With the modded RFM12B receiving 868 MHz signals, and the new OOK 433 Plug doing the same for the 433 MHz band, the new OOK relay is coming in sight.

Just a lousy bit of code. Elementary – I thought…

Except it wasn’t. Software always seems to take a lot more time (and concentration) than hardware. Silly!

Still, I think I managed to collect all the pieces lying around here from earlier experiments in that area, and combine them into a new ookRelay2.pde sketch.

It’s fairly elaborate and too long to show here, but I’ll pick out some pieces:

• all the decoders live in the decoders.h file
• since they all share common logic, each is derived from a common “DecodeOOK” class
• the protocol for each decoder is the same: feed puse widths to nextPulse(), and it will return true whenever a valid packet has been decoded, then call getData() to get a pointer and byte count
• the ookRelay2 sketch includes a variety of decoders, I hope we can improve/extend/add-more over time
• there are two pulse sources: the 868 MHz receiver and the 433 MHz receiver
• for each, a “DecoderInfo” table is defined with decoders to use for them
• the runPulseDecoders() function does what the name says: evaluate each of the decoders in turn
• when a decoder succeeds, data is added to an outgoing buffer (and optionally, printed to serial)
• in this example, I send the accumulated data off to the RF12 wireless network, but Ethernet or any other transport mechanism could be used as well

With this out of the way, you can probably, eh… decode the following lines at the top op the ookrelay2 sketch:

And here’s the main loop, which is keeping things going:

The hard part is doing this efficiently with accurate timings, even though a lot of stuff is happening. That’s why there are two interrupt routines, which trigger on changes in 868 MHz and 433 MHz signals, respectively:

I’m still debugging, and I need to analyze just how much leeway there is to run all the decoders in parallel. Earlier today I had the 433 MHz reception going, but right now it seems this code is only picking up 868 MHz signals:

Oh well, it’s a start. Feel free to check out the code, which lives as example in the RF12 library.

Update – Bug fixed, now 433 MHz decoding works.