40 lines
1.7 KiB
Markdown
40 lines
1.7 KiB
Markdown
# RP2040 MIDI Tracker
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A simple MIDI step sequencer using a Raspberry Pi Pico, an OLED display, a rotary encoder, and an 8x8 NeoPixel matrix.
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## Connections & Wiring
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Properly wiring the components is crucial, especially for power.
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### Power
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The project is best powered in two parts:
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1. **Raspberry Pi Pico**: Power the Pico via its Micro-USB port from a computer or a USB wall adapter.
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2. **NeoPixel 8x8 Matrix**: This component is power-hungry and **requires a separate, external 5V power supply**. A power supply capable of delivering at least 2A is recommended.
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> **WARNING**: Do NOT power the NeoPixel matrix from the Pico's 3.3V or VBUS pins. Doing so can draw too much current and damage your Pico and/or the host computer's USB port.
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### Component Wiring
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Make sure to establish a **common ground** by connecting the ground from your external 5V power supply to one of the GND pins on the Pico.
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| Component | Pico Pin | Description |
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| :--- | :--- | :--- |
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| **SSD1306 OLED** | | |
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| VCC | 3V3 (OUT) (Pin 36) | 3.3V Power |
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| GND | GND (Pin 38) | Ground |
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| SDA | GP4 (Pin 6) | I2C Data |
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| SCL | GP5 (Pin 7) | I2C Clock |
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| **Rotary Encoder** | | |
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| + (VCC) | 3V3 (OUT) (Pin 36) | 3.3V Power |
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| GND | GND (Pin 33) | Ground |
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| CLK | GP12 (Pin 16) | Encoder Clock |
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| DT | GP13 (Pin 17) | Encoder Data |
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| SW | GP14 (Pin 19) | Encoder Switch |
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| **WS2812B 8x8 Matrix**| | |
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| DIN (Data In) | GP16 (Pin 21) | NeoPixel Data |
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| 5V / VCC | External 5V Supply `+` | **External 5V Power** |
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| GND | External 5V Supply `-` | **External Power Ground** |
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| | GND (Pin 18) | **Common Ground with Pico** |
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Once everything is wired up, you can upload the code and your tracker should be ready to go! |