Hi,
I'm a step further in my project, please briefly watch the video to see what it is about:
http://www.youtube.com/watch?v=z4eTjH4zjwE
The circuit is a 555 astable that controls an analog switch. It switches a connection running from the screen (under the foamboard) to the iphone's dock connector. The latter may very well be replaced with a connection to the metal sides of the phone or the headphone jack, or if you press the wire hard enough, your hand will do fine. The application on the phone simply registers touches and colors the screen green when the switch is closed.
The ultimate goal here is to get rid of this required 'ground' connection, so that I can freely place these little circuits on the surface of an iphone or ipad. Theoretically it should be possible, by holding the wire while balancing myself on top of the circuit...
Do you have any suggestions on what I could try, or does it simply not comply with the laws of nature. I'm looking for something small that replaces body capacitance. I'v found somewhere that the human body can be represented by a 20pF cap in series with an 1.5KΩ resistor, but I wouldn't know how to wire that in this case...
I'm a step further in my project, please briefly watch the video to see what it is about:
http://www.youtube.com/watch?v=z4eTjH4zjwE
The circuit is a 555 astable that controls an analog switch. It switches a connection running from the screen (under the foamboard) to the iphone's dock connector. The latter may very well be replaced with a connection to the metal sides of the phone or the headphone jack, or if you press the wire hard enough, your hand will do fine. The application on the phone simply registers touches and colors the screen green when the switch is closed.
The ultimate goal here is to get rid of this required 'ground' connection, so that I can freely place these little circuits on the surface of an iphone or ipad. Theoretically it should be possible, by holding the wire while balancing myself on top of the circuit...
Do you have any suggestions on what I could try, or does it simply not comply with the laws of nature. I'm looking for something small that replaces body capacitance. I'v found somewhere that the human body can be represented by a 20pF cap in series with an 1.5KΩ resistor, but I wouldn't know how to wire that in this case...