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slavikb / BaiMon

ESP8266 - based Vaillant boiler E-Bus monitor, temperature/pressure publishing to Narodmon.ru
MIT License
45 stars 12 forks source link

power from eBus #1

Closed danielkucera closed 5 years ago

danielkucera commented 7 years ago

Hi,

is there any reason why don't you power ESP from eBus?

slavikb commented 7 years ago

Just for safety. I was not sure that my boiler can provide enough current and was afraid to damage it.

danielkucera commented 7 years ago

I am thinking about powering my unit from the bus. This would also mean that I don't need to use optocoupling. In theory this should be possible, eBus should provide 50-100mA@20V which means 300-600mA@3V3 according to this: http://ebus-wiki.org/lib/exe/fetch.php/ebus/spec_prot_12_v1_3_1_e.pdf

Do you think it will work?

slavikb commented 7 years ago

I am not a great specialist in electronics, so i may just guess. Looks workable, given that ESP8266 drains max 170mA during transmit. In this case you will need 3V voltage stabilizer, of course.

EUA commented 5 years ago

FYI: I tried to power my ESP8266 with EBUS 5v. I got boiler resets at ignition time. Than add step-down regulator ($1-2 USD ones sold at AliExpress, stamp size). That drop +5V bus to 3.3v, efficiently. Looks like my boiler working without issue on this setup. But if you decide to use such a step-down regulator you better to use pin 6(?) which has +24v. I can't use it since I have no 6p6c RJ11 but 4p4c one.

danielkucera commented 5 years ago

@EUA , thanks for hints. I'm running it with a stepdown regulator for about a year now a had no troubles so far. Not sure what connector are you talking about but my eBus provides about 20V when idle.

LordMike commented 4 years ago

@EUA do you have a wiring schematic for powering a 3V3 ESP8266 from the eBUS line?

slavikb commented 4 years ago

Unfortunately, not. AFAIK, danielkucera had developed such device.

LordMike commented 4 years ago

Tagging @danielkucera to hear if he has a schematic. :)

danielkucera commented 4 years ago

@LordMike This is what I use: https://github.com/danielkucera/ebus-adapter

It works but the DC/DC regulator is squeaking and I didn't find out why so far. Maybe it would be worth try to replace the regulator module with a different chip.

LordMike commented 4 years ago

Could I trouble you to add a few lines to the repo, which file is what etc.. ?

I'm not familiar with a few of the filetypes, and it seems like there's a mix of a v1 and v2 ?

danielkucera commented 4 years ago

It's still quite raw repo. Just use KiCAD and open wiring.pro

EUA commented 4 years ago

@LordMike , nope. I don't have schematics. Just make it on breadboard.