Alvaro

Pro Micro-compatible 32u4 Breakout Board

Disclaimer

This board is a heavily-modified Goldfish Rev. C. While the schematic, basic layout, pinout (of course) etc is essentially the same, it uses 0603 components instead of 0402 and has some other changes.

Key Features

• Mid-mount USB-C connector using a low-profile USB C 2.0 connector.
• Pin-compatible with the original Pro Micro.
• 5 extra pins on the bottom like the Elite-C and Goldfish.
• Exposed USB data lines on 2.54mm grid.
• Easier to solder than the Goldfish.
• Has fuse unlike Goldfish.
• On-board power LED.
• Fully hand-solderable.

Changelog

• 27/09/2020: Initial commit.
• 29/09/2020: Switched D1 size from SOD323 to SOD123.
• 13/10/2020: Updated to V1.1. Added F1 1206 500mA polyfuse.
• 17/10/2020: Updated to V1.2. Moved location of parts closer to center.
• 31/10/2020: Updated to V1.3. Added 0603 power indicator LED, changed R6 from 10k to 1k LED resistor.
• 29/11/2020: Updated to V1.4. Increased size of 3225 crystal pads, changed USB C THT holes back to single oval shape, added THT pad under 32u4 to allow for the entire thing to be hand-soldered easier.
• 3/12/2020: Updated to V1.5. Decreased size of 3225 crystal pads again and changed them to THT. Staggered components to allow for easier soldering.