Now, to calculate the distance using the above formulae, we should know the Speed and time. The Ultrasonic transmitter transmits an ultrasonic wave, this wave travels in air and when it gets objected by any material it gets reflected back toward the sensor this reflected wave is observed by the Ultrasonic receiver module as shown in the picture below The sensor works with the simple high school formula that

The module has two eyes like projects in the front which forms the Ultrasonic transmitter and Receiver. This sensor is a very popular sensor used in many applications where measuring distance or sensing objects are required. US transmitter Receiver pair, IR sensor module, IR sensor pair, IR Analog distance sensor,Īs shown above the HC-SR04 Ultrasonic (US) sensor is a 4 pin module, whose pin names are Vcc, Trigger, Echo and Ground respectively. More details can be found in the HC-SR04 ultrasonic sensor datasheet attached at the bottom of this article. Practical Measuring Distance: 2cm to 80cm.Theoretical Measuring Distance: 2cm to 450cm.This pin is connected to the Ground of the system. This pin goes high for a period of time which will be equal to the time taken for the US wave to return back to the sensor. This pin has to be kept high for 10us to initialize measurement by sending US wave.Įcho pin is an Output pin. The Vcc pin powers the sensor, typically with +5V

Ultrasonic sensor arduino