This project is designed to control an underfloor heating system using an ESP32 running ESPHome. The system connects an ESP32 with a relay board (or, preferably, SSRs) to control the heating valves of a floor heating system. By reusing the pre-existing wiring for Dallas temperature sensors, each room can continuously report its current temperature. The climate device then uses this data to manage heating.
- Control of underfloor heating via an ESP32 connected to a relay/SSR board.
- Utilization of Dallas temperature sensors with existing wiring.
- Two-point regulation strategy: optimized for the inherent sluggish response of underfloor heating.
- Fully standalone operation on the ESP, ensuring continued performance even if Home Assistant is offline.
- A modular configuration structure optimized for multi-storey buildings, avoiding repetitive configuration across floors.
- underfloorheating.yaml: The main configuration file that sets substitutions, ESP settings, sensors, and includes common packages.
- common/*: Contains modular YAML files:
sensor_generic.yaml: Common sensor settings.network_generic.yaml: Network settings including WiFi and OTA configuration.underfloor_heating_termostat.yaml: Common thermostat settings for the heating control.underfloor_heating_generic.yaml: Configuration for the climate devices and switches controlling the heating valves.
- LICENSE: Contains the GNU General Public License for the project.
- Flash the ESP32 with the provided ESPHome configuration.
- Connect the ESP32 to a relay board or SSRs and interface it with the heating valves.
- The controller board is housed in the large enclosure shown in the image of the heating manifold.
- The controller board is housed in the large enclosure shown in the image of the heating manifold.
- Install Dallas temperature sensors using the existing wiring in your building.
- The temperature sensors are all connected in the additional junction box with the Wago connectors.
- To obtain the OneWire sensor addresses, connect one sensor at a time. Then, check the ESPHome logs for the sensor's ID and assign it to the corresponding room in your configuration. Repeat this process for each sensor.
- The temperature sensors are all connected in the additional junction box with the Wago connectors.
- Adjust network settings and substitutions in
underfloorheating.yamlto match your environment. - Start the system and enjoy a smart, efficient, and cost-effective heating solution!
- The USB power supply for the controller board can be seen glowing in the image of the heating manifold.
The hardware required for this project is very cost-effective, with a total cost of under 50€. The main components include:
- ESP32 microcontroller
- Relay board or SSRs
- Dallas temperature sensors
- 5V USB power supply
- some Wagos + installation material
Additionally, a printable cover (UP-Dose Abdeckung.stl) is available, which fits standard German wall boxes and includes a holder for the OneWire sensors.
If you need any clarifications or further information, please ask.
Happy heating control!