Add kitchen unit

Runs the underfloor heating and humidity sensor above the cooker (which
will be used to trigger the extractor fan)

diff --git a/kitchen.yaml b/kitchen.yaml
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+#
+# https://www.aliexpress.com/item/1005004099215436.html
+#
+# GPIO23: Onboard blue LED (used to show MQTT connectivity)
+# GPIO16: Onboard relay (UFH)
+# GPIO25: Used as output for NTC bridge
+# GPIO32: ADC, midpoint of NTC bridge
+# GPIO33: DHT22 for cooker humidity/temp
+#
+# The underfloor heating NTC thermistor is connected as follows:
+#
+#    GPIO25 (3.3v)
+#      |
+#      ▯ 10 kΩ fixed resistor
+#      |
+#      --- GPIO32 (ADC)
+#      |
+#      ▯ 10 kΩ NTC under floor
+#      |
+#      ⏚  GND
+#
+# Rather than leaving current flowing through the thermistor at all times and
+# potentially introducing errors by warming it up, we only turn GPIO25 on
+# when it's time to take a reading.
+#
+# So we disable the periodic measurement on the ADC sensor, then periodically
+# turn on GPIO25, trigger *three* readings a second apart, and turn GPIO25 off
+# again. The ADC sensor has a filter to average the three readings.
+
+substitutions:
+  name: kitchen
+  room_name: "Kitchen"
+  domo_ufh: "916"
+  domo_temp: "917"
+  domo_thresh: "915"
+  
+esphome:
+  name: ${name}
+
+esp32:
+  board: esp32-gateway
+  framework:
+    type: esp-idf
+
+packages:
+  base: !include base.yaml
+
+wifi:
+  power_save_mode: none
+  networks:
+    - ssid: !secret wifi_ssid
+      password: !secret wifi_pw
+      bssid: !secret wndr3800_bssid
+      priority: 1
+
+script:
+  - id: back_to_auto
+    mode: restart
+    then:
+      - delay: 30 min
+      - climate.control:
+          id: ntc_climate
+          mode: HEAT
+
+time:
+  - platform: sntp
+    on_time:
+      - seconds: 0
+        minutes: 0
+        hours: 6
+        then:
+          climate.control:
+            id: ntc_climate
+            mode: HEAT
+            target_temperature: 21°C
+
+      - seconds: 0
+        minutes: 30
+        hours: 09
+        then:
+          climate.control:
+            id: ntc_climate
+            mode: HEAT
+            target_temperature: 10°C
+
+mqtt:
+  on_connect:
+    then:
+      - light.turn_on: blue_led
+      - delay: 2s # Too soon and the first messages don't get through!
+      - lambda: |-
+         id(tell_domo_nvalue)->execute(${domo_ufh}, id(ufh_relay).state);
+         id(tell_domo_svalue)->execute(${domo_thresh},
+                                       std::to_string(id(ntc_climate).target_temperature));
+
+  on_disconnect:
+    then:
+      - light.turn_off: blue_led
+
+  on_json_message:
+    - topic: domoticz/out
+      then:
+        - lambda: |-
+            int idx = x["idx"];
+            int nvalue = x["nvalue"].as<int>();
+
+            // ESP_LOGD("on_json_message", x["name"]);
+            switch (idx) {
+               case ${domo_ufh}: /* UFH relay */
+                  if (nvalue) {
+                    id(ufh_relay).turn_on();
+                  } else {
+                    id(ufh_relay).turn_off();
+                  }
+                  {
+                  auto offcall = id(ntc_climate).make_call();
+                  offcall.set_mode("OFF");
+                  offcall.perform();
+                  }
+                  id(back_to_auto).execute();
+                  break;
+
+                case ${domo_thresh}: /* Temperature setpoint */
+                  double temp = x["svalue1"].as<double>();
+                  auto call = id(ntc_climate).make_call();
+                  call.set_mode("HEAT");
+                  call.set_target_temperature(temp);
+                  call.perform();
+                  ESP_LOGD("mqtt", "Got temp_setpoint %f", temp);
+                  break;
+            }
+
+light:
+  - platform: status_led
+    pin: GPIO23
+    id: blue_led
+    restore_mode: ALWAYS_OFF
+
+switch:
+  - platform: gpio
+    id: ntc_vcc
+    pin: GPIO25
+    restore_mode: ALWAYS_OFF
+
+  - platform: gpio
+    name: "Kitchen UFH"
+    id: ufh_relay
+    pin: GPIO16
+    restore_mode: ALWAYS_OFF
+    on_turn_on:
+      then:
+        - lambda: |-
+            id(tell_domo_nvalue)->execute(${domo_ufh}, 1);
+    on_turn_off:
+      then:
+        - lambda: |-
+            id(tell_domo_nvalue)->execute(${domo_ufh}, 0);
+
+sensor:
+  - platform: dht
+    pin:
+      number: GPIO33
+      mode:
+        input: true
+        pullup: true
+    model: DHT22
+    temperature:
+      name: "${room_name} Temperature"
+    humidity:
+      name: "${room_name} Humidity"
+    update_interval: 10s
+
+  - platform: ntc
+    id: ntc_temperature
+    sensor: ntc_resistance
+    calibration:
+    # Hiwell E91.716 gives these in detail. The SunStone Touchstat manual just says
+    # "10kΩ at 25°C, 12.1kΩ at 20°C, 14.7kΩ at 15°C, which looks basically the same.
+    # ESPHome only wants three.
+    # - 22.0706 kOhm -> 5°C
+    # - 17.9600 kOhm -> 10°C
+ #     - 14.6962 kOhm -> 15°C
+ #     - 12.0911 kOhm -> 20°C
+ #     - 10.0000 kOhm -> 25°C
+    # -  8.3124 kOhm -> 30°C
+    # -  6.9434 kOhm -> 35°C
+    # -  5.82525 kOhm -> 40°C
+    # Actual readings from SunStone Touchstat
+     -  15.0  kOhm -> 13.9°C
+#    - 12.55 kOhm - > 17.6°C
+     -  12.30 kOhm -> 18.2°C
+     -  9.97  kOhm -> 23.5°C
+    filters:
+      - exponential_moving_average:
+          send_every: 1
+          send_first_at: 1
+      - clamp:
+          min_value: 5
+          max_value: 35
+          ignore_out_of_range: true
+    on_value:
+      then:
+        lambda: |-
+          if (!isnan(x))
+            id(tell_domo_svalue)->execute(${domo_temp}, std::to_string(x));
+
+  - platform: resistance
+    id: ntc_resistance
+    sensor: ntc_adc
+    reference_voltage: 3.28v # measured
+    resistor: 9.97 kOhm
+    configuration: DOWNSTREAM
+    filters:
+      - median:
+          window_size: 5
+          send_every: 5
+          send_first_at: 5
+
+  - platform: adc
+    id: ntc_adc
+    attenuation: 12dB
+    update_interval: never
+    pin: GPIO32
+    filters:
+      - multiply: 0.987 # Calibrated vs. multimeter
+      # 0.80 -> 0.78
+      # 2.52 -> 2.49
+      # 1.99 -> 1.96
+
+climate:
+  - platform: thermostat
+    id: ntc_climate
+    name: "Kitchen floor"
+    sensor: ntc_temperature
+    min_heating_off_time: 300s
+    min_heating_run_time: 300s
+    min_idle_time: 30s
+    heat_deadband: 0.2°C
+    heat_action:
+      - switch.turn_on: ufh_relay
+    idle_action:
+      - switch.turn_off: ufh_relay
+    on_control:
+      - lambda: |-
+           auto temp = x.get_target_temperature();
+           if (temp && temp.value() != id(ntc_climate).target_temperature) {
+             ESP_LOGI("CLIMATE", "on_control, set target %f to %f",
+                               id(ntc_climate).target_temperature, temp.value());
+             id(tell_domo_svalue)->execute(${domo_thresh},
+                                         std::to_string(temp.value()));
+           }
+
+
+interval:
+  - interval: 60s
+    then:
+      - switch.turn_on: ntc_vcc
+      - delay: 1s
+      - component.update: ntc_adc
+      - delay: 0.5s
+      - component.update: ntc_adc
+      - delay: 0.5s
+      - component.update: ntc_adc
+      - delay: 0.5s
+      - component.update: ntc_adc
+      - delay: 0.5s
+      - component.update: ntc_adc
+      - switch.turn_off: ntc_vcc
+
+