Updates

components/TCA6408/README.md

@@ -0,0 +1,33 @@
+# 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
+
+```yaml
+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