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Jul 29, 2026
2 min read
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Home automation: Integrating a Daikin heat pump using ESP32 and a local web interface
From classic control to total autonomy in Smart Home
In an age where most smart devices depend on external clouds, proprietary apps, and permanent internet connections, I decided to take a different approach to home automation. One of the recent projects I completed was fully integrating a Daikin heat pump into a local ecosystem using an ESP32 microcontroller and a dedicated web interface.
The initial challenge
Modern air conditioning systems often come with official Wi-Fi modules, but they come with major disadvantages:
Dependence on external servers (if the internet or cloud service goes down, you lose control). Closed protocols and lack of native and flexible integration with other local platforms. High response time due to data routing through external servers.
The technical solution: ESP32 + Local Web Interface
To cut out any middleman, I chose to use an ESP32 — a powerful, inexpensive, and highly versatile microcontroller equipped with built-in Wi-Fi and Bluetooth. Hardware Interface: I connected the microcontroller directly to the data bus of the heat pump, creating a safe physical bridge for receiving and sending commands.
Included Web Server: The ESP32 runs a minimalist, speed-optimized web server that hosts a graphical interface accessible from any browser on the local network (phone, tablet, or PC). Total and Instant Control: From setting the temperature, changing operating modes (heating/cooling/ventilating), to monitoring the system status in real time, everything happens instantly, without a second of latency.
The advantages of local architecture
Absolute confidentiality (Privacy): No cubic meter of data or consumption habits leaves the home's local network. 100% Reliability: The system works perfectly even in case of a total internet outage. Minimal power consumption: The entire assembly consumes a few watts, running stably 24/7.
Conclusion
This project proves that with a DIY (Do-It-Yourself) approach and a little passion for hardware, you can turn a classic home appliance into a truly smart one while keeping absolute control over your own home.
In an age where most smart devices depend on external clouds, proprietary apps, and permanent internet connections, I decided to take a different approach to home automation. One of the recent projects I completed was fully integrating a Daikin heat pump into a local ecosystem using an ESP32 microcontroller and a dedicated web interface.
The initial challenge
Modern air conditioning systems often come with official Wi-Fi modules, but they come with major disadvantages:
Dependence on external servers (if the internet or cloud service goes down, you lose control). Closed protocols and lack of native and flexible integration with other local platforms. High response time due to data routing through external servers.
The technical solution: ESP32 + Local Web Interface
To cut out any middleman, I chose to use an ESP32 — a powerful, inexpensive, and highly versatile microcontroller equipped with built-in Wi-Fi and Bluetooth. Hardware Interface: I connected the microcontroller directly to the data bus of the heat pump, creating a safe physical bridge for receiving and sending commands.
Included Web Server: The ESP32 runs a minimalist, speed-optimized web server that hosts a graphical interface accessible from any browser on the local network (phone, tablet, or PC). Total and Instant Control: From setting the temperature, changing operating modes (heating/cooling/ventilating), to monitoring the system status in real time, everything happens instantly, without a second of latency.
The advantages of local architecture
Absolute confidentiality (Privacy): No cubic meter of data or consumption habits leaves the home's local network. 100% Reliability: The system works perfectly even in case of a total internet outage. Minimal power consumption: The entire assembly consumes a few watts, running stably 24/7.
Conclusion
This project proves that with a DIY (Do-It-Yourself) approach and a little passion for hardware, you can turn a classic home appliance into a truly smart one while keeping absolute control over your own home.