RC5 IR remote decoder using 12 LEDs

Bill Bowden · 2012-11-05T05:39:51+00:00

I'm attempting to construct an IR receiver circuit capable of receiving and displaying IR signals in binary format (using LEDs) from hand held IR remote controls. The protocol I'm interested in is the RC5 format originally developed by Phillips. The format consists of 2 start bits followed by a toggle bit indicating a new key is pressed, followed by 5 address bits, and then 6 command bits for a total of 14 bits. I plan to display the bits using 12 LEDs. The RC5 code uses a system where each bit is one cycle of equal time where a "1" is represented by the first half cycle being low followed by the second half cycle high and visa versa for a "0". This yields a weird waveform where the end of one bit may be the same level as the beginning of the next. What would be the best approach to decode the data using a couple shift registers and some sort of clock to sample the data at the right time? Thanks, -Bill

Nov 05, 2012 21 Replies

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John Fields 13 years ago

Larkin? What is this "Larkin" to which you refer? What it's all about is that Bill Bowden and I have been having a civilized discussion about a remote control decoder, he asked about how the start bit got everything going and I thought, after having posted the explanation, that I'd made a mistake. When I see something that looks like I've made an error I like to post about it immediately in case anyone has plans for realizing the circuit in hardware, and if I find later that I was wrong about being wrong, (as in this case) then no harm done when I post a retraction.

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Jim Thompson 13 years ago

It's a virus that's been infected by a trojan ;-)

...Jim Thompson

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