Hi I am trying to do this project from http://arduinobasics.blogspot.gr/2012/11/arduinobasics-hc-sr04-ultrasonic-sensor.html?showComment=1399056576259#c2818655084083635801 I did everything as shown and the result is the image below. When i hover my hand in the sensor nothing happens...what am i doi…

HC-SR04 Ultrasonic Sensor Simple Project

system May 2, 2014, 7:33pm 2

What does the serial debug look like?

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