1. Product feature HC-SR04 ultrasonic module can offer non-contact distance sensing function with the range of 2cm - 400cm. And the range accuracy is up to 2mm. This module includes ultrasonic transmitter, receiver and control circuit.
2. Module technical parameters Working Voltage : 5V(DC) Static current: Less than 2mA. Output signal: Electric frequency signal, high level 5V, low level 0V. Sensor angle: Not more tbhan 15 degrees. Detection distance: 2cm-450cm. High precision: Up to 0.3cm Input trigger signal: 10us TTL impulse Echo signal : output TTL PWL signal