USER'S GUIDE

 

 

GH-311Ultrasound Motion Sensor 

The GH-311 ultrasonic Motion sensor provides precise, non-contact distance 

measurements from about 2 cm (0.8 inches) to 3 meters (3.3 yards). It is very easy to 

connect to microcontrollers such as the BASIC Stamp®, SX or Propeller chip, requiring 

only one I/O pin. 

 

The GH-311 sensor works by transmitting an ultrasonic (well above human hearing 

range) burst and providing an output pulse that corresponds to the time required for the 

burst echo to return to the sensor. By measuring the echo pulse width, the distance to 

target can easily be calculated. 

 

 

 

Pin Definitions: 

 GND Ground (Vss), 

 5 V 5 VDC (Vdd) 

 SIG Signal (I/O pin) 

 

The GH-311 sensor has a male 3-pin header used to supply ground, power (+5 VDC) and 

signal. The header may be plugged into a directly into solder less breadboard, or into a 

standard 3- wire extension cable 

 

Communication Protocol 

The GH-311 sensor detects objects by emitting a short ultrasonic burst and then listening" 

for the echo. Under control of a host microcontroller (trigger pulse), the sensor emits a 

short 40 kHz (ultrasonic) burst. This burst travels through the air, hits an object and then 

bounces back to the sensor. The GH-311 sensor provides an output pulse to the host that 

will terminate when the echo is detected, hence the width of this pulse corresponds to the 

distance to the target

 

 

 

 

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