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Topic: IRDA (Infrared data transmission) (Read 1 time) previous topic - next topic

westfw

Has anyone modified ant of the softwareSerial libraries to support IRDA transmission (at the low levels)?
My understanding is that this would consist of changing the "on" time for transmitted 1 bits to 3/16 of a bit time instead of a full bit time, which ought to be relatively trivial.  But it would certainly be nice to have a known-working implementation!
(Reception would be harder, I guess.)

(Note that unlike other IR communications protocols, IRDA does NOT modulate a "carrier frequency."  A transmission has a an LED "on" for a one bit, and off for a zero bit (or perhaps the other way around), rather than bursts of ~40kHz modulated signals.  So most of the existing infrared libraries are not useful.)

pito

Do you need to adhere to full IRDA spec, or, do you just need a simple IR avr<->avr communication?

westfw

I want to talk to Disney hats, which apparently use IRDA SIR at 2400bps at the bottom levels...

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