WiFi IR Remote for Tosot AC for Home Assistant (ESPHome DIY Project)

Description

I built a WiFi IR remote control for my Tosot Air Conditioner (Tosot Twin AG12) using IR Remote Climate component from ESPHome and Home Assistant.

The IR remote control is based on an ESP8266 board (Wemos LoLin D1 R2 & Mini). It's a DIY project, so you need to solder the parts together.

Check, if your Tosot Air Conditioner is compatible with the IR Remote Climate component of ESPHome.

Pictures

Interface in Home Assistant

This interface comes from the IR Remote Climate component of ESPHome and is used to control my Tosot Air Conditioner.

Case for the IR Remote Control

The Case was designed by me. Find it here on thingyverse. Note: The A/C Logo is not included in the 3D model.

Note: The green LED is just a power indicator and NOT an essential part of the ir remote control. In the diagrams and item list below, it is not mentioned.

My soldering solution for the IR remote control (can be improved, but it works)

Notes:

• There is one electrolytic capacitor too much soldered, it was a mistake, but I was to lazy to remove it. See Fritzing diagram below for the correct wiring. The correct electrolytic capacitor needs to be connected to the 5 V of the ESP8266 board.
• The green LED is just a power indicator and NOT an essential part of the ir remote control. In the diagrams and item list below, it is not mentioned.

Requirements

• Home Assistant 2025.5.0 or later (earlier versions may work but are not tested)
• Installed ESPHome add-on in Home Assistant
• Tosot Air Conditioner with IR remote control
  (Adapt it to your specific device in esphome-ir-remote.yaml config)
• ESP8266-based board (like Wemos LoLin D1 R2 & Mini).
  (Adapt it to your specific device in esphome-ir-remote.yaml config)
• see parts list below for soldering

Building it together!

Parts for soldering

• 1x ESP8266 board (e.g., Wemos LoLin D1 R2 & Mini)
• 1x Grid hole board
• 2x IC Sockets (optional, but recommended for easy replacement of the ESP8266 board)
• 1x PCB Screw Terminal Block (optional, but recommended for easy connection of the IR LED)
• 1x IR LED (e.g., IR 7373C EVL)
• 1x Electrolytic capacitor (10 µF)
• 1x Resistor ≈ 20 Ω (for IR LED)
• 1x Resistor 1 kΩ (as pull-down)
• 1x Resistor ≈ 100 Ω (as pre-resistor after the D7 pin)
• 1x Mosfet (e.g., IRF 540N)

Fritzing Diagram

You need to adapt this Fritzing diagram to your specific grid hole board. This is just a demonstration of how the parts should be connected.

Some Soldering Instructions

Note: All resistors and capacitors are calculated for my specific board and IR combination. You may need to adjust them for your specific need.

• Connect the "Source" pin of the Mosfet to the GND of the ESP8266 board.
• The 'Drain' pin of the Mosfet is the power supply for the IR LED. Remember to add a ≈ 20 Ω resistor in series to the IR LED.
• Connect the 'Gate' pin of the Mosfet to the D7 pin of the ESP8266 board and add a pre-resistor of ≈ 100 Ω to this line (green wireing). Additionally, add a pull-down resistor of 1 kΩ to the GND of the ESP8266 board.

Have fun soldering! See you in the next section!

Source Code / YAML Config for IR Remote Control

Source file: esphome-ir-remote.yaml

For Installation of a generic ESPHome device, reed the dokumentation here: https://esphome.io/guides/getting_started_hassio.

• First install ESPHome on your Microcontroller (e.g., Wemos LoLin D1 R2 & Mini) and connect it to your Home Assistant instance. (It must be listed in the ESPHome Device Builder on your Home Assistant instance.)
• Adjust the esphome-ir-remote.yaml file to your needs, especially the WiFi credentials and the IR remote control settings.
• Then copy your adapted config file by "EDIT" your specific ESPHome Device in your ESPHome Device Builder and upload it.

esphome:
  name: tosot-twinag12-ir-remote
  friendly_name: ESPHome IR AC Control
  min_version: 2025.5.0
  name_add_mac_suffix: false


# Define your ESP board here
esp8266:
  board: d1_mini

# Enable logging
logger:

# Enable Home Assistant API
api:

# Allow Over-The-Air updates
ota:
  - platform: esphome

wifi:
  ssid: 'add_your_wifi_ssid_here'
  password: 'add_your_wifi_password_here'

remote_transmitter:
  id: retx
  pin:
    number: D7

  carrier_duty_percent: 50%

# Read the documentation to set up to your AC model
# see: https://esphome.io/components/climate/climate_ir.html
climate:
  - platform: gree
    name: "Living Room AC"
    model: yac
    icon: "mdi:air-conditioner"
    supports_heat: false

License

Copyright (c) 2025 Paul Schulze This project is licensed under the MIT License.