Cybertrist · Sep 22, 2026 · Sep 22, 2026
diff --git a/README.en.md b/README.en.md
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+<div align="center">
+
+<p>
+  <a href="README.md"><img src="docs/langues/fr-off.png" alt="Lire cette page en français" width="150" /></a>
+  <img src="docs/langues/en-on.png" alt="English, page shown" width="150" />
+</p>
+
+<img src="docs/en/banniere.png" alt="LED bench, the test version of the Switch Track" width="100%">
+
+</div>
+
+A test bench for the Switch Track module, with no mechanical parts. Two LEDs stand in for the actuator: one lights up for the left position, the other for the right. Everything else is identical to the real module, captive portal, authentication and WebSocket link included.
+
+It is there to prove out the whole chain between the server and a module before an actuator is ever wired in. If the LEDs change at the right moment, the problem is not in the network.
+
+<img src="docs/en/sections/s01.png" alt="01 Why a bench" width="100%">
+
+Debugging a WebSocket link with an actuator attached means stacking two sources of failure. An order that never arrives and an actuator that will not move produce exactly the same symptom.
+
+This repository isolates the software half. You check that authentication goes through, that commands arrive, that replies go back, and that reconnection works after a drop. Only then do you wire in the mechanics.
+
+The code is the Switch Track with the motor driving removed, roughly sixty lines fewer.
+
+<img src="docs/en/sections/s02.png" alt="02 Hardware" width="100%">
+
+<img src="docs/en/schemas/brochage.png" alt="GPIO 2 carries the left LED, which shows what the actuator would do to the left. GPIO 4 carries the right LED, which shows what the actuator would do to the right." width="100%">
+
+One current-limiting resistor per LED, nothing else. An ESP32 DevKit and a breadboard are enough. These are the same pins as on the real module, where they signal the position while the actuator works on GPIO 21 and 22.
+
+<img src="docs/en/sections/s03.png" alt="03 Commands" width="100%">
+
+The same as the real module, since that is the whole point.
+
+<img src="docs/en/schemas/commandes.png" alt="switch_left lights the left LED, as if the actuator had thrown the track over. switch_right lights the right LED, as if the actuator had handed the track back. get_position returns the simulated position without touching the LEDs." width="100%">
+
+<img src="docs/en/sections/s04.png" alt="04 Bringing it up" width="100%">
+
+First copy [`include/env.h.example`](include/env.h.example) to `include/env.h` and fill it in: fallback portal credentials, the module identity and its secret. That file is not in git, and without it the firmware does not compile.
+
+Requires [PlatformIO](https://platformio.org/) inside Visual Studio Code.
+
+```bash
+pio run                  # build
+pio run -t upload        # upload the firmware
+pio run -t uploadfs      # upload the portal to LittleFS
+pio device monitor       # serial console, 115200 baud
+```
+
+1. Power the module. It creates a WiFi access point.
+2. Connect to it and open `http://192.168.4.1`.
+3. Enter the target network.
+4. The module reboots, joins the network and announces itself to the server.
+
+The serial console at 115200 baud traces every step: WiFi connection, WebSocket opening, authentication, then each command received. That is where you read what is going wrong.
+
+<img src="docs/en/sections/s05.png" alt="05 Ecosystem" width="100%">
+
+```ini
+links2004/WebSockets        ; link to the controller
+bblanchon/ArduinoJson       ; the messages exchanged
+ayresnet/AyresWiFiManager   ; captive portal and reconnection
+```
+
+Embedded filesystem: **LittleFS**. The module this bench is the test version of is the [Switch Track](https://github.com/Microcoaster/Switch-Track), and the common base is the [WiFi Manager](https://github.com/Microcoaster/MicroCoaster_WifiManager).
+
+---
+
+<sub>MicroCoaster · Author: Cybertrist</sub>
diff --git a/README.md b/README.md
@@ -1,5 +1,10 @@
 <div align="center">
 
+<p>
+  <img src="docs/langues/fr-on.png" alt="Français, page affichée" width="150" />
+  <a href="README.en.md"><img src="docs/langues/en-off.png" alt="Read this page in English" width="150" /></a>
+</p>
+
 <img src="docs/banniere.png" alt="Banc LED, version d'essai du Switch Track" width="100%">
 
 </div>

diff --git a/docs/en/banniere.png b/docs/en/banniere.png
diff --git a/docs/en/schemas/brochage.png b/docs/en/schemas/brochage.png
diff --git a/docs/en/schemas/commandes.png b/docs/en/schemas/commandes.png
diff --git a/docs/en/sections/s01.png b/docs/en/sections/s01.png
diff --git a/docs/en/sections/s02.png b/docs/en/sections/s02.png
diff --git a/docs/en/sections/s03.png b/docs/en/sections/s03.png
diff --git a/docs/en/sections/s04.png b/docs/en/sections/s04.png
diff --git a/docs/en/sections/s05.png b/docs/en/sections/s05.png
diff --git a/docs/langues/en-off.png b/docs/langues/en-off.png
diff --git a/docs/langues/en-on.png b/docs/langues/en-on.png
diff --git a/docs/langues/fr-off.png b/docs/langues/fr-off.png
diff --git a/docs/langues/fr-on.png b/docs/langues/fr-on.png