Products > Test Equipment
Brymen IR connection protocol - Anyone sniffed it yet?
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jadew:
@jesuscf

Nice job! your adapters look much better than mine.

Here's what I did:
t1d:
Yes, I am aware that this is an old thread.

This is a pdf drawing of a prototype Eagle board that I intend to post to this thread. It is intended to use the design, posted earlier, with its specification of through-hole IR LED components and the needed Resistors, mounted vertically, on SMD pads. I still need to print out a scaled drawing and verify that all of the dimensions are correct. I will not be providing a schematic, because it is available in early postings and having a schematic tied to the board limits the tricks that I used to configure the board.

I suggest using OSH Park for production of the board. They will do all of the critical cutting, for the board profile, and their solder resist coatings are superior to the Chinese houses. I think that the stronger coating will last longer on the connector’s twist-lock surfaces. I may post the Eagle files, there, also.

I did not include a ground plane. This will aid in tweaking the board thickness, to mate with the lock bracket. I suggest having the board made in the thickest, no-up-charge plastic. If it is too thick for the lock bracket, it can be easily sanded. If it is too thin, the plastic can be built up with super glue and baking soda; this makes an excellent faux plastic. Just apply SG to the board and sprinkle on the BS. Repeat and sand, as necessary.

Things that would be helpful:
-   If you would like an alternate board, having a lower profile, I need the make, model number and distributor for SMD style IR LED and Resistor components. 0805 size resistors should be “solderable,” by hand. The IR LED components will need to have solder pads on the top corners of their bases, to facilitate inverting them on the PCB. I don’t play with LEDs much, so maybe you know about these components better than I do…
-   Verification of the IR LED Resistor value… 150 Ohm, down from 330 Ohm?
-   My controller will be a PIC18F4550, as I have already developed it for other projects. I recall that someone was using an 18f series PIC. I would very much like that c code, if it was developed.
-   If anyone developed a computer-side program in Java, I would love to have that, also…
-   Any suggestions you have.

I look forward to working on this project with you.
jadew:
Ok, a couple of notes:

1) If you used the schematic from post #41, you got the TX path wrong, but it should work like that too, only that you would use the MCU as a sink instead of a source.
2) The LEDs are IR, not UV. Odds are it won't work with UV LEDs, since it's made to block visible light and UV is on the other side of the spectrum.
3) You should probably make a piece of plastic that fits in there first, measure it and then try to get a PCB of that thickness.

About the resistors, I went by trial and error, I guess it depends on the voltage you'll use and on the LEDs themselves. The reason one resistor is 330 Ohms and another one is 150 is because I needed more current in the TX one, but "less" pulldown for RX (so higher resistance).

For the record, I'm happy with my ghetto adapter.

Cheers
t1d:

--- Quote from: jadew on May 12, 2016, 03:59:31 am ---1) If you used the schematic from post #41, you got the TX path wrong, but it should work like that too, only that you would use the MCU as a sink instead of a source.
--- End quote ---
Good catch! I will correct it.

--- Quote from: jadew on May 12, 2016, 03:59:31 am ---2) The LEDs are IR, not UV. Odds are it won't work with UV LEDs, since it's made to block visible light and UV is on the other side of the spectrum.
--- End quote ---
Doh! Yes, IR not UV. I have edited my prior post.

--- Quote from: jadew on May 12, 2016, 03:59:31 am ---3) You should probably make a piece of plastic that fits in there first, measure it and then try to get a PCB of that thickness.
--- End quote ---
I have a small piece of OSH Park board. I will use it to check the thickness. Great suggestion.

--- Quote from: jadew on May 12, 2016, 03:59:31 am ---About the resistors, I went by trial and error, I guess it depends on the voltage you'll use and on the LEDs themselves. The reason one resistor is 330 Ohms and another one is 150 is because I needed more current in the TX one, but "less" pulldown for RX (so higher resistance).
--- End quote ---
Well, I don't have to specify their values on the board, so folks can use whatever they need.

The price for OSH Park boards, of the current profile, is less than $5/shipped/QTY(3). That's cheap enough...

Thank you so much for your help! You made lots of really good points.
Jacek_Paw:
If you already know that Brymen uses rs232 why don't you just use some RS232 sniffing computer software like Free Serial Port Monitor (HHD Software)?
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