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docs: add wiring

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README.md
··· 30 30 31 31 Nothing yet 32 32 33 + ## Pinout & Wiring Diagram 34 + 35 + ### XIAO RP2040 Connections 36 + 37 + | XIAO Pin | Connected To | Description | 38 + | --- | --- | --- | 39 + | D0/GPIO26/A0 | - | Unused | 40 + | D1/GPIO27/A1 | - | Unused | 41 + | D2/GPIO28/A2 | - | Unused | 42 + | D3/GPIO29/A3 | - | Unused | 43 + | D4/GPIO6/SDA | LIS3DHTR SDA | I2C Data Line | 44 + | D5/GPIO7/SCL | LIS3DHTR SCL | I2C Clock Line | 45 + | D6/GPIO0/TX | - | Unused | 46 + | D7/GPIO1/RX | NEOPIXEL_SIG | LED Data In | 47 + | D8/GPIO2/SCK | - | Unused | 48 + | D9/GPIO4/MISO | - | Unused | 49 + | D10/GPIO3/MOSI | - | Unused | 50 + | 3V3 | LIS3DHTR VDD_IO | 3.3V Power | 51 + | GND | LIS3DHTR GND, LEDs GND | Ground | 52 + | 5V | LEDs VDD | 5V Power | 53 + 54 + ### LIS3DHTR Accelerometer 55 + 56 + | LIS3DHTR Pin | Connected To | Description | 57 + | --- | --- | --- | 58 + | VDD | 3.3V | Power Supply | 59 + | VDD_IO | 3.3V | Interface Power | 60 + | GND | GND | Ground | 61 + | SDA | XIAO D4 | I2C Data | 62 + | SCL | XIAO D5 | I2C Clock | 63 + | INT1 | - | Interrupt (not used) | 64 + | INT2 | - | Interrupt (not used) | 65 + 66 + ### Wiring Diagram 67 + 68 + ```mermaid 69 + graph TD 70 + XIAO[XIAO RP2040] -- SDA --> LIS3D[LIS3DHTR Accelerometer] 71 + XIAO -- SCL --> LIS3D 72 + XIAO -- 3.3V --> LIS3D 73 + XIAO -- GND --> LIS3D 74 + 75 + XIAO -- 5V --> LEDS[SK6812 LED Grid] 76 + XIAO -- GND --> LEDS 77 + XIAO -- D7/GPIO1 --> LEDS 78 + 79 + LEDS -- Data chain --> LED1[LED #1] 80 + LED1 --> LED2[LED #2] 81 + LED2 --> LED3[LED #3] 82 + LED3 --> DOT["..."] 83 + DOT --> LED64[LED #64] 84 + 85 + classDef mcu fill:#f96,stroke:#333,stroke-width:2px; 86 + classDef sensor fill:#bbf,stroke:#33f,stroke-width:1px; 87 + classDef led fill:#9f9,stroke:#3a3,stroke-width:1px; 88 + 89 + class XIAO mcu; 90 + class LIS3D sensor; 91 + class LEDS,LED1,LED2,LED3,LED64 led; 92 + ``` 93 + 94 + ### Capacitor Placement 95 + 96 + - 100nF ceramic capacitor between VDD and GND of LIS3DHTR 97 + - 10nF ceramic capacitors for each SK6812 LED (placed close to power pins) 98 + 33 99 <p align="center"> 34 100 <img src="https://raw.githubusercontent.com/taciturnaxolotl/carriage/master/.github/images/line-break.svg" /> 35 101 </p>