frankwas Posted September 15, 2006 Report Share Posted September 15, 2006 Hi All.I am really intereste in building a touch sensitive controller for my room. But, I want to make it look awesome. I was wondering if it is possible to make a circuit that can pick up touch through glass or plexiglass or similar? Does anyone know where I could look for a circuit or anyone point me in the right direction. I looked for a few circuits, but they all require the person to physically touch an open metal contact.Regards,F. Quote Link to comment Share on other sites More sharing options...
jgeidl Posted September 15, 2006 Report Share Posted September 15, 2006 You might think about a light curtain instead...like a garage door opener but a lot smaller. Instead of the touch to the surface the trigger is tripped by passing your finger through the light curtain. With this approach you could trigger the switch by passing anything through the light curtain, not just a finger.Jim Quote Link to comment Share on other sites More sharing options...
Guest Tkjas Posted September 15, 2006 Report Share Posted September 15, 2006 Light Curtain's a good idea.There is a very complicated way to amke something like u said. You could also build a short range radar/ or Ultasonic tracker that would send out waves to a range of 1cm-5cm? depending on what's between it. When something is near, the switch would be turned onAnother one, I haven't seen it for more than 10 years!!! I think it's that if u touch a pin on a MOSFET?, the circuit would turn on the switch. This doesn't need something to complete an open contact, but just the capacitance of ur body. ;D-Tkjas Quote Link to comment Share on other sites More sharing options...
frankwas Posted September 15, 2006 Author Report Share Posted September 15, 2006 Oh ok. Thanks for the quick replies. I think the mosfet idea will work well. The light curtain will also work. I think I first need to look around for a bit and see what I can find. Thanks for your input guys! Quote Link to comment Share on other sites More sharing options...
Theatronics Posted September 16, 2006 Report Share Posted September 16, 2006 Check out a product called Q-Proxhttp://www.qprox.com/products/touch.phpSensors can pick up finger touches through thick plexy.Edge light your plexy and etch symbols into it for a amazingdisplay/ control panel!-Mike Quote Link to comment Share on other sites More sharing options...
Guest Tkjas Posted September 16, 2006 Report Share Posted September 16, 2006 Nice find, and solution to the problem!!!The only thing I don't see are the price for the components. Know what they are?I haven't found any good circuits from my papers, or the internet.Here's a project that when u touch the base pin of a PN2907 (PNP) transitor, the switch would be turned on. http://www.discovercircuits.com/PDF-FILES/5vmom1.pdf#search=%22touch%22 Quote Link to comment Share on other sites More sharing options...
Guest Tkjas Posted September 16, 2006 Report Share Posted September 16, 2006 Here's a whole stack of Touch activated switch circuits!!! ;Dhttp://www.discovercircuits.com/DJ-Circuits/touch-sw-circuits.htm Quote Link to comment Share on other sites More sharing options...
Theatronics Posted September 16, 2006 Report Share Posted September 16, 2006 Tkjaz, Looks to be about $3.00 us.Digikey Link:http://dkc3.digikey.com/PDF/T063/1898.pdfMight be able to find them cheaper from other sources.-Mike Quote Link to comment Share on other sites More sharing options...
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