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Victor-Mo / IRT-ESP

Nefit / Buderus iRT protocol encoder / decoder for ESP8266
GNU Lesser General Public License v3.0
22 stars 6 forks source link

Modification for v3.0 interface board #19

Closed n1kDon closed 1 year ago

n1kDon commented 1 year ago

Is there a guide how to modify the V3.0 interface board from BBQKees?

Victor-Mo commented 1 year ago

@n1kDon I have not look at the new interface board. The modified EMS boards do not always work. But the circuit suggested in #14 seems to work reliable you may want to have a look at that.

n1kDon commented 1 year ago

Thx!

harrymayr commented 1 year ago

@n1kDon The 100k you need to remove (R5 on the old gateway) is R22 and the additional 1M5 resistor, need to be soldered between pin 2 & 8 of U2, or between the points marked in the attached grafik.

Best regards,

Harry V3-Modifikation

vestaxbham commented 1 year ago

Could somebody tell me what exact resistor is needed? 1M5 I understand. But there're different kinds of nominal load of each resistor, e.g. 0,25W.

Maybe somebody could past a link to the resistor that is needed? Or is it irrelevat what kind of nominal load a resistor has?

Thanks!

mattes34 commented 1 year ago

Doesn’t matter. Use what you find. But i also can say that my case I had to changed some more resistor values to get it working. I will search my measurements and results.

vestaxbham commented 1 year ago

Good to know, thanks!

It would be great if you could share some more of your experience. 👍

n1kDon commented 1 year ago

I soldered a 1,5M resistor between pin 2 & 8 of U2 but had no luck so far. No connection.

vestaxbham commented 1 year ago

I soldered a 1,5M resistor between pin 2 & 8 of U2 but had no luck so far. No connection.

Did you also remove the R22?

n1kDon commented 1 year ago

Yes I did so. I damaged the pad of R22 after soldering the resistor to vcc. Therefore I soldered the resistor directly to pin 2 & 8

harrymayr commented 1 year ago

@n1kDon then step by step:

n1kDon commented 1 year ago

@harrymayr

  1. I tryed it with both modes, with the thermostat connected and after that only with the gateway connected
  2. I dont think so but I will double check
  3. no I dont see any crc errors only the message that it is not connected when I log j
  4. I connected the gateway on pin 3 and 4 like the thermostat (which I temporary disconnected) on the uba 4001 boiler

I will try to change the resistor tomorrow

vestaxbham commented 1 year ago

I soldered a 1,5M resistor between pin 2 & 8 of U2 but had no luck so far. No connection.

Could you please take a picture of your work and post it here?

Cross my fingers that you figure out why it isn’t working as espected. :)

mattes34 commented 1 year ago

Hi. I checked my board and I also changed the R3 from 360Ohm to 1800Ohm. Here I uploaded a ltspice simulation which used next to the osiloscope to get it working. https://github.com/mattes34/WEMOS-IRT

n1kDon commented 1 year ago

Hi, I tested it with 2M resistor but had no luck either. Only no iRT bus signal error. Here ist a picture with a 1M and 470k resistor in series. I am no expert, perhaps I did some stupid mistake.
unnamed

vestaxbham commented 1 year ago

Hi. I checked my board and I also changed the R3 from 360Ohm to 1800Ohm. Here I uploaded a ltspice simulation which used next to the osiloscope to get it working. https://github.com/mattes34/WEMOS-IRT

So, you removed the R22 and added the 1,5M resistor. Additionally you changed the R3 from 360Ohm to 1800Ohm. Do I understand correctly?

Is this needed because of the V3 PCB? It is not documented, isn‘t it? Or do I missed something?

Thanks!

mattes34 commented 1 year ago

I refer to the numbering of this schematic https://github.com/Victor-Mo/IRT-ESP/blob/master/doc/schematics/IRT-V09_schema.png

This was needed in my enviroment. Using this circuit to read the IRT bus is, let's say, more like a workaround. See https://github.com/Victor-Mo/IRT-ESP/issues/14

So in my enviroment I get it running by increasing to 1k8 to get a higher amplitude for the LM393.

vestaxbham commented 1 year ago

Hi, I tested it with 2M resistor but had no luck either. Only no iRT bus signal error. Here ist a picture with a 1M and 470k resistor in series. I am no expert, perhaps I did some stupid mistake. unnamed

Thanks for the picture! Looks good in my opinion. Did you already change the R3, as mattes34 mentioned before? Idk but may be this could do the trick?! Otherwise it could be that you damaged the PCB at R22 pad… But I‘m not an expert, too…

vestaxbham commented 1 year ago

I refer to the numbering of this schematic https://github.com/Victor-Mo/IRT-ESP/blob/master/doc/schematics/IRT-V09_schema.png

  • Remove of the 100k R5
  • add 1M5 from LM393 minus to 5V
  • Change of R3 from 360 to 1k8

This was needed in my enviroment. Using this circuit to read the IRT bus is, let's say, more like a workaround. See #14

So in my enviroment I get it running by increasing to 1k8 to get a higher amplitude for the LM393.

Thanks for the details. For the V3 PCB it is R22, right? as soon my Gateway arrives, I‘ll give it a try. :)

harrymayr commented 1 year ago
  • Change of R3 from 360 to 1k8

Please have in mind, that R3 (360R) is on the v3 Gateway R5 (near to D6).

n1kDon commented 1 year ago

I managed to get it working as described above without changing R3, used another esp-mini, thx all!