What is an Ultrasonic Sensor ?

Well,  In these days mostly everywhere keep listening to this word popularly, that is a robot. How the robot will work and how the robot will sense it's surroundings, how the robot supposes to detect an object. For all these questions might be clear in this podcast. 

    Today's podcast we will discuss on an ultrasonic sensor, what it is, what is the usage in robot and working.

 What is Ultrasonic Sensor:

    An ultrasonic sensor is an electronic device. The name showing itself meaning this sensor will measure the distances of an object based on the ultrasonic or sound waves.



Pin Description:

 Pin 1: VCC

   The Vcc pin powers the sensor, typically with +5v.

Pin 2: Trigger

   The trigger pin is an input pin. This pin has to be kept high for 10us to initialize measurement by sending US waves.

 Pin 3:  Echo

   Echo pin is an output pin. This pin goes for a period of time which will be equal to the time taken for the US wave to return back to the sensor.

Pin 4: Ground

   Pin connected to the ground of the system.

 Ultrasonic Sensor working:

     An ultrasonic sensor is a 4 pin module, This sensor is a very popular sensor used in many applications where measuring the distance of sensing objects are required. the module has two eyes like projects in the front which forms the ultrasonic transmitter and receiver. The formula has given below.

Distance = 1/2 x T x C

                                                           Where T is time between the emission and reception.
                                                                       C is a speed of sound or sonic waves.

  The ultrasonic transmitter transmits an ultrasonic wave, this wave travels in the air and when it gets objected by any material it gets reflected back towards the sensor this reflected wave is observed by the ultrasonic receiver module as shown in the picture below.

Ultrasonic Sensor Working


This sensor is most commonly using a sensor for robotics like obstacle avoidance robot, path following robot etc.





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