How a devboard works (and how to make your own)
15 days ago
- #KiCad
- #PCB Design
- #RP2040
- Introduction to designing a devboard using the RP2040 SoC, highlighting its beginner-friendly nature and flexibility.
- Explanation of an SoC (System on Chip) and the RP2040's features including SRAM, processors, USB controllers, and multiple IOs.
- Guide on starting a new project in KiCad, emphasizing the importance of understanding schematics and PCB layouts.
- Detailed steps on adding the RP2040 to the schematic, including the significance of decoupling capacitors for power stability.
- Instructions on setting up USB-C connectivity, including wiring data lines, pull-down resistors, and voltage regulation from 5V to 3.3V.
- Explanation of the crystal oscillator's role in providing precise clock signals for USB and other peripherals.
- Guide on adding flash storage via quad SPI, including the setup of QSPI pins and entering BOOTSEL mode with a button.
- Steps for breaking out I/O headers according to the Raspberry Pi Pico pinout, including handling unused pins.
- Finalizing the schematic with organization tips, running ERC for error checking, and assigning footprints to components.
- PCB design process including component placement, routing differential pairs for USB, and using ground fills for signal integrity.
- Running DRC to resolve PCB errors, adding silkscreen art, and preparing fabrication files for manufacturing.
- Optional guide on hand-soldering components, including tools needed and techniques for soldering small SMD parts.