Ultrasonic Sensor HC-SR04

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: 2 cm to 450 cm

High Precision: Up to 2mm

Input Trigger Signal: 10us TTL impulse

Echo Signal: Output TTL PWL signal

Note: The module has a blind spot of 2cm (very near)

So obstacle held too closely will not be detected