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A little project to connect a DS18B20 via ESP8266 to a Homematic CCU

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thkl/ESP8266_CCU_Thermometer

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ESP8266_CCU_Thermometer

Compiling

PlatformIO: this project is ready to use on PlatformIO.

ArduinoIDE: src/* is what you need. You have to add WifiManager and DallasTemperature to your libraries.

Config

Just connect with your phone to the AccessPoint ESP_Thermometer.

You have to setup your Wifi, CCU IP and variable name.

CCU

Create a variable of type number for saving the current temperature. (eg. ESP_Thermometer).

To monitor the current voltage connect A0 via a 220kO resistor to 3.3V . To save this value to ccu create a 2nd variable with the same name but a "Bat_" Prefix (eg. Bat_ESP_Thermometer). If you don't want to monitor the voltage set BATT_LEVEL to 0.

Sleep

After saving the current temperature the ESP will go to deep sleep for 60 minutes to save battery life.

You may change the sleep time via SLEEP_TIME variable.

Reset To default : Press and hold the ResetSettings Button (connected to PIN D2) and reset the ESP (or powercycle)

Todo

  • config for sleep time
  • config for battery level
  • create ccu variables if they are not present

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A little project to connect a DS18B20 via ESP8266 to a Homematic CCU

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