Decoding infrared protocol

Projects Networking, Protocols, and Devices
1

Hi,

I try to decode an infrared remote of my radiocar but without success :frowning: .

I need it for my steering wheel remote project with an arduino nano.

It's look like a NEC Infrared Transmission Protocol .

Power + Mute :

Vol + :

Vol- :

You can see in attachments :

  • The capture signal get with the saleae program

saleae_files.zip (14.7 KB)

2

I find my problem.
My ir recever look not compatible.
I put my logic analyser directly in my ir remote led.

But i have some question.

The pulses led width are 41.67ns and the periode is random.
It's not 38KHz like i expect.

I use a 24MHz logic analyser.

power+mute2.zip (18.6 KB)

3

You are correct it does look like an NEC signal, based on the images. The last bit is the repeat part.

It also looks like your IR reveiver may be an issue.....what is the model # (link) for the IR receiver.

You should not be getting anywhere near nSecs with a standard IR receiver.

....OH I just noticed that you are using an IR LED. The output will not be 100% digital which is what the LA is expecting.
That may explain some of your issues.

You could try the following, using an IR LED:
Poor maker’s Infrared receiver
..if you don't have access to an IR Receiver.

4

Alternatively, you could try to slow down the sample rate of your LA, if possible.