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- 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 it receive the returning pulse signal
A good tutorial available at ModMyPi. http://www.modmypi.com/blog/hc-sr04-ultrasonic-range-sensor-on-the-raspberry-pi Read the Docs Note: Stock is currently available in South Africa for national shipping!