We just finished revising our shield-shield design. I’m attaching the Eagle schematic and PCB layout files for you folks to take a look and review. Tell us what you think.
Here is a summary:
- Logic level translator on all digital I/O pins. Analog pins are directly connected and are only limited to a max of 3.3V input.
- On board 5V power regulator with a safe input voltages from 7V - 12V DC
- Reverse polarity protection diode