update: improve documentation and restructure code for modular hardware integration, add CAN communication to HAL, and update KiCad layouts

website/content/Hardware/_index.md

@@ -11,18 +11,35 @@ tags: ["esp32", "hardware"]
   <img src="pcb_back.png" class="grid-w50" />
 {{< /gallery >}}
 
+<!-- TODO: Add new screenshots of the modular PCB setup -->
+
 {{< gitea server="https://git.mannheim.ccc.de/" repo="C3MA/PlantCtrl" >}}
 
-## ESP32-C6
-* RiscV
-* Fully done in Kicad (#schematics here link)
-* Supports 16 Moisture Sensors (two per plant)
-* Support for 8 Pumps/Valves
-* Support for main Pump/Valve
-* All Pump/Valve outputs are 7-24V based on supplied Voltage
-* Use of efficient DC-DC Converters for 3.3V and for Led-Nightlight
-* Embedded Solar MPPT Charger
-* Can also be used with a power supply
+## Modular Design
+The PlantCtrl hardware has been redesigned from a single large PCB into a more flexible, modular system. This allows users to only build or use the components they actually need for their specific setup.
+
+The system now consists of a **MainBoard** which acts as the controller and several pluggable or connectable modules.
+
+## MainBoard (ESP32-C6)
+* **Processor:** ESP32-C6 (RiscV)
+* **Connectivity:** WiFi, Bluetooth, Zigbee/Thread support
+* **Form Factor:** Compact main board with headers for modules
+* **Fully Open Source:** Designed in KiCad
+
+## Available Modules
+* **MPPT Charger:** Efficient solar charging for batteries.
+* **Pump Driver:** High-current outputs for pumps and valves.
+* **Sensor Interface:** Support for multiple moisture sensors.
+* **Light Controller:** For LED nightlights or growth lights.
+
+## Capabilities
+* **Moisture Sensors:** Supports multiple capacitive or resistive sensors via expansion modules.
+* **Pumps/Valves:** Support for multiple independent watering zones.
+* **Power:** 
+    * Solar powered with MPPT
+    * Battery powered with optional Battery Management (Fuel Gauge)
+    * Can also be used with a standard power supply (7-24V)
+* **Efficient Power:** Use of high-efficiency DC-DC converters for 3.3V and peripherals.
 
 ## Made with:
 <a href="https://www.kicad.org/">