Update README.md

components/TCA6408/README.md

@@ -11,9 +11,65 @@ Full-featured custom component for the **TCA6408** 8-bit I
 - Polling fallback mode
 - Compatible with ESP32 (including C3/C5/C6), ESP8266, etc.
 
+The INT pin on TCA6408 is open-drain active-low — connect a pull-up resistor (or use internal pull-up on ESP).
+
 ## Installation
 
 1. Download or clone this component into your ESPHome project:
    ```bash
    mkdir -p custom_components
-   cp -r TCA6408/custom_components/tca6408 custom_components/
+   cp -r TCA6408/custom_components/tca6408 custom_components/
+## Basic Configuration
+
+	i2c:
+	  sda: GPIO4
+	  scl: GPIO5
+	  scan: true
+	  frequency: 400kHz
+
+	custom_components:
+	  - source:
+	      type: local
+	      path: custom_components/tca6408
+
+	tca6408:
+	  - id: tca6408_hub
+	    address: 0x20                    # Default: 0x20 (0x20–0x27 depending on ADDR pins)
+	    interrupt_pin: GPIO6             # Recommended for fast input response
+
+## Example: Outputs (Switches)
+
+	switch:
+	  - platform: gpio
+	    name: "TCA6408 Output 0"
+	    pin:
+	      tca6408: tca6408_hub
+	      number: 0
+	      mode: OUTPUT
+
+	  - platform: gpio
+	    name: "TCA6408 Relay (Active Low)"
+	    pin:
+	      tca6408: tca6408_hub
+	      number: 1
+	      mode: OUTPUT
+	      inverted: true
+
+## Example: Inputs (Binary Sensors) with Interrupt
+
+	binary_sensor:
+	  - platform: gpio
+	    name: "Door Sensor"
+	    pin:
+	      tca6408: tca6408_hub
+	      number: 3
+	      mode: INPUT
+	      inverted: true           # Uses hardware polarity inversion
+
+	  - platform: gpio
+	    name: "Push Button"
+	    pin:
+	      tca6408: tca6408_hub
+	      number: 4
+	      mode: INPUT
+