ultrasonic sensor

Ultrasonic Sensor

HC-SR04

An ultrasonic sensor is used to measure the distance to an object using sound waves. It provides measurements of the time that takes the sound to fling something and return it to the sensor.

It works on sound wave frequency like sonar. The ultrasonic sensor also cannot detect some objects.

HC-SR04 ultrasonic can measure a range of 2 cm to 400 cm (4 m).

This sensor has 2 openings on its front. One is the transmitter which transmits ultrasonic waves like a speaker and the other is a receiver that receives them like a microphone.

Mainly ultrasonic sensors operations are not affected by sunlight or black material, but acoustically, soft materials like cloth can be difficult to detect.

ultrasonic sensor

Hardware Connections

-->  Vcc to 5V

-->  Gnd to Gnd

-->  Trig to digital pin 13

-->  Echo to digital pin 12

Specifications

Board Size 43 x 20 x 15 mm
Working voltage 5V DC
Operating voltage 5V DC
Working Frequency 40Hz
Range 2 cm to 400 cm (4 m)
Measuring Angle 15 degree
Trigger Input Signal 10 μs TTL pulse
Echo Output Signal Input TTL lever signal and the range in proportion

Uses of Ultrasonic Sensor

  • For Measuring Distance.
  • Robotic sensing.
  • Vehicle detection for car wash and automotive assembly.
  • Use in Parking Areas.
  • Presence detection.

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