Ultrasonic sensor HC-SR04 HC-SR04 Ultrasonic Distance Measurer Sensor for Arduino Uno MEGA2560 Robot XBee ZigBee Raspberry Pi. Ultrasonic distance measurement from 2cm up to 450cm with an accuracy of approx. 3mm. Power supply: 5V DC. Quiescent current: less than 2mA.             Characteristics Voltage: DC5V. Static current: less than 2mA. Level Output: High 5V. Output level: the end of 0V. sensor angle: no more than 15 degrees. Detection distance: 2cm-450cm. High precision: up to 0.3cm. Connection: VCC, triglyceride (control side), echo (receiving end), GND.