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TCA6408 ESPHome Component

Full-featured custom component for the TCA6408 8-bit I²C I/O Expander.

Features

• 8 bidirectional GPIO pins
• Hardware polarity inversion (inputs)
• Interrupt-driven inputs (active-low)
• Polling fallback
• Cached GPIO expander (efficient)
• Works on ESP32 (incl. C5), ESP8266, etc.

Installation

Copy the tca6408 folder into your ESPHome project's custom_components/ directory.

Basic Configuration

i2c:
  sda: GPIO4
  scl: GPIO5
  scan: true

custom_components:
  - source:
      type: local
      path: custom_components/tca6408

tca6408:
  - id: tca6408_hub
    address: 0x20                    # 0x20–0x27 depending on ADDR pins
    interrupt_pin: GPIO6             # Recommended for responsive inputs