Sonar Sensor HC SR04

Description of Sonar Sensor HC SR04

HCSR04 is an Ultrasonic ranging module which consists of a transmitter,receiver and control circuit. It has four pins for VCC, GND, Trigger and Echo.You can easily interface it with micrcontrollers and Arduino boards.

The basic principle of work is:

(1) Using IO trigger for at least 10us high level signal,

(2) The Module automatically sends eight 40 kHz and detect whether there is a

pulse signal back.

(3) IF the signal back, through high level , time of high output IO duration is

the time from sending ultrasonic to returning.

Test distance = (high level time×velocity of sound (340M/S) / 2

Specification of Sonar Sensor HC SR04

• Working Voltage DC 5 V
• Working Current 15mA
• Working Frequency 40Hz
• Max Range 4m
• Min Range 2cm
• Measuring Angle 15 degree
• Trigger Input Signal 10uS TTL pulse
• Echo Output Signal Input TTL lever signal and the range in proportion
• Dimension 452015mm