Lambdatronic_S3200/README.md

ESPHome-Froeling-Lambdatronic_3200

ESHome RS232 to TTL - ESP32 - Read data from Froeling / Lambdatronic 3200

I'm testing this with my Fröling SP Dual. But I assume it should also work for other models that have the Lambdatronic 3200 control unit. Feedback appreciated.

Parts:

Wemos D1 Mini ESP32: https://www.amazon.de/dp/product/B08BTRQNB3

MAX3232 DB9 RS232 TTL converter: https://www.amazon.de/gp/product/B0BNQ41QKQ

Wemos	TX	RX	5V	G
MAX3232	RX	TX	VCC	GND

Connect a RS232 (DB9) cable between "MAX3232 DB9 RS232 TTL converter" and you boiler's mainboard (COM2).

Boiler Settings:

• Click on the user icon
• Enter code "-7"
• Boiler > Modbus Protokoll RTU(1)
• Boiler > use Modbus Protokoll 2014

Home Assistant Dashboard

prerequisites:

• https://experiencelovelace.github.io/ha-floorplan/
• copy all files from /ha_dashboard/* to your Home assistant instance /config/www/froeling/*
• create a card in your dashboard and add the content of "ha_dashboard.yaml" !! Currently, only two panels are provided!! I'm working on the rest. An update will follow.
• The SVG files contains for image and text objects "ID's" which has to match the entity. Therefore I recommend not to change the device name of your ESP32.

ESPHome

For an better overview I split the yaml file into multiple pieces and included them in the main file as a remote package.

Just use the example from "froeling.yaml" and flash it to your ESP32.