Complete and easy understanding of HC-SR04 Ultrasonic Range Sensor working and it’s programming interface with Raspberry Pi using python

Please go through the below link to get the complete understanding of HC-SR04 module

https://www.modmypi.com/blog/hc-sr04-ultrasonic-range-sensor-on-the-raspberry-pi

Link for raspberry pi HC-SR04 library module

https://pypi.python.org/pypi/hcsr04sensor/1.2.0

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