An IR blaster to control my Mitsubishi Airco unit in my Office via MQTT. To have it blend in, I've used a R2D2 USB vacuum cleaner to hide the circuits. The location for the power LED was used to place the IR LED and I've installed a DHT11 temperature sensor at the air vent.

The code is based on the following GitHub repository where I added the MQTT functionality: https://github.com/r45635/HVAC-IR-Control

• Wemos D1 Mini
• IR LED 940 nm 5 mm
• DHT11 or DHT22
• 10k Ohm Resistor for DHT11 pull up
• 330 Ohm Resistor for IR LED
• 2N2222A NPN
• R2-D2 Desktop Vacuum
• Wires

To control the airco unit from Home Assistant, i've added the following YAML into my configuration file.

climate:
 - platform: mqtt
   name: Office
   modes:
     - "off"
     - "cool"
     - "heat"
   mode_command_topic: "climate/R2D2/mode/set"
   mode_state_topic: "climate/R2D2/mode/state"
   temperature_command_topic: "climate/R2D2/temperature/set"
   temperature_state_topic: "climate/R2D2/temperature/state"
   current_temperature_topic: "climate/R2D2/temperature/sensor"
   current_temperature_template: "{{ value_json.Temperature }}"
   initial: 21
   max_temp: 31
   min_temp: 16