Products > Test Equipment
Brymen IR connection protocol - Anyone sniffed it yet?
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t1d:
The new "Lockstep" Digital MultiMeter interface pcb boards arrived, today. The fit into the bracket on the DMM remains good and is consistent. Break-off tabs were placed on the curved locking surfaces, again. You may recall that OSH Park could not offer a good solution for that.

The corrected hole positions for the infrared components seems to have improved alignment with the DMM's infrared components; the alignment appears to be perfect. This allows proceeding to the next step, soldering up a working prototype. That's exciting...

I have thought of a method to prevent the potting material from seeping under the IR components. The convex lens of the IR components will be seated in Viton o-rings and mated to the PCB board. The hole in the o-ring will facilitate light communications. Green, Viton o-rings are heat and chemical resistant, which aids the use of various potting agents.
t1d:
I have discovered a couple of more things, this afternoon...
- I have learned how to prevent the solder mask from being printed on the curved tabs that mate to the bracket. This means that this paint will no longer need to be removed by sanding, etc... See jpeg
- I am having difficulty finding an o-ring that will work to seal under the IR component lenses. The problem is that the o-rings are too thick... The thickness covers the IR component pads... I will have to devise another method.
t1d:
Hmm... Seems my last reply did not post?

I finished assembling a Lockstep prototype board. This is a fully functional prototype, not just a mock up model. I am well satisfied with the soldering. I will not pot the components, in case the resistors need to be changed to different values.

I want to test the Lockstep, so I will build a go-no-go circuit on a breadboard. I want to power it with 5 volts, as this is what the PIC18F4550 uses. The phototransistor will drive a common LED as an indicator light. The circuit only has a few parts... A power source, a LED and its resistor, and the Lockstep, of course... That's it...

I have ordered the most recent revision of the Lockstep board, mostly just for fun, but I also want to see how the "paint" stop works for the curved locking surfaces. The boards that I have on hand are perfectly usable for prototyping.

@ Jadew - Did you use the QED123 and the QSD124? If not, please tell us what you did use. I reread the whole thread, but I didn't see this information. And, for whatever you are using, please tell us about how you are supplying the needed voltage and amps. Thanks, yet again!
JackM:
Nice progress t1d! I would be interested in getting one of these boards for my own Brymen BM867s if you do find that they work as intended.
jadew:

--- Quote from: t1d on June 15, 2016, 01:38:53 am ---@ Jadew - Did you use the QED123 and the QSD124? If not, please tell us what you did use. I reread the whole thread, but I didn't see this information. And, for whatever you are using, please tell us about how you are supplying the needed voltage and amps. Thanks, yet again!

--- End quote ---

Just some generic IR diodes I found in my parts bin. I think I bought them a long time ago from dx.com or buyincoins.
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