I’ve been kind of busy and distracted lately, so I haven’t had much time to get any embedded microcontrollers. I did dust off an Arduino FIO that I never played with, and charged up a 1000maH LiPo battery to power it. While it was blinking, I dug out my Xbees and started thinking of a project that I put off a while ago (more details later) and realized that while the Arduino FIO is cheap, compact, and includes an Xbee socket, it does have one kind of annoying problem: no mounting holes. While pondering this, I decided to try to dig out the dimensions for the standard hole pattern used on the Arduino. Like many things regarding the Arduino, the answer could be found on the Adafruit weblog:

Arduino Hole Dimensions Drawing from adafruit industries blog.