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'''Ultrasonic Sensor'''<br /> | '''Using a Ultrasonic Sensor'''<br /> | ||
http://www.elecfreaks.com/store/download/product/Sensor/HC-SR04/HC-SR04_Ultrasonic_Module_User_Guide.pdf<br /> | http://www.elecfreaks.com/store/download/product/Sensor/HC-SR04/HC-SR04_Ultrasonic_Module_User_Guide.pdf<br /> | ||
http://randomnerdtutorials.com/complete-guide-for-ultrasonic-sensor-hc-sr04/ | http://randomnerdtutorials.com/complete-guide-for-ultrasonic-sensor-hc-sr04/ | ||