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Talking to Ultrasonic Distance Sensor HC-SR04 using nRF51822

Mahesh Venkitachalam

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Communicating with Ultrasonic Distance Sensor HC-SR04 using nRF51-DK (nRF51822/nRF51422), and transmitting measured distance over BLE UART.

http://electronut.in/nrf51-hcsr04/