arduino Ultrasonic Module HC-SR04 Distance Sensor

Overview
This module performance is stable, measure the distance accurately. It can compare with the abroad ultrasonic measuring module SRF05, SRF02, etc. The module is high precision and nearly blind alleys (2cm), this product successful to the market, because of its stable measuring.

Parameters

1.Working Voltage: DC 5V

2.Static current: less than 2mA

3.Lever output: more than 5V

4.Lever input: less than 0V

5.Sensor angle: not more than 15 degrees

6.Detection distance: 2cm-450cm

7.High precision: better than 2mm

Mode of connection: VCC、trig(T)、echo(R)、GND

Working Principle

1.Adopt IO trigger through supplying at least 10us sequence of high level signal.

2.The module automatically send eight 40khz square wave and automatically detect whether receive the returning pulse signal.

3.If there is signals returning, through outputting high level and the time of high level continuing is    the time of that from the ultrasonic transmitting to receiving. Test distance = (high level time * sound velocity (340M/S) / 2.  

This module provides a full range of ranging process:
C51, PIC18F877 ultrasonic LCD1602 displays, ultrasonic LCD12864 display, digital display, serial display, ranging reference program.