• Working Voltage: 5V(DC)
  • 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

An ultrasonic distance sensor is a sensor that can measure distance from a solid or physical object.

An ultrasonic range finder does this through sound waves.

It sends out high-frequency sound waves and then waits to listen back for these sound waves. If it has heard back these sound waves, then this means the sound waves have bounced off of a physical object and has come back to the sensor, which means a physical object is present in front of the sensor. If it does not hear back these sound waves, this means that no physical object has been detected.

The ultrasonic sensor we will use is the very cheap and popular HC-SR04 sensor. We will integrate this sensor with an arduino for a very good object detection system.