Document ESP32-S3 dashboard architecture

docs/wiring.md

@@ -635,3 +635,23 @@ UART wiring:
     ESP32 GND       -> Pico GND
 
 Do not use the ESP32 6-pin UART header for the dashboard UART. It appears to be connected to RXD/TXD for UART0/programming/debug.
+
+
+
+## Dashboard Wiring (Current Direction)
+
+Dashboard Hardware:
+- Waveshare 5" ESP32-S3 Display
+
+Communications:
+- WiFi connection to cargo ESP32 AP
+- HTTP API polling
+- No UART required for normal operation
+
+CAT5e Usage:
+- 12V power from cargo area to dashboard
+- Local buck converter in dashboard enclosure
+- Common ground
+
+Optional Future:
+- UART over CAT5e for diagnostics or alternate dashboard hardware