MyVitotronicLogger

Vissmann boiler logger with DIY OptoLink interface.

AST, 12.03.2019

Motivation

For a Vissmann boiler with a control interface Vitotronic 200 KW1 (V200KW1):

How much energy is consumed?
How to monitor the boiler's temperatures?
What is the boiler doing over time?
How to interface with the boiler?

(DE) "Witterungsgeführte Kesselregelung für gleitend abgesenkte Kesselwassertemperatur"

Solution Approach

Use the optical maintenance interface of the Vitotronic control interface.
- https://github.com/openv/openv/wiki/Die-Optolink-Schnittstelle
- KW Protocol, https://github.com/openv/openv/wiki/Protokoll-KW
Use Arduino ESP8266 with a DIY optocoupler interface, see https://github.com/openv/openv/wiki/Bauanleitung-ESP8266
Use VitoWiFi library
- Arduino Library for ESP8266 to communicate with Viessmann boilers using a (DIY) serial optolink.
- https://github.com/bertmelis/VitoWiFi.git
- Many thanks for this gread library!
- Based on the fantastic OpenV library

Requirements

ESP8266, e.g., Wemos D1 Mini
OptoLink interface: https://github.com/openv/openv/wiki/Bauanleitung-ESP8266
Libraries for:
- Arduino, e.g., Arduino IDE
- ESP8266 / Wemos D1 Mini
- VitoWiFi, https://github.com/bertmelis/VitoWiFi
  - Tested working version was Version 1.0.2 from 10.11.2018
Optional: RS232 USB cable for Serial1 observation (attach to D4)

Circuit / Wiring

Debugging

Attach to opto coupler
Attach RS232 USB cable to D4 to listen for Serial1 messages. Serial1/UART1 TX pin is D4.

Do not connect to RX/TX because those are reserved for opto-coupler communication!

For debugging the Serial1 Arduino software UART is being used.

Serial1.begin(115200);

All logging and status messages are being print using Serial1.print.
Serial1 uses UART1 which is a transmit-only UART.

Development

vitowifitests

Testing project to test the OptoLink interface.

Attach to opto coupler
Attach RS232 USB cable to D4 to listen for Serial1 messages. Serial1/UART1 TX pin is D4.

Example output:

temperature - boilerTemp is 32.4
temperature - STS1 is 48.5
temperature - RTS is 20.0
temperature - AGTS is 20.0
temperature - RLTS is 20.0
temperature - VLTS is 20.0
temperature - setRoomTemp is 309.2
temperature - setRoomReducedTemp is 513.2
burner - runHours is 10272.3
burner - starts is 199182
operation - currentOperatingMode is 2
pump - a1m1Pump is true
pump - storePump is false
pump - circuitPump is false

vitowifimqtt

Working Arduino project. Sends collected data from OptoLink interface to MQTT server.