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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

Requirements

Circuit / Wiring

Breadboard

Schematic

Wiring
(See also https://github.com/openv/openv/wiki/Bauanleitung-ESP8266)

Sensor

Debugging

  1. Attach to opto coupler
  2. 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.

  1. Attach to opto coupler
  2. 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.

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

Pictures

My setup and wiring: My setup

Links