Products > Test Equipment
Brymen IR connection protocol - Anyone sniffed it yet?
t1d:
Re: Lockstep Board
I have done the final sanding and the board locks into the bracket, perfectly. I only had to sand off the break-off points and remove the top coat of the solder resist, under the bracket tab areas. It was very easy, and very minor, work.
Then, I built up the PCB, using purple LEDs as substitutes for the IR components. This made for a cool looking mock-up and made it possible to check the hole locations in the board. Yes, the holes did need to be relocated, inward.
Changes:
1) Rearranged component names to make them more legible.
2) Moved the logo from the bottom surface to the top, to limit scratching of the DMM lens and reduce the thickness of the board.
3) Moved holes, inward.
4) Moved the IR component pads, for better access.
I have contacted OSH Park, regarding not placing break-off points on the curved edges. Ordering the final (I hope) design is pending their reply.
My new cell phone doesn't want to give me access to my pictures. I will try to have a friend make some and get them posted. But, no promises. Here is the lastest draft jpeg.
serggio:
You need rearrange not only component name, but entire all board should be redesigned.
You need go to double side PCB to prevent tracing connectors between components pads. Your board highly noisily with current designs.
Central pads is just contact pads or soldering pads? If it soldering, change it to connector pad.
R1, R2 pads seems oversized for standard 0805 components too
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t1d:
You make a good point about the noise, Serggio. I did give the design considerable thought and I did have to make compromises.
The traces are routed on top of the board, because the bottom of the board mates to the meter. This mating surface will be exposed to wear, which would erode any traces routed on that side. Additionally, traces on the bottom would add texture to the bottom and cause additional wear.
SMD pads were used as solder points for the through-hole components, because their pins can not penetrate the board. The through-hole components will require their pins to be trimmed and "feet" bent on the pins to rest on the pads, for soldering. I used this method to mock up the prototype, today, and it works well.
One thing that I could do to improve the trace clearances is to reduce the width of the traces. I used traces that are much wider than needed. I will heed your advice and make them more narrow, to try to avoid the noise problem, now.
Adding a ground plane might be an option, also. I will give that a look.
Only testing will indicate, if the noise level is a problem. I will only be able to do that level of testing, after I get the new version of the board.
Please feel free to propose your own design. I would be glad to have your help.
I would like to make a SMD version of the board, also. But, I am having difficulty locating the IR components in SMD. If you know of these components, please let me know.
Thank you very much for your observations.
serggio:
Make double side board with mini USB or other small one connector (molex and etc.) and join board to your meter with double side stickly (Scotch) tape. You will not need to disattaching board and scratching your meter, just attaching connector will be needed for connect it to PC.
But this is still bad, because your controller will be at separate board and you will need connect it with your board by wires.
When I worked with my prototype with same design (like your), I used ~ 50 cm wires between boards. I was not able to have good signal from my photodiode because of big capacitance in wiring and etc. It was worked, but not enough well. When I placed tr/rx diodes to main board I received double strength signal it tx line.
I do not know what SMD led may be suggest to you because I dont test it. I told you about Vishay they have wide range diodes in any cases. Check availability required components to you and do some testing.
This picture from my final board where I measured signal on Vishay TEFD 4300 photodiode in series with 68 kohm resistor.
On my prototype board with wiring connection I have twice less signal with 36 kohm and with 68-100 kohm signal was not acceptable to convert it to TTL
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npelov:
I checked the links in the first few posts and they didn't work, so I decided to post a link to all the protocols:
http://brymen.com/product-html/software-download/Protocols/
I didn't read the whole thread, so sorry if it's already posted.
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