Hacks and Mods: Arduino Based Capacitive Touch Screen


Arduino based projects
are quite complicated and is no cake walk for beginners in this field.
Interfacing a tablet with the microcontroller is a daunting task. Let
see how its done here.

The primary focus should be on using the appropriate drivers for the tablet. This makes it a USB
host. As seen in the video, light can be a medium of communication
between the tablet and the microcontroller. A photo diode or
photoresistor is what is needed here and this should be pressed against
the screen.

http://youtu.be/JDgDMBquBw0

Building a touch sensing capability can help in providing
communication between the microcontroller and the tablet. Capacitive
touch screens function by sensing the capacitance changes on the screen.
In this case, a large conductive brass plate is used to simulate touch.
The surface area of the conductor used here to simulate the touch
should be large.

Testing can be done by touching the screen with a wire and holding
the other end. This may not work. This is made to work by sticking a
piece of aluminum foil on to the screen and connecting the free end to
the pin that is available on the arduino. The video shows the working of
the capacitive touch screen. The setup is quite fragile and a little
more circuitry could improve its reliability. Thus the capacitive touch
screen is done.

http://blog.theultimatelabs.com/2012/05/triggering-capacitive-touch-screen-with.html


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