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Friday, 04 April 2008 |
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LED Touch Panel is a input device which uses LEDs bidirectionally |
1 Overview
What many people don't know is that LEDs can not only be used for emitting but also for receiving light. This project shows how an array of 8*8 LEDs can be used as an input device. The core of the panel is an ARM7 controller which uses USB2.0 for communication with the PC. Additionally it uses the USB power and doesn't need an additional power supply. Currently the panel is equipped with IR-LEDs but it can also be used visible LEDs though my experience is that IR-LEDs are much better than visible but I didn't test them again after my last major change on my schematics. There will be new tests when I have got the next version working.
2 Properties
- 8*8 IR-LEDs
- ARM7 (AT91SAM7S64) controller
- USB2.0 (Fullspeed)
- Mostly ambient light independent
- High capture rate of >25Hz
3 Inspiration
My project is based on a video of the New York University who invented the LED Touch Panel a couple of years ago. Unfortunately on their website there is only a video demonstrating the panel and no additional information how the panel works. I tried to have a closer look in order to figure out how to reverse engineer the panel. It took quite a while but finally I figure it out. But I think my panel is more than a simple copy because it differs from the original in many ways ...
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Last Updated ( Wednesday, 14 January 2009 )
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LED Touch Panel 
