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Brymen IR connection protocol - Anyone sniffed it yet?

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t1d:

--- Quote from: serggio on May 28, 2016, 08:24:35 am ---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.
--- End quote ---
This is a good suggestion, but it is not the type of functionality that I, personally, desire. I want to be able to remove the silicone cover to access batteries, fuses, etc.

--- Quote from: serggio on May 28, 2016, 08:24:35 am ---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.
--- End quote ---
You may recall that the others that designed the system are using controllers separated from the IR board by wire. I am using this type of system, also, so a wire is necessary. They were able to get it to work. I am hopeful that I will be able to, also. Some folks lowered the resistor values to increase the output.

--- Quote from: serggio on May 28, 2016, 08:24:35 am ---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.
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I did research the SMDs that you suggested. The best that I could tell, the SMD IRs have a higher amperage draw that  could not be readily fulfilled by the USB power supply. I may have that all wrong, as I do not know much about these components.

--- Quote from: serggio on May 28, 2016, 08:24:35 am ---
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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Yes, that is a cool picture. You have very nice measurement equipment.

serggio:

--- Quote from: t1d on May 28, 2016, 05:50:29 pm ---I did research the SMDs that you suggested. The best that I could tell, the SMD IRs have a higher amperage draw that  could not be readily fulfilled by the USB power supply. I may have that all wrong, as I do not know much about these components.

--- End quote ---
Hi t1d.
Could you explain please, what you mean above? To receive signal from photodiode you should connect in reverse to your chain. That is mean cathode to positive rail, anode to resistor, resistor to ground rail. Absolute max reverse voltage for photodiodes usually 30-60 V. USB is 5 V only. You can use any photodiode in USB powered device.
Could you post your schematic pls?   

t1d:
Hi, Serggio,

Not voltage, rather, amperage. The controller can only supply 20mA, per pin, if I remember correctly. The SMD IRs seemed to require more than that, if I read the specs correctly.

I did not develop the schematic. I used the IR portion of the circuit specified at post #41/Pg 2.

t1d:
Here is the updated board, per Serggio's suggestions.

serggio:

--- Quote from: t1d on May 28, 2016, 06:52:51 pm ---Not voltage, rather, amperage. The controller can only supply 20mA, per pin, if I remember correctly. The SMD IRs seemed to require more than that, if I read the specs correctly.

--- End quote ---
:o
You telling about emitting LED. But you need use it in series with resistor! Resistor for limiting current consuming by LED. If your LED have 1,2 V forward voltage for 10 mA, then you need connect resistor in series 5-1,2 = 3,8 V. R=U/I = 3,8/0,01 = 380 Ohm.  :-//

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