AVR-Chat

--- In AVR-Chat@yahoogroups.com, "fjch100" <fjch100@c...> wrote:
>
> --- In AVR-Chat@yahoogroups.com, erikc <firewevr@a...> wrote:
> >
> > fjch100 wrote:
> > > HI, I just upload a new pdf file with information about using 
> normal 
> > > LEDs like sensor to interchange information between modules.
> > > I just found it surfing the web, but I feel the need to share 
> with all 
> > > the AVR comunity. I may be some one can write a driver in GCC 
to 
> just 
> > > include and use in all the AVR projects....
> > 
> > Wanna tell us the file name?
> > 
> > erikc
> >
> 
> the program name is:
> 
> Comm_using_Bidirecctional_LEDs.pdf
>
This is the abstrac of the file:

A novel microprocessor interface circuit is described which 
can alternately emit and detect light using only an LED, 
two digital I/O pins and a single current limiting resistor.

This technique is first applied to create a smart illumination 
system that uses a single LED as both light source and sensor. 
We then present several devices that use an LED as a generic 
wireless serial data port. 

An important implication of this work is that every LED connected
to a microprocessor can be thought of as a wireless two-way 
communication port. 

We present this technology as a solution to the "last centimeter
problem", because it permits disparate devices to communicate with 
each other simply and cheaply with minimal design modification.