diff --git a/README.md b/README.md
index c76e293..96c5414 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,12 @@ MQTT-based gauge controller for ESP32 / MicroPython. Drives a VID28/BKA30D/X25 s
 |------|-------------|
 | `boot.py` | WiFi connect + OTA trigger |
 | `ota.py` | Gitea API poller for OTA updates |
-| `gaugemqtt.py` | Main MQTT controller |
-| `gauge.py` | Stepper driver for VID28/BKA30D/X25 gauges |
-| `config.json` | Configuration (create from `config.example.json`) |
+| `ota_config.json` | OTA config (create from `ota_config.example.json`) |
+| `ota_config.example.json` | OTA config template |
+| `gaugemqttcontinuous.py` | Main MQTT controller |
+| `gauge_vid6008.py` | Stepper driver for VID28/BKA30D/X25 gauges |
+| `main.py` | Entry point, calls `ota.mark_ok()` on success |
+| `config.json` | Application config (create from `config.example.json`) |
 | `config.example.json` | Template with all options |
 
 ## Deployment
@@ -19,10 +22,11 @@ MQTT-based gauge controller for ESP32 / MicroPython. Drives a VID28/BKA30D/X25 s
 # First time: upload via USB
 ampy --port /dev/ttyUSB0 put boot.py
 ampy --port /dev/ttyUSB0 put ota.py
-ampy --port /dev/ttyUSB0 put gaugemqtt.py
-ampy --port /dev/ttyUSB0 put gauge.py
+ampy --port /dev/ttyUSB0 put ota_config.json
+ampy --port /dev/ttyUSB0 put main.py
+ampy --port /dev/ttyUSB0 put gaugemqttcontinuous.py
+ampy --port /dev/ttyUSB0 put gauge_vid6008.py
 ampy --port /dev/ttyUSB0 put config.json
-ampy --port /dev/ttyUSB0 put lib/gauge.py /lib/gauge.py
 
 # Monitor serial output
 minicom -D /dev/ttyUSB0 -b 115200
@@ -39,19 +43,19 @@ All topics are prefixed with `mqtt_prefix`:
 | `/status` | → | `online`/`offline` |
 | `/zero` | ← | Trigger zero calibration |
 | `/led/red/set` | ← | `ON`/`OFF` |
+| `/led/red/state` | → | `ON`/`OFF` |
 | `/led/green/set` | ← | `ON`/`OFF` |
-| `/led/backlight/set` | ← | Brightness 0-100 |
+| `/led/green/state` | → | `ON`/`OFF` |
+| `/led/backlight/set` | ← | `{"state": "ON"/"OFF", "color": {"r","g","b"}, "brightness": 0-255}` |
+| `/led/backlight/state` | → | Current backlight state |
 
 ## Configuration
 
-Copy `config.example.json` to `config.json` and edit:
+Copy `config.example.json` to `config.json` and `ota_config.example.json` to `ota_config.json` and edit:
 
 ### WiFi
 
-| Key | Default | Description |
-|-----|---------|-------------|
-| `wifi_ssid` | — | WiFi network name |
-| `wifi_password` | — | WiFi password |
+WiFi credentials are in `ota_config.json` (shared with OTA settings), not `config.json`.
 
 ### MQTT
 
@@ -68,7 +72,8 @@ Copy `config.example.json` to `config.json` and edit:
 
 | Key | Default | Description |
 |-----|---------|-------------|
-| `gauge_pins` | `[12, 13, 26, 27]` | GPIO pins (IN1, IN2, IN3, IN4) |
+| `gauge_pins` | `[12, 13]` | GPIO pins (`4phase`: IN1-4, `stepdir`: DIR, STEP) |
+| `gauge_mode` | `stepdir` | Driver mode: `stepdir` (DIR+STEP) or `4phase` (full-wave) |
 | `gauge_min` | 0 | Minimum value |
 | `gauge_max` | 7300 | Maximum value |
 | `gauge_pulse` | 4 | Pulse width in milliseconds |
@@ -77,13 +82,26 @@ Copy `config.example.json` to `config.json` and edit:
 | `idle_release_ms` | 3000 | Release coils after idle (ms) |
 | `rezero_interval_ms` | 3600000 | Auto-rezero interval (ms, default 1hr) |
 
+### OTA
+
+| Key | Default | Description |
+|-----|---------|-------------|
+| `gitea_base` | — | Gitea server URL (no trailing slash) |
+| `repo_owner` | — | Repository owner |
+| `repo_name` | — | Repository name |
+| `repo_folder` | — | Folder inside repo to sync |
+| `repo_branch` | `main` | Branch to track |
+| `api_token` | — | API token for private repos |
+| `wifi_ssid` | — | WiFi network name |
+| `wifi_password` | — | WiFi password |
+
 ### LEDs
 
 | Key | Default | Description |
 |-----|---------|-------------|
 | `led_red_pin` | 33 | Red LED GPIO pin |
 | `led_green_pin` | 32 | Green LED GPIO pin |
-| `led_bl_pin` | 23 | Backlight PWM GPIO pin |
+| `led_bl_pin` | 23 | RGB backlight (WS2812/NeoPixel) GPIO pin |
 
 ### Home Assistant Discovery
 
@@ -105,3 +123,23 @@ Copy `config.example.json` to `config.json` and edit:
 | Key | Default | Description |
 |-----|---------|-------------|
 | `heartbeat_ms` | 10000 | State publish interval (ms) |
+
+## OTA Updates
+
+On each boot, `boot.py` connects WiFi and runs `ota.update()`. The updater:
+
+1. If last boot was good and commit unchanged → skip file check entirely
+2. Otherwise, compares file SHA1 hashes with local manifest
+3. Downloads changed/missing files to `.tmp`, then renames into place
+4. On success, saves manifest with commit SHA; `main.py` writes OK flag
+
+### Manifest
+
+Create `ota_manifest.txt` in your repo root to specify which files to sync:
+
+```
+boot.py           # specific file
+main.py           # another file
+*.py              # wildcard (matches anywhere)
+selsyn/           # entire directory (trailing slash)
+```
diff --git a/config.example.json b/config.example.json
index 547e482..f2f1a8d 100644
--- a/config.example.json
+++ b/config.example.json
@@ -18,7 +18,7 @@
   "rezero_interval_ms": 3600000,
   "led_red_pin": 33,
   "led_green_pin": 32,
-  "led_bl_pin": 23,
+  "led_bl_pin": 3,
   "device_name": "Selsyn 1",
   "device_model": "Chernobyl Selsyn-inspired gauge",
   "device_manufacturer": "AdeBaumann",