Help with Wireless Microphone sync protocol

[alwayslearning]

Hi all,

I've tried a new scan using the much better TSOP34438 IR receiver.

I'm not sure if these scans are any better than the others.

Thanks for taking a look!

[AnalysIR]

The receiver captures are a lot more consistant & still may be serial over IR or indeed IRDA.

The pack capture is pretty bad.

However, I am thinking you could be getting interference reflections from the receiver when trying to capture the pack (if they were sendign at the same time.

Make sure to place the IR receiver close to the 2 units when capturing.

I presume you keep the units within 6 inches??

It could also be that the pack is transmitting at a different frequency. If so your LearnIr will cope with that much better once it arrives.

Another thing to try while waiting. Use the following script...to see if it is different......just load it on to your Arduino. then you can import any of the captures into AnalysIr for review & post them.
https://www.analysir.com/blog/2014/03/1 ... s-arduino/

Note: If you place the receiver sidways to both units while they are talking...your IR receiver will not know which one is talking. So I am curious How do you know which one is the Pack & which one is the receiver. I presume to get a good capture both have to be talking.

In theory you should only see both sides of the conversation & not know which one is talking.

[alwayslearning]

Hi friends --

I received the LearnIR module today and it seems to be working great!

I THINK I captured some better data.

Attached are scans from the receiver sync and also a scan from the pack(transmitter) during the sync process.

Thanks for any help!

[AnalysIR]

I will look at this capture later. In the meantime could you post a few more examples.

[alwayslearning]

And the receiver scan. I should note, these came from the LearnIR application.

[AnalysIR]

OK I had a look and yes the results are more consistnet.

However, this does not appear to be an IR remote control signal. As I mentioned earlier it is now more likely to be IRDA (SIR - Serial IR).

The following module should be able to handle this:
https://www.digikey.com/product-detail/ ... ND/4495546
(it operates at 5V or 3V3)
You can also use the serialUSB module you got with AnalysIr with this unit to connect to PC.
Thye typically use lower BAUD rates so try 1200, 2400, 4800 to start.

As IRDA is not in common use these days, the module above is the only realistic/available one I could find.

If you go ahead with that module, we are still happy to assist here.

[alwayslearning]

Thank you. I just ordered the module suggested. I'll report back soon.

[alwayslearning]

HI all,

I just received the IRDA module and could use some guidance.
Am I able to use this with LearnIR or Analysir?

Thanks for any help.

[AnalysIR]

No. Use/install a Serial terminal like coolterm and try with various baud rates.

For initial testing with coolterm, if you connect TXD to RXD on the serialUSB adapter, it essentially operates in loopback mode. So anything you type on collterm will echo back to the screen and if you diconnect TXD from RXD nothing should echo back. Try that with a few different baud rates first to get used to using it before proceeding.

Once you have completed the above, connect your new module output(Rx) directly to the TXD pin on the usbSerial adapter. (you are receiving only which is the TXD pin on the adapter). Nothing should be connected to the RXD pin on the serialUSB. Aslo connect Vcc to 5V & GND to GND.

The BAUD rates on the new module can be selected by jumpers.(see datasheet). You must match the baud rate on collterm to the baud rate selected)

[alwayslearning]

Thank you. I gave this a go this morning and unfortunately no data seems to be received.

Serial test with the USB/SERIAL adapter was good using Coolterm.

When I have a bit more time I'll try it again with some other baud rates and with some other units.

Thank you for your help.