25 Dec '15, 9pm

Touchless switches with Arduino

Touchless switches with Arduino

In the picture above you can see the system and how it operates (the real system we built had two sensors and two relays, each dedicated to a different device. The Arduino board can be seen in the middle. On its right there is the ultrasonic sensor. Relays can be seen on top of the figure. The sensors and the relays were covered by a transparent plexiglass screen with two holes corresponding to the position of the sensor (there is no need for the screen to be transparent: we chose it to be as such to let the users see what was inside). The holes were necessary to let the sound waves to be propagated toward the ceiling (the plexiglass screen reflects sound waves). Putting a hand close to the hole through which the sound waves pass, makes such waves to be reflected: the time needed to travel back and forth is recognised to be short enough and the corresponding relay is close...

Full article: http://www.element14.com/community/groups/arduino/blog/20...

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