Descriptions

The HC-SR04 provides 2cm - 400cm of non-contact measurement function with an accuracy of 0.3cm. The module includes ultrasonic transceiver and works by triggering the Trigger pin of sensor with a pulse of HIGH state for at least 10kHz. The sensor will in turn transmit an ultrasonic burst and wait for a reflected ultrasonic burst. When the reflection is detected, the Echo pin will be set to HIGH state for a certain period which proportion to distance.

Technical details

-          Flexible input voltage of 3V to 5.5V

-          Effective range of 2cm to 450cm (5V)

-          Effective range of 2cm to 400cm (3.3V)

-          Effective angle of < 15 degree.

-          Operating temperature of -20 to 80 degree C