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http://www.micropik.com/PDF/HCSR04.pdf<br /> | http://www.micropik.com/PDF/HCSR04.pdf<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 /> | ||
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http://howtomechatronics.com/tutorials/arduino/ultrasonic-sensor-hc-sr04/<br /> | |||
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