diff --git a/.gitignore b/.gitignore
index ae945fa..34f70f1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .idea/
 venv/
+.esphome/
diff --git a/co2-sensor.yaml b/co2-sensor.yaml
new file mode 100644
index 0000000..6574154
--- /dev/null
+++ b/co2-sensor.yaml
@@ -0,0 +1,114 @@
+esphome:
+  name: co2-sensor-raum3
+  friendly_name: "CO2 Sensor Raum 3"
+  area: "Raum 3"
+  on_boot:
+    - priority: -100
+      then:
+        - light.turn_on: {
+            id: co2_sensor_raum3_led,
+            red: 0%, green: 0%, blue: 100%
+          }
+
+esp8266:
+  board: d1_mini
+
+# Enable logging
+logger:
+  baud_rate: 0
+
+# Enable Home Assistant API
+api:
+  password: ""
+  services:
+    - service: calibrate
+      then:
+        - mhz19.calibrate_zero: co2_sensor_raum3_sensor
+
+ota:
+  - platform: esphome
+    password: !secret ota_password
+
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+
+  # Enable fallback hotspot (captive portal) in case wifi connection fails
+  ap:
+    ssid: "CO2 Sensor Raum 3 Fallback"
+    password: !secret ap_password
+
+  manual_ip:
+    static_ip: 172.23.23.31
+    gateway: 172.23.23.1
+    subnet: 255.255.255.0
+
+captive_portal:
+    
+uart:
+  rx_pin: GPIO3
+  tx_pin: GPIO1
+  baud_rate: 9600
+
+sensor:
+  - platform: mhz19
+    id: co2_sensor_raum3_sensor
+    co2:
+      id: co2_sensor_raum3_messwert
+      name: "Messwert"
+      on_value_range:
+        - below: 700
+          then:
+            - light.turn_on: {
+                id: co2_sensor_raum3_led,
+                red: 32%, green: 57%, blue: 12%,
+                effect: none
+              }
+        - above: 700
+          below: 1200
+          then:
+            - light.turn_on: {
+                id: co2_sensor_raum3_led,
+                red: 96%, green: 76%, blue: 6%,
+                effect: none
+              }
+        - above: 1200
+          below: 1500
+          then:
+            - light.turn_on: {
+                id: co2_sensor_raum3_led,
+                red: 100%, green: 12%, blue: 0%,
+                effect: none
+              }
+        - above: 1500
+          then:
+            - light.turn_on: {
+                id: co2_sensor_raum3_led,
+                red: 100%, green: 12%, blue: 0%,
+                effect: blink
+              }
+    temperature:
+      id: co2_sensor_raum3_temperatur
+      name: "Temperatur"
+    update_interval: 60s
+    automatic_baseline_calibration: false
+
+light:
+  - platform: neopixelbus
+    id: co2_sensor_raum3_led
+    name: "LED"
+    type: GRB
+    variant: WS2812
+    pin: D2
+    num_leds: 7
+    effects:
+      - pulse:
+          name: blink
+          transition_length: 0s
+          update_interval: 1s
+
+binary_sensor:
+  - platform: gpio
+    id: co2_sensor_raum3_button
+    name: "Button"
+    pin: D6