An ESPHome custom component for monitoring Daikin Altherma heat pumps via the X10A connector. Exposes temperatures, voltages, currents, and diagnostics directly to Home Assistant.

For hardware requirements, wiring diagrams, and full documentation, see the GitHub repository.

Supported Boards

• ESP32 DevKit
• ESP32-S3 DevKit
• M5Stack AtomS3 Lite

Browser Install

Flash the firmware directly from your browser — no tools required.

1. Connect your ESP32 board to your computer via USB
2. Click the Connect button below and select the serial port
3. Follow the prompts to install the firmware and configure Wi-Fi

Note: Browser installation requires a Chromium-based browser (Chrome, Edge, etc.) with Web Serial support.

After Installation

1. The device will appear in Home Assistant under Settings → Devices & Services as a discovered ESPHome device
2. Click Configure to add it
3. All sensors will be available as Home Assistant entities

For OTA updates, reconnect the board and click Connect above, then select Update.