Arduino Ultrasonic Sensor GH-311

1.Specification：

• Voltage : 6-12V(DC)
• Current : max 2mA
• Output Signal : 0-5V (Output high when obstacle in range)
• Sentry Angle : max 15 degree
• Sentry Distance : 2-8000mm
• Pin : 3pin 

2.Usage：

• Supply module with 6-12V, the output will be 5V while obstacle in range, or 0V if not.
• The out pin of this module is used as a switching output when anti-theft module, and without the feet when ranging modules,
• Note : the module should be inserted in the circuit before been power, which avoid producing high level of misoperation ï¼›if not, then power again.
• Module 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,

3.Advantage:

• Simple，easy to adopt in system ;  Beam angle to avoid disruptions;Endurable.

4.Notice:

• This module can not be used for distance measurement.