PIC to control NEXA remoteswitch

[Bruce]

Hi Fredrick,

Excellent. I'm glad you got it working, and happy to help.

We lucked-out having someone else do the dirty work for us...;o}

Dave & Anand both make good points above. If you have access to an O-Scope or can
build the sound card version, it makes the whole process a lot easier. And then you'll be
relatively sure your timing is correct.

I suspect this is what someone did when they wrote NexaProtocol.txt. You can probably
tweak the timing down to near perfect if you scope the data output pin on the NEXA
encoder IC in your transmitter.

At least now you have something to work with, and you can see how the timing from
NexaProtocol.txt was converted to a few simple PBP routines.

Cloning most encoders is relatively simple. The decoding part is a LOT more work.

Maybe you could post what you have now in the code examples section to share with
others?

[Fredrick]

I tryed to do the sound card version today byt no one of my 2 computers have a "Line in" or "Audio in" input, only a input with a microphone symbol on and that does´t work.

I have now posted the code in the code exampel area now.

[Fredrick]

Is it posible to capture the RF signal with the PICkit2 tool "PICkit 2 Programmer Logic Tool Analyzer"?

If so i will buy the PICkit2 programmer (i need a new programmer with USB support.)

http://www.microchip.com/stellent/id...cName=en023805

[ardhuru]

I tryed to do the sound card version today byt no one of my 2 computers have a "Line in" or "Audio in" input, only a input with a microphone symbol on and that does´t work.

You still might be able to use the mic input, if you attenuate the signal 1:1000 (a 100K and a 100ohm resistor divider, perhaps?). The waveform might not look picture perfect, but will surely be good enough for your purpose.

Alternately, if you have a serial port, you might want to look at Dante's infrax utility at http://www.geocities.com/tdanro/irman/irman.html

This would require you to build a small capture circuit, and be informed this does not work reliably with USB-to-serial interfaces. On a native serial port (or a PCI based additional one) it works quite brilliantly.

Regards,

Anand

[Fredrick]

Ok, i will try.

But i still need a new programmer so i hope that i can use the "Logic Tool" in Pickit2, or does´t that work?

[dhouston]

The mic input is tricky. Usually, it has +5V on one conductor to power electret microphones. Some are stereo.

• http://www.hobby-hour.com/electronic...microphone.php

A logic analyzer might work but I've never tried one. The signals typically are between 1000Hz & 2000Hz.