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Distance Calculation with Ultrasonic Sensor & Raspberry Pi #piday #raspberrypi @Raspberry_Pi

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Via Arbaz Hussain on hackster.io

HC-SR04 is a commonly used module for non-contact distance measurement for distances from 2cm to 400cm. It uses sonar (like bats and dolphins) to measure distance with high accuracy and stable readings. It consists of an ultrasonic transmitter, receiver and control circuit. The transmitter transmits short bursts which gets reflected by target and are picked up by the receiver. The time difference between transmission and reception of ultrasonic signals is calculated. Using the speed of sound and ‘Speed = Distance/Time’ equation, the distance between the source and target can be easily calculated.

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