Update docs and firmware for ESPHome bridge migration

- Replace gauge.py (MicroPython) references with gaugecontroller.yaml (ESPHome)
- Update CLAUDE.md and README.md to document ESPHome-native API integration
- Update LED wiring docs for separate main/indicator strips (D22/D36)
- Refactor Arduino firmware to drive two WS2812 strips independently
- Add per-gauge physical offset caching for main and indicator LEDs
- Frame-limit breathe effect (16ms) to reduce unnecessary strip refreshes

README.md

@@ -7,7 +7,7 @@ A dedicated gauge controller for Arduinos.
 This repository contains:
 
 - `Gaugecontroller/Gaugecontroller.ino`: the Arduino Mega firmware for the stepper gauges, LEDs, and integrated HV5812-based VFD
-- `gauge.py`: the ESP32 / MicroPython MQTT bridge that exposes the controller to Home Assistant
+- `gaugecontroller.yaml`: the ESPHome-based ESP32 firmware that exposes the gauges and VFD to Home Assistant via the native API
 
 ## VFD Support
 
@@ -48,16 +48,19 @@ Rules:
 - shorter values are right-aligned
 - leading zeroes are preserved if they are part of the input
 
-## Home Assistant Entities
+## Home Assistant Integration
 
-The MQTT bridge publishes Home Assistant discovery entities for the VFD:
+The ESPHome firmware in `gaugecontroller.yaml` exposes entities to Home Assistant via the native API:
 
-- `VFD Display`
-  text entity for the displayed value
-- `VFD Decimal Point`
-  switch entity
-- `VFD Alarm`
-  switch entity
+### Gauge Controls
+- Number entities for each gauge's target value (with unit conversion)
+- Number entities for speed and acceleration (diagnostic)
+- Rezero buttons for each gauge and all gauges
+
+### VFD Display
+- `VFD Display`: text entity for the displayed value
+- `VFD Decimal Point`: switch entity
+- `VFD Alarm`: switch entity
 
 The display is intentionally exposed as a text entity rather than a numeric entity so that:
 
@@ -65,27 +68,12 @@ The display is intentionally exposed as a text entity rather than a numeric enti
 - hexadecimal values like `DEAD` or `BEEF` work
 - clearing the display is possible with an empty value
 
-## MQTT Topics
+### LED Controls
+- RGB light entity for each gauge's backlight with effects (Blink, Breathe, Double Flash)
+- Binary light entities for each gauge's red/green indicators and status lights
 
-Using the configured `mqtt_prefix` from `config.json`, the VFD topics are:
-
-- `<prefix>/vfd/set`
-- `<prefix>/vfd/state`
-- `<prefix>/vfd/decimal_point/set`
-- `<prefix>/vfd/decimal_point/state`
-- `<prefix>/vfd/alarm/set`
-- `<prefix>/vfd/alarm/state`
-
-Example with the default prefix `gauges`:
-
-- `gauges/vfd/set`
-- `gauges/vfd/decimal_point/set`
-- `gauges/vfd/alarm/set`
-
-Example payloads:
-
-- publish `0123` to `gauges/vfd/set`
-- publish `ON` to `gauges/vfd/decimal_point/set`
-- publish `OFF` to `gauges/vfd/alarm/set`
-
-The MQTT bridge then converts that into the correct Arduino serial command such as `VFD 0123.`.
+### Diagnostics
+- WiFi signal sensor
+- Uptime sensor
+- IP address and SSID text sensors
+- Arduino Last Message sensor