Introduction: Ultrasonic Range Finder Using Arduino. Ultrasonic Range Finder is a simple method of calculating distance from an obstacle from a distance without any physical contact. It employs an ultrasonic distance sensor which uses sound pulses to measure distance.

Step 1: HC Sr04 (ultrasonic Sensor)

What Is Sensor ?

A sensor is a device, module, or subsystem whose purpose is to detect events or changes in its environment and send the information to other electronics

Types of Sensors

1.The most frequently used different types of sensors are classified based on the quantities such as

2.Electric current or Potential or Magnetic or Radio sensors

3.Humidity sensor

4.Fluid velocity or Flow sensors

5.Pressure sensors

6.Thermal or Heat or Temperature sensors

7.Proximity sensors

8.Optical sensors

9.Position sensors

!!!!!!! ULTRASONIC SENSOR IS A PROXIMITY SENSOR !!!!!!!!

An Ultrasonic sensor is a device that can measure the distance to an object by using sound waves. It measures distance by sending out a sound wave at a specific frequency and listening for that sound wave to bounce back.