WebThing Thermostat is prepared for ESP32 CPUs and uses esp-idf environment (current stable version: 4.1).
Thermostat keeps the temperature around the set value by turning the heat source ON and OFF. Temperature is measured with DS18B20 1-wire temperature sensor.
Requires:
- web-thing-server from
webthings-components - esp32-owb for 1-wire bus
- esp32-ds18b20 for DS18B20 sensor
See webthings-node-example-project
This webThing has the following properties and one action:
- Target temperature (Ts)
- Temperature (Tc), current temperature read from sensor
- Hysteresis (dT x 10), controller will try to maintain the temperature in the range from Ts - (dT/10) to Ts + (dT/10), e.g. Ts = 15, dT = 20, then T_high = 15 + 2 = 17, T_low = 15 - 2 = 13, it turns OFF the heater when Tc > 17 and turns ON the heater when Tc < 13
- mode:
- AUTO, temperature is regulated around Ts
- HEAT, heater is ON, regardless of Tc
- OFF, heater is OFF, regardless of Tc
- Heating, shows if heating is ON or OFF
- ON minutes, minutes when heater was ON for the current day, cleared on midnight
- Timer (action), turn ON the heater for a certain number of minutes
See webthings-empty-project and follow steps described in Build webThing Device chapter.
In point 5 download webthing-thermostat repository. In function init_things() call init_thermostat() and include thing_thermostat.h in your main project file.
The source is available from GitHub.
In the prototype folder there are schematic files, gerber files and a photo of the working prototype device. This device is built with ESP32 DevKitC.
- WebThing Gateway - https://webthings.io/gateway/
- Web Thing API - https://webthings.io/api/
- esp-idf - https://github.com/espressif/esp-idf
This project is licensed under the MIT License.
- Krzysztof Zurek - github