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People have asked about the code in my short video showing an Arduino running two stepper motors and one servo simultaneously. Please look at the bottom of the page for a zip archive of the code/sketch.
Notes: Each stepper motor needs some sort of driver board or h-bridge chip. Examples are the ULN2003 (Darlington pairs) or the :L293D half-H driver chip. You'll also need to power them with a separate power supply (with the GROUND connected to the Arduino GROUND). The "hobby servo", however, can be powered from the Arduino - I suspect if you use more than one servo, you might need to put THEM on a separate power supply as well.
This code uses the excellent AccelStepper library, which has some advantages over the stock stepper support in the Arduino IDE -- namely, it doesn't have blocking code. You will, however, have to call the stepper object's .run() method once per loop() so that the library can update the position, velocity, etc.
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