May 2025 update: For those who wait: I redesigned the whole thing for only 6 channels but to be produced in bigger quantities. First prototype is currently in the making.

What is it?

I designed a Esphome based controller to controll the flow valves in a german standard warm water floor heater. This product is used in conjunction with homeassistant and an esphome instance at your home. It can controll 12 DC Channels with 24V and measure 12x ds18b12 probes. i2C is broken out for a 0.96" OLED display. Which can be used for troubleshooting. As the controller is normally build inside a wall there is not much need for it later.

Why did you make it?

I wanted to measure the temperature of every outgoing and incoming water pipe and regulate the valves to efficently heat my house.

What makes it special?

Its using mosfets for 24V valves and integrates fully into homeassistant. Design and Esphome-Code is open source and can be easily adopted and changed to your needs.

What you get with your order

You will get 1x assembled preflashed controller board. Preflashed with the esphome firmware. Powersupply,Valves and temperature probes are NOT included.

What else do you need to get you started?

You will need a 24V power supply capable of ~3A of current. Less if you are not using 12 Valves. The power supply needs a 5mm barrel jack output to be pluged into the board directly.

Heating valves with 230V AC are common and not compatible. You have to get 24V Valves. These are DC Valves with consume around 200mA when powered on.

To measure the in and outgoing pipes you can use wire and ds18b12 in To-92 package or you can order the waterproof ds18b12 which come with cables attached, but are quite overkill and expensive.

Code and automatic Build

The code is published on Github here: enter link description here

For further convinience the preflashed boards are checking the git and importing the code into your esphome instance as soon as you board is found in your network. This is not yet foolproof yet. If this works for you please let me know.

You can also just copy the code, or clone the repo.

You can also build this github code directly online and flash it with a usb-serial adapter on the board using this website Github Automatic Build