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WiFiThermostat

ESP8266 based, WiFi connected thermostat designed as replacement for electronic room thermostats used for most domestic heating systems.

Deutsche version

Features

current temperature/humidity measurement using a digital DHT22 type sensor
smoothing of measured values, filtering of
thermostat with configurable hysteresis and 3 modes with different set-point temperatures (normal, 2x reduction)
control unit with LCD and 3 pushbuttons
power unit with power supply and relais for heating control
telemetry via WiFi/MQTT (set temp, heating mode, heating on/off, PIR-sensor)
web interface for configuration and control
configuration and value changes also via MQTT and UART commands
PIR movement sensor for room surveillance can be attached, status is pushed via MQTT
initial configuration via WiFi AP mode with captive portal
non blocking WiFi and MQTT connection
built-in support for Home Assistant home automation server via MQTT, supports:
- set heating target temperature
- set heating mode
- local or webIF changes sends updates to HASS
- current temperature/humidity is reported
- PIR sensor state changes (if connected) are reported
built-in 2-way support for Domoticz Home Automation controller over MQTT
- set point and mode can be controlled from Domoticz
- local changes sending updates to Domoticz
- current temperature/humidity is reported to Domoticz
- PIR sensor state changes (if connected) are pushed to Domoticz
- designed to use Domoticz as the "intelligent" controller for schedules etc.
- NOW NOT UNDER ACTIVE DEVELOPMENT ANY MORE as I switched to Home Assistant
value changes (set point and mode, both from local and remote) can be automatically saved to flash

Hardware

Control Unit

To be installed instead of normal room thermostat. Uses 3 wires directly connected with Power Unit (+5V, GND, HEATING).

consists of:

small wall mount case
2x16 char LCD display
3 buttons (plus, minus, mode)
DHT22 temperature/humidity sensor
ESP8266 MCU (Wemos D1 mini)
transistor for relay

Power Unit

To be installed near or inside the actual heating. Power supply must be connected to power (230V), heating relay (2 wires) connects to room thermostat terminals on the heating controller. Supports all 5-240V AC/DC (but requires extra relay to switch high loads such as an electric heating!).