Showing posts with label protoshield. Show all posts
Showing posts with label protoshield. Show all posts

Thursday, April 8, 2010

Minimalduino v.89 Delivered

Three copies of my latest Minimalduino design (V .89) arrived today, fabricated in the DorkbotPDX circuit board order. I built one with all components and it works perfectly, with the exception of the 3.3V regulator having a different pinout than the 75LXX part I used in Eagle-- oops...

A SparkFun protoshield and Adafruit motor shield fit on top fine, but with very little (read: "zero") clearance over the tall capacitors I used-- they'll get some tape on top, and the next revision will use shorter caps or orient them sideways. Excited to work with my first factory-made board, I shot and posted some build pictures with a few notes.

To correct in the next revision:
  • Fix 3.3V regulator (MCP1700-330) pinout,
  • Lay out for wider/shorter or horizontal voltage regulator caps for better shield vertical clearance.
To add/improve in the next revision:
  • 5V/3.3V switchable with a jumper on three pins (though it will limit power),
  • Top pad and through holes under 7805 for better heat dissipation,
  • Credits (CC, author names) on bottom silk screen,
  • Optional resettable fuse?
  • Optional on/off switch or jumper pins?
  • Try to reduce the number and length of jumpers.