docs: Expand README for vl53l1x driver.

lib/vl53l1x/README.md

@@ -1,9 +1,86 @@
-# MicroPython Driver for the vl53l1x ToF sensor
+# VL53L1X MicroPython Driver
 
-This library is a port of the [MicroPython driver for the vl53l1x ToF sensor](https://github.com/drakxtwo/vl53l1x_pico).
+MicroPython driver for the **VL53L1X Time-of-Flight (ToF) distance sensor**.
 
-The examples could be easily tested with [mpremote](https://docs.micropython.org/en/latest/reference/mpremote.html) with the following command :
+This library is a port of [vl53l1x_pico](https://github.com/drakxtwo/vl53l1x_pico).
 
-```sh
- mpremote mount . run examples/distance.py
+## Supported Sensor
+
+| Feature              | Value                |
+| -------------------- | -------------------- |
+| Technology           | Time-of-Flight (ToF) |
+| Range                | Up to ~4 meters      |
+| Accuracy             | ± 3% (typical)       |
+| Field of View        | 27°                  |
+| Interface            | I²C                  |
+| Default I²C address  | `0x29`               |
+| Device ID            | `0xEACC`             |
+
+## Features
+
+* Time-of-Flight distance measurement in millimeters
+* Model ID verification on initialization
+* Start / stop ranging control
+* Data-ready polling
+* Power management (on/off, reset)
+* Continuous measurement support
+
+## Basic Usage
+
+```python
+from machine import I2C
+from vl53l1x import VL53L1X
+
+i2c = I2C(1)
+tof = VL53L1X(i2c)
+
+distance = tof.read()
+print("Distance:", distance, "mm")
+```
+
+## API Reference
+
+### Initialization
+
+```python
+tof = VL53L1X(i2c, address=0x29)
+```
+
+The constructor checks the device ID (`0xEACC`) and raises `OSError` if the sensor is not detected.
+
+### Measurement
+
+* `distance_mm()` — read distance in millimeters (triggers ranging if needed)
+* `read()` — alias for `distance_mm()`
+
+### Ranging Control
+
+* `start_ranging()` — start continuous ranging
+* `stop_ranging()` — stop ranging
+* `data_ready()` — check if new data is available
+
+### Device Control
+
+* `device_id()` — read sensor model ID (returns `0xEACC`)
+* `reset()` — hardware reset via SOFT_RESET register (takes ~100 ms)
+
+### Power Management
+
+* `power_on()` — power up sensor
+* `power_off()` — power down sensor
+
+## Examples
+
+| File          | Description                         |
+| ------------- | ----------------------------------- |
+| `distance.py` | Continuous distance measurement loop |
+
+```bash
+mpremote mount lib/vl53l1x run lib/vl53l1x/examples/distance.py
 ```
+
+## Notes
+
+* The sensor requires initialization time after power-on (~200 ms).
+* The driver automatically waits for data readiness before returning a measurement.
+* Distance measurements are returned in millimeters.