dunkirk.sh
a cool™ board of neopixels
docs: add wiring
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README.md
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README.md
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## Pinout & Wiring Diagram
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### XIAO RP2040 Connections
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| XIAO Pin | Connected To | Description |
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| --- | --- | --- |
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| D0/GPIO26/A0 | - | Unused |
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| D1/GPIO27/A1 | - | Unused |
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| D2/GPIO28/A2 | - | Unused |
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| D3/GPIO29/A3 | - | Unused |
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| D4/GPIO6/SDA | LIS3DHTR SDA | I2C Data Line |
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| D5/GPIO7/SCL | LIS3DHTR SCL | I2C Clock Line |
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| D6/GPIO0/TX | - | Unused |
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| D7/GPIO1/RX | NEOPIXEL_SIG | LED Data In |
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| D8/GPIO2/SCK | - | Unused |
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| D9/GPIO4/MISO | - | Unused |
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| D10/GPIO3/MOSI | - | Unused |
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| 3V3 | LIS3DHTR VDD_IO | 3.3V Power |
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| GND | LIS3DHTR GND, LEDs GND | Ground |
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| 5V | LEDs VDD | 5V Power |
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### LIS3DHTR Accelerometer
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| LIS3DHTR Pin | Connected To | Description |
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| --- | --- | --- |
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| VDD | 3.3V | Power Supply |
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| VDD_IO | 3.3V | Interface Power |
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| GND | GND | Ground |
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| SDA | XIAO D4 | I2C Data |
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| SCL | XIAO D5 | I2C Clock |
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| INT1 | - | Interrupt (not used) |
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| INT2 | - | Interrupt (not used) |
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### Wiring Diagram
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```mermaid
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graph TD
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XIAO[XIAO RP2040] -- SDA --> LIS3D[LIS3DHTR Accelerometer]
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XIAO -- SCL --> LIS3D
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XIAO -- 3.3V --> LIS3D
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XIAO -- GND --> LIS3D
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XIAO -- 5V --> LEDS[SK6812 LED Grid]
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XIAO -- GND --> LEDS
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XIAO -- D7/GPIO1 --> LEDS
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LEDS -- Data chain --> LED1[LED #1]
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LED1 --> LED2[LED #2]
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LED2 --> LED3[LED #3]
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LED3 --> DOT["..."]
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DOT --> LED64[LED #64]
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classDef mcu fill:#f96,stroke:#333,stroke-width:2px;
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classDef sensor fill:#bbf,stroke:#33f,stroke-width:1px;
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classDef led fill:#9f9,stroke:#3a3,stroke-width:1px;
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class XIAO mcu;
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class LIS3D sensor;
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class LEDS,LED1,LED2,LED3,LED64 led;
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```
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### Capacitor Placement
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- 100nF ceramic capacitor between VDD and GND of LIS3DHTR
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- 10nF ceramic capacitors for each SK6812 LED (placed close to power pins)
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<p align="center">
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<img src="https://raw.githubusercontent.com/taciturnaxolotl/carriage/master/.github/images/line-break.svg" />
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</p>