Initial commit: ESP32-C5-EVB and ESP32-C6-EVB Arduino firmware + HA custom components

olimex_ESP32-C6-EVB/README.md

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+# Olimex ESP32-C6-EVB — Home Assistant Integration
+
+This repository contains two components:
+
+## `custom_components/olimex_esp32_c6`
+Home Assistant custom integration for the **Olimex ESP32-C6-EVB** board.
+
+- 4 relay switches (controlled via HTTP POST to the board)
+- 4 digital inputs (state pushed from board to HA via webhook)
+- No polling — fully event-driven for inputs, command-driven for relays
+
+### Installation
+Copy `custom_components/olimex_esp32_c6` into your Home Assistant `config/custom_components/` directory and restart HA.
+
+## `esp32_arduino`
+Arduino sketch for the ESP32-C6-EVB board.
+
+- Hosts a REST API on port 80
+- Registers a callback URL with HA on startup
+- POSTs input state changes to HA webhook in real time
+
+### Arduino IDE Settings
+| Setting | Value |
+|---|---|
+| Board | ESP32C6 Dev Module |
+| Flash Size | 4MB |
+| USB CDC On Boot | Enabled |
+
+See [`esp32_arduino/DEPLOYMENT_GUIDE.md`](esp32_arduino/DEPLOYMENT_GUIDE.md) for full flashing instructions.