### Read VEML7700 Ambient Light Sensor via I²C

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/usage-guide.md

Demonstrates reading ambient light data from the VEML7700 sensor using the Wire library.

```c
// Pseudo-code for typical usage
#include <Wire.h>

#define VEML7700_ADDR 0x10

void setup() {
  Wire.begin();
}

void loop() {
  // Read ambient light
  Wire.beginTransmission(VEML7700_ADDR);
  Wire.write(0x04);  // ALS register
  Wire.endTransmission();
  
  Wire.requestFrom(VEML7700_ADDR, 2);
  uint16_t lux = (Wire.read() << 8) | Wire.read();
  
  // lux now contains light sensor reading
}
```

--------------------------------

### Define Library Metadata in library.lp

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/library-structure.md

Use this structure to define the core metadata for a LibrePCB library, including UUID, name, and versioning.

```lisp
(librepcb_library <UUID>
 (name "Display Name")
 (description "Description")
 (keywords "tag1,tag2")
 (author "Author Name")
 (version "X.Y.Z")
 (created TIMESTAMP)
 (deprecated false)
 (url "Repository URL")
 (dependency <UUID>)
 (manufacturer "Manufacturer")
)
```

--------------------------------

### View Library File Structure

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/index.md

Displays the directory layout of the Adafruit library workspace.

```text
/workspace/home/output/
├── index.md                          ← This file
├── api-reference-devices.md          ← Device definitions
├── api-reference-components.md       ← Component definitions
├── api-reference-packages.md         ← Physical packages
├── signals-and-pins.md               ← Signal mappings
├── library-structure.md              ← Format & structure
└── usage-guide.md                    ← Integration guide
```

--------------------------------

### Define Device in device.lp

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/library-structure.md

Links a component to a package and defines pad mappings and manufacturer part numbers.

```lisp
(librepcb_device <UUID>
 (name "Device Name")
 (description "Description")
 (component <COMPONENT_UUID>)
 (package <PACKAGE_UUID>)
 (pad <UUID> (optional false) (signal <SIGNAL_UUID>))
 (part "MPN" (manufacturer "Mfg"))
)
```

--------------------------------

### Library File Structure

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/README.md

Visual representation of the library directory layout and key documentation files.

```text
/workspace/home/output/
├── README.md                          ← This file
├── index.md                           ← Start here
│
├── api-reference-devices.md           ← Device specs
├── api-reference-components.md        ← Component specs
├── api-reference-packages.md          ← Package specs
├── signals-and-pins.md                ← Signal mappings
│
├── library-structure.md               ← Format & structure
├── usage-guide.md                     ← Integration guide
└── complete-reference.md              ← All UUIDs & paths
```

--------------------------------

### Retrieve Library Metadata

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/complete-reference.md

Displays the core library identification and configuration details from library.lp.

```text
Library UUID:         0120d71f-d2f7-4e52-8a11-80ada981ad5f
Name:                 Adafruit
Version:              0.2.1
Author:               LibrePCB
Manufacturer:         Adafruit
License:              CC0-1.0 (Creative Commons Public Domain)
Created:              2019-06-13T08:43:28Z
Repository:           https://github.com/LibrePCB-Libraries/Adafruit.lplib
Deprecated:           false
Description:          Adafruit products (unofficial)
Keywords:             adafruit
```

--------------------------------

### Define Package in package.lp

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/library-structure.md

Specifies physical package details including assembly type, grid interval, pads, and footprints.

```lisp
(librepcb_package <UUID>
 (name "PACKAGE_NAME")
 (description "Description")
 (assembly_type tht)
 (grid_interval 2.54)
 (pad <UUID> (name "PadName"))
 (footprint <UUID> (name "Variant"))
)
```

--------------------------------

### Define Component in component.lp

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/library-structure.md

Defines a component's properties, signals, and variants within the LibrePCB library structure.

```lisp
(librepcb_component <UUID>
 (name "Component Name")
 (description "Description")
 (keywords "tags")
 (author "Author")
 (version "X.Y.Z")
 (created TIMESTAMP)
 (deprecated false)
 (category <UUID>)
 (schematic_only false)
 (prefix "U")
 (signal <UUID> (name "SignalName") (role passive) ...)
 (variant <UUID> (name "default") ...)
)
```

--------------------------------

### VEML7700 Light Sensor Integration

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/README.md

Displays the I2C master connection pattern and power requirements for the VEML7700 breakout board.

```text
Microcontroller (I²C Master)
    ↓
[VEML7700 Breakout]
    ├─ Fixed I²C Address: 0x10
    ├─ Power: 3.0V-5.0V
    ├─ Signals: GND, Vin, SCL, SDA
    └─ Output: 3Vo (3.3V option)
```

--------------------------------

### SWD Debug Header Layout

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/README.md

Defines the standard pinout for an ARM Cortex-M 10-pin 1.27mm Serial Wire Debug connector.

```text
Programmer (ST-Link, J-Link, etc.)
    ↓
[SWD Header 10-pin 1.27mm]
    ├─ VDD: Target power
    ├─ SWCLK: Debug clock
    ├─ SWDIO: Debug data
    └─ GND: Ground
```

--------------------------------

### Device and Component UUID Reference

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/README.md

Table mapping specific Adafruit devices and components to their unique LibrePCB identifiers.

```markdown
| Device | UUID |
|--------|------|
| VEML7700 (Device) | `e6b31596-3f12-465b-bc58-96c49b91aa9c` |
| TCA9548A (Device) | `2c67e4d5-e2b1-4d65-8676-bbd15665b5bd` |
| SWD Header (Device) | `7f909383-6ffb-48ce-b340-e60d31396a2f` |
| VEML7700 (Component) | `107d2abc-3ca9-4a57-b7f6-a7f3dd6cf1f8` |
| TCA9548A (Component) | `bb589773-ddb6-421c-b08e-f15bd92eb5c9` |
| Library | `0120d71f-d2f7-4e52-8a11-80ada981ad5f` |
```

--------------------------------

### TCA9548A Multiplexer Configuration

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/README.md

Illustrates the I2C multiplexing pattern for managing multiple devices with identical addresses.

```text
I²C Master
    ↓
[TCA9548A]
    ├─ Address: 0x70-0x77 (configurable via A0, A1, A2)
    └─ Channels: 8 independent I²C buses (SC0-SC7, SD0-SD7)
        ├─ Device with Address 0x50 on Channel 0
        ├─ Device with Address 0x50 on Channel 1
        └─ ... up to 8 devices
```

--------------------------------

### Select TCA9548A I²C Multiplexer Channel

Source: https://github.com/librepcb-libraries/adafruit.lplib/blob/master/_autodocs/usage-guide.md

Provides a function to switch active I²C channels on a TCA9548A multiplexer.

```c
// Pseudo-code for channel selection
#include <Wire.h>

#define TCA9548A_ADDR 0x70  // Assuming A0=A1=A2=GND

void selectChannel(uint8_t channel) {
  Wire.beginTransmission(TCA9548A_ADDR);
  Wire.write(1 << channel);  // Set channel bit
  Wire.endTransmission();
}

void setup() {
  Wire.begin();
}

void loop() {
  // Read from sensor on channel 0
  selectChannel(0);
  
  // I²C commands here reach only channel 0
  // (other devices not accessible)
  
  // Switch to channel 1
  selectChannel(1);
  
  // I²C commands here reach only channel 1
}
```

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