It’s still hovering around freezing, so I guess it’s time for another Arduino.
I got the board down to the width of the original Arduino Pro Mini: 0.6″. I wasn’t able to shrink the length any; it’s still 1.8″. It doesn’t have an on-board power supply, there are no LEDs, and no optional pullups for I2C/Wire. Totally minimal, baby. You can see for yourself in the schematic.*
As with yesterday’s offering, a PCB is available through OSH Park.
*Subject to change!