HC-SR04 Ultrasonic Sensor Distance Measuring Module

Model: HC-SR04 ​- Color: Blue + Silver ​- Working voltage : 5V(DC) ​- Static current: Less than 2mA. ​- Output signal: Electric frequency signal, high level 5V, low level 0V. ​- Sensor angle: Not more than 15 degrees. ​- Detection distance: 2cm~450cm. ​- High precision: Up to 3mm ​- Mode of connection: VCC / trig(T) / echo(R) / GND ​- 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 signals returning, through outputting high level and the time of high level continuing is the time of that from the ultrasonic transmitting to receiving