to chat ;)
This has enabled the possibility to program a "powerlimit" on my heat pump. Since I have 15 heating zone's in my house, I always had the program of the heating pump running at max power when a zone with relative cold water opened. Now I monitor this and lower the flow temperature to prevent this. It also increases the flow temperature when possible to the requested max temperature. If I want I could even heat my house based on power input instead of water temperature input.
I have a similar to translate to and from MQTT, and have patched it into Home Assistant
As I don;t have Melcloud, I was looking at this pic..
From the MElcloud site
Just trying to work out which features are left to find
From what I can see, it is possible to Set Zone 1&2, Room Temp, Flow Temp, but not adjust the compensation temp... We have found that too..
You can adjust the DHW setpoint and turn on 'Boost' ... We can do that too
On Melcloud, it looks like you can setup 'Holiday MOde'
I was hoping we'd be able to set the heating and hot water between Off/Timer/On, like on the FTC5, but I can's see that
Have I missed anything major?
That one you mean?
Nice, I will try it this week ;)
Hi all, I saw your thread on tweakers.net and am very interested in getting this running @ my home as well (Mitsubishi Ecodan owner). Currently I'm running a WeMos D1 to force a 10 minute duty cycle on the thermostat input, so adding this to get readings from the heatpump in my OpenHab installation would be very nice :-)
@BartGijsbers any suggestions on where to get the level shifter? I have a lot of stuff lying around except for that. I would like to play around with your code to implement the homie standard (https://homieiot.github.io) so compatible controllers like OpenHab can automatically recognize it.
Welcome to the team Rob! I am using this level shifter: https://www.aliexpress.com/item/32772428392.html?spm=a2g0s.9042311.0.0.27424c4d3Cpscp. I think am level shifter will do to be honest. I am also controlling the thermostat input with a D1 mini already for years. I build my own thermostat/zone control. I don't know if you can get my code running on a D1 mini. The esp8266 has only on hardware serial port which is wired to the usb chip on a D1 mini.
As I understand it.. The Ecodan must have an 'Open Collector' output on the TX pin, ( https://en.wikipedia.org/wiki/Open_collector ) That is why you need a pull up, and don't see data if you don't have one. You can 'pull up' to any voltage you like ( within reason ), so if you pullup to 3v3, you get 3v3 logic levels, pull up to 5v0, get 5v0 logic levels. You can add a pull up resistor externally, or as the data rate is so low, and if your cable is short, the ESP8266 ( and others ) allows the option to enable an internal pullup. Using this, as the ESP8266 isn't 5v tolerant, you are sure you only get a 3v3 input to your D1 ( or similar ). For the Ecodan RX pin, it may be 3v3 logic on board, or 5v, but both see a 3v3 signal as logic 1, so there is no problem So my case I have both Rx and Tx directly connected, with "INPUT_PULLUP" set on the ESP8266 Rx pin, and it all seems to work OK
