Comments (12)
bbqkees
commented on May 27, 2024
1
Ok no problem. It's a common mistake.
I'll close the issue now.
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bbqkees
commented on May 27, 2024
Try swapping TX and RX.
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kkberg
commented on May 27, 2024
doesn't work either, also swapping jumper doesn't change anything
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bbqkees
commented on May 27, 2024
Can you tell me exactly which pins on the board you connected to which pin on the Wemos?
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kkberg
commented on May 27, 2024
first I tried like written in your manual Rx to Rx, Tx to Tx. 3,3v to 3,3v and GND to GND.
Now I swapped Rx to Tx on ESP and Tx to Rx as usual. Tried also a NodeMCU LOLIN doen't work
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bbqkees
commented on May 27, 2024
Did you connect RX to D7 and TX to D8?
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kkberg
commented on May 27, 2024
I'm so sorry, that's the reason. I now see 👍
EMS Bus Connected with Rx active but Tx has been disabled (in listen only mode). Problem as always 50cm infront of the screen. Now I'm really excited to see data. I'll give you a message later.
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kkberg
commented on May 27, 2024
| {"selFlowTemp":5,"selBurnPow":0,"curBurnPow":0,"pumpMod":0,"outdoorTemp":3.5,"wWCurTmp":51.9,"wWCurFlow":0,"curFlowTemp":27.2,"burnGas":"off","flameCurr":0,"heatPmp":"off","fanWork":"off","ignWork":"off","wWCirc":"off","wWHeat":"off","wWStarts":981,"wWWorkM":17319,"burnStarts":1989,"burnWorkMin":35777,"heatWorkMin":18458,"ServiceCode":"0H","ServiceCodeNumber":203} | |
|---|---|
| 2019-11-11 09:40:48 | tapwater_active |
| 2019-11-11 09:40:48 | heating_active |
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kkberg
commented on May 27, 2024
Thank you again, you made my day. Sorry for making trouble. You are now also mentioned with a link on Alex Kabza's webside. I'm also talking to him because of another interface! http://www.kabza.de/MyHome/EMSbus.html
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bbqkees
commented on May 27, 2024
The reason D7 and D8 are used on the Wemos instead of the normal TX and RX is because at boot the ESP sends out some debug information on TX, thereby disturbing the EMS bus.
With the pinswap function the UART is set to the alternative pins D7 and D8 after this debug stuff is sent so the EMS bus is never disturbed.
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kkberg
commented on May 27, 2024
Okay, I red it but didn't take care when connecting the ESP. Now I get data but what happenes is, that my RC310 goes on failure and is only shwoing a blinking screen. Any ideas?
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kkberg
commented on May 27, 2024
After letting it work for some time, connection to EMS-Bus ist lost and one capacitor is getting very hot.
It's C1 on the pcb. What could happened to cause this?
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