This sensor (HC-SR04) measures the distance up to 4 meters. This module performance is stable, measures the distance accurately. The performance of this module is nearly the same as SRF05, SRF02 SRF05, SRF02 ultrasonic distance measuring module and other comparable. This ultrasonic sensor works as following:
- Using IO trigger distance, send a high signal to at least 10us.
- The sensor automatically sends eight 40khz square wave and automatically detects whether an object exist in the range and return a signal.
- The returned signal from the object is read by the echo pin in the sensor.
Main technical parameters:
- Voltage: DC 5V
- Static current: less than 2mA
- Electrical level output: 5V high
- Electrical level output: at the end of 0V.
- Induction angle: not more than 15 degrees.
- Detection distance: 2cm-450cm.
- High precision: 2mm
- Wiring: VCC, trig (control side), echo (receiving end), GND