This shield along does not have the Arduino stackable header and screw terminals (3.5mm pitch). To make the procurement job easy, you could get the Ardumoto Shield Kit instead
https://www.sparkfun.com/products/13201
Update on 10/11/2017: Sparkfun just came out with a new Ardumoto shield (
DEV-14129) to replace the old one used in this project (
DEV-09815). The difference between those two versions are:
a) The pin assignments are different. The new one uses pin 2 and pin 4 to control the rotation direction, while the old one uses pin 12 and 13
b) The new one added some LEDs with 1K ohm resistors on the IO pins directly to show signal activity. However, this will cause problems for the M10 board. Because the M10 board supports dual voltage IO (3.3V/5V), so the IO output for M10 boards are OD (open drain) instead of totem pole. And the 1K ohm resistor on the new shield will pull the voltage below its threshold. So to use the new shield for this project, those 1K ohm resistors have to be removed.
