Automatischer Taupunkt-Lüfter – Smarthome DIY

sudo apt remove brltty #removes brltty, do not remove if you need this because of blindness!

esphome:
  name: esp-fan-controller

esp8266:
  board: d1_mini
  #board: nodemcuv2

# Enable logging
logger:
  tx_buffer_size: 256
  #level: NONE
  #level: VERBOSE

web_server:
  port: 80

ota:
#  password: ""

wifi:
  networks:
  - ssid: "XXXXX"
    password: "XXXXX"
  reboot_timeout: 2min


#https://esphome.io/components/i2c/
i2c:
  id: i2c_main
  scl: D1
  sda: D2
  scan: true
  frequency: 20kHz

tca9548a:
  - address: 0x70
    id: multiplex0
    i2c_id: i2c_main
    channels:
      - bus_id: i2c_0
        channel: 2
      - bus_id: i2c_1
        channel: 3
      
sensor:
  - platform: uptime
    id: uptime_id
    name: "Uptime"
    update_interval: 15s
      
  #BME/P280
  #https://esphome.io/components/sensor/bme280/
  - platform: bme280
    i2c_id: i2c_0
    temperature:
      name: "BME-T 2 (out)"
      id: bme280_0_temperature
      oversampling: 8x
      filters:
        - filter_out: NaN
    pressure:
      name: "BME-P 2 (out)"
      id: bme280_0_pressure
      filters:
        - filter_out: NaN
    humidity:
      name: "BME-H 2 (out)"
      id: bme280_0_humidity
      filters:
        - filter_out: NaN
    address: 0x76
    update_interval: 30s
  - platform: template
    name: "Dew Point 2 (out)"
    id: bme280_0_dewpoint
    lambda: |-
      return (243.5*(log(id(bme280_0_humidity).state/100)+((17.67*id(bme280_0_temperature).state)/
      (243.5+id(bme280_0_temperature).state)))/(17.67-log(id(bme280_0_humidity).state/100)-
      ((17.67*id(bme280_0_temperature).state)/(243.5+id(bme280_0_temperature).state))));
    unit_of_measurement: °C
    icon: 'mdi:thermometer-alert'
    filters:
      - filter_out: NaN
  - platform: bme280
    i2c_id: i2c_1
    temperature:
      name: "BME-T 3 (in)"
      id: bme280_1_temperature
      oversampling: 8x
      filters:
        - filter_out: NaN
    pressure:
      name: "BME-P 3 (in)"
      id: bme280_1_pressure
      filters:
        - filter_out: NaN
    humidity:
      name: "BME-H 3 (in)"
      id: bme280_1_humidity
      filters:
        - filter_out: NaN
    address: 0x76
    update_interval: 30s
  - platform: template
    name: "Dew Point 3 (in)"
    id: bme280_1_dewpoint
    lambda: |-
      return (243.5*(log(id(bme280_1_humidity).state/100)+((17.67*id(bme280_1_temperature).state)/
      (243.5+id(bme280_1_temperature).state)))/(17.67-log(id(bme280_1_humidity).state/100)-
      ((17.67*id(bme280_1_temperature).state)/(243.5+id(bme280_1_temperature).state))));
    unit_of_measurement: °C
    icon: 'mdi:thermometer-alert'
    filters:
      - filter_out: NaN


button:
  #https://esphome.io/components/button/restart/
  - platform: restart
    name: "Restart"
    
switch:
  #Digital Pins
  - platform: gpio
    id: gpio_d4
    name: "Fans"
    pin: D4


http_request:  
  id: http_request_data
  useragent: esphome/device
  timeout: 10s

interval:
  - interval: 30s
    then:
      - if:
          condition:
            lambda: |-
              return id(bme280_0_dewpoint).state + 2.0 < id(bme280_1_dewpoint).state;
          then:
            - switch.turn_on: gpio_d4
          else:
            - switch.turn_off: gpio_d4
  - interval: 30s
    then:
      - http_request.post:
          url: !lambda |-
            const size_t capacity = JSON_OBJECT_SIZE(10);
            DynamicJsonDocument root(capacity);

            root["name"] = "NeuensteinKeller";
            root["uptime"] = id(uptime_id).state;
            root["bme280_0_temperature"] = id(bme280_0_temperature).state;
            root["bme280_0_pressure"] = id(bme280_0_pressure).state;
            root["bme280_0_humidity"] = id(bme280_0_humidity).state;
            root["bme280_0_dewpoint"] = id(bme280_0_dewpoint).state;
            root["bme280_1_temperature"] = id(bme280_1_temperature).state;
            root["bme280_1_pressure"] = id(bme280_1_pressure).state;
            root["bme280_1_humidity"] = id(bme280_1_humidity).state;
            root["bme280_1_dewpoint"] = id(bme280_1_dewpoint).state;

            String jsonPayload;
            serializeJson(root, jsonPayload);

            return ((String) "https://mystryx.dd-dns.de/files/json_receiver/?name=NeuensteinKeller&json=" + jsonPayload).c_str();
            
          headers:
            Content-Type: application/json
          verify_ssl: false
          json: |-
            root["name"]                = "NeuensteinKeller";
            root["uptime"]              = id(uptime_id).state;
            root["bme280_0_temperature"]= id(bme280_0_temperature).state;
            root["bme280_0_pressure"]   = id(bme280_0_pressure).state;
            root["bme280_0_humidity"]   = id(bme280_0_humidity).state;
            root["bme280_0_dewpoint"]   = id(bme280_0_dewpoint).state;
            root["bme280_1_temperature"]= id(bme280_1_temperature).state;
            root["bme280_1_pressure"]   = id(bme280_1_pressure).state;
            root["bme280_1_humidity"]   = id(bme280_1_humidity).state;
            root["bme280_1_dewpoint"]   = id(bme280_1_dewpoint).state;

// Taupunkte
Number:Temperature    WetterstationDewPoint     "Taupunkt Außen [%.2f °C]"    <rain>          { channel="mqtt:topic:myMosquitto:Arduino_55:dew_point" }
Number:Temperature    Keller_DewPoint           "Taupunkt Keller [%.2f °C]"   <rain>          { channel="mqtt:topic:myMosquitto:Arduino_57:dew_point" }

// Temperaturen (für Unterkühlungsschutz)
Number:Temperature    WetterstationTemperature  "Außentemperatur [%.1f °C]"   <temperature>   { channel="mqtt:topic:myMosquitto:Arduino_55:temperature" }
Number:Temperature    Keller_Temperature        "Kellertemperatur [%.1f °C]"  <temperature>   { channel="mqtt:topic:myMosquitto:Arduino_57:temperature" }

// Relais-Aktor für Lüfter
Switch                Keller_Luefter_Switch     "Kellerlüfter [%s]"           <fan>           { channel="mqtt:topic:myMosquitto:esphome_fan:relay" }

const { rules, triggers, items, Quantity } = require('openhab');

// Schwellwerte und Hysteresen
const DELTA_ON  = 2.0; // Lüfter AN wenn Keller-Taupunkt mindestens 2.0 °C über Außen-Taupunkt liegt
const DELTA_OFF = 0.8; // Lüfter AUS sobald Differenz unter 0.8 °C fällt (Hysterese)
const MIN_CELLAR_TEMP = 12.0; // Verhindert Auskühlen des Kellers im Winter
const MIN_OUTDOOR_TEMP = 2.0; // Frostschutz: Keine eisige Außenluft einblasen

rules.JSRule({
    name: "Automatischer Taupunkt-Lüfter",
    description: "Steuert Kellerlüftung basierend auf Taupunktdifferenz mit Hysterese und Frostschutz",
    triggers: [
        triggers.GenericCronTrigger("0 */5 * * * ?"), // Alle 5 Minuten prüfen
        triggers.ItemStateChangeTrigger("WetterstationDewPoint"),
        triggers.ItemStateChangeTrigger("Keller_DewPoint")
    ],
    execute: () => {
        const itemDewOut   = items.getItem("WetterstationDewPoint");
        const itemDewIn    = items.getItem("Keller_DewPoint");
        const itemTempOut  = items.getItem("WetterstationTemperature");
        const itemTempIn   = items.getItem("Keller_Temperature");
        const itemFan      = items.getItem("Keller_Luefter_Switch");

        // Sicherheitsprüfung: Alle Items initialisiert?
        if (itemDewOut.isUninitialized || itemDewIn.isUninitialized ||
            itemTempOut.isUninitialized || itemTempIn.isUninitialized) {
            return;
        }

        const dewOut   = itemDewOut.numericState;
        const dewIn    = itemDewIn.numericState;
        const tempOut  = itemTempOut.numericState;
        const tempIn   = itemTempIn.numericState;
        const fanState = itemFan.state;

        // 1. Unterkühlungs- & Frostschutz prüfen
        if (tempIn < MIN_CELLAR_TEMP || tempOut < MIN_OUTDOOR_TEMP) {
            if (fanState === 'ON') {
                console.info("[Taupunkt-Lüfter] Unterkühlungsschutz aktiv: Lüfter wird abgeschaltet.");
                itemFan.sendCommand('OFF');
            }
            return;
        }

        // 2. Taupunktdifferenz berechnen (Innentaupunkt minus Außentaupunkt)
        const diff = dewIn - dewOut;

        // 3. Einschaltbedingung mit Hysterese
        if (diff >= DELTA_ON && fanState !== 'ON') {
            console.info([Taupunkt-Lüfter] Optimales Lüftungswetter: Diff=°C (In: °C, Out: °C). Lüfter AN.);
            itemFan.sendCommand('ON');
        } 
        // 4. Abschaltbedingung (Differenz zu gering oder Feuchteeintrag droht)
        else if (diff <= DELTA_OFF && fanState === 'ON') {
            console.info([Taupunkt-Lüfter] Differenz zu gering (Diff=°C). Lüfter AUS.);
            itemFan.sendCommand('OFF');
        }
    }
});