. Brand new Ultrasonic Sensor HC-SR04 Distance Measuring Module
. Features 4-mode connections: VCC / trig (T) / echo(R) / GND
. With electric frequency output signal from 0V to 5V
. Has high precision up to 3mm
. 5VDC power supply
. Detecting distance is from 2cm to 450cm
. Module Working Principle:
Adopt IO trigger through supplying at least 10us sequence of high level signal;
The module automatically send eight 40khz square wave and automatically detect whether receive the returning pulse signal;
If there is signal returning， through outputting high level and the time of high level continuing is the time of that from the ultrasonic transmitting to receiving

. Model: HC-SR04
. Static Current: Less than 2mA
. Sensor Angle: Not more than 15 degrees
. Output Signal: Electric frequency signal， high level 5V， low level 0V
. Mode of Connection: VCC / Trig (T) / Echo(R) / GND