Vissmann boiler logger with DIY OptoLink interface.
AST, 12.03.2019
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"
- Use the optical maintenance interface of the Vitotronic control interface.
- 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
- 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)
(See also https://github.com/openv/openv/wiki/Bauanleitung-ESP8266)
- 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.
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
Working Arduino project. Sends collected data from OptoLink interface to MQTT server.
Example output:
/esp/VitoWiFi/ip 192.168.1.108
/esp/VitoWiFi/outsideTemp 8.9
/esp/VitoWiFi/boilerTemp 56.6
/esp/VitoWiFi/STS1 47.7
/esp/VitoWiFi/RTS 20.0
/esp/VitoWiFi/AGTS 20.0
/esp/VitoWiFi/RLTS 20.0
/esp/VitoWiFi/VLTS 20.0
/esp/VitoWiFi/setRoomTemp 309.2
/esp/VitoWiFi/setRoomReducedTemp 538.8
/esp/VitoWiFi/runHours 10274.3
/esp/VitoWiFi/starts 199237
/esp/VitoWiFi/currentOperatingMode 2
/esp/VitoWiFi/a1m1Pump true
/esp/VitoWiFi/storePump false
/esp/VitoWiFi/circuitPump false
My setup and wiring:
