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Single power source info

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Dejvino 2026-02-21 22:38:15 +01:00
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README.md
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@ -22,6 +22,14 @@ The project is best powered in two parts:
1. **Raspberry Pi Pico W**: Power the Pico via its Micro-USB port from a computer or a USB wall adapter.
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.
### Single 5V Supply with Diode
You can power the Pico from the same external 5V source used for the NeoPixels by connecting a diode (e.g., 1N4001 silicon or 1N5817 Schottky).
* **Anode (+)**: Connect to External 5V Supply (+).
* **Cathode (-/Striped)**: Connect to **VSYS (Pin 39)** on the Pico.
This drops the voltage (to ~4.3V with silicon, ~4.7V with Schottky) which is safe for the Pico, and prevents power back-feeding into your computer's USB port if both are connected.
> **WARNING**: Do NOT power the NeoPixel matrix from the Pico's 3.3V or VBUS pins. VBUS is connected directly to the USB port, which is typically limited to 500mA. The matrix can draw over 2A, which could overload and damage your host computer's USB port.
### Component Wiring