Stupid beginner question: controlling motors with an arduino.

How would one go about using the 5v IO output of the arduino to control a motor, which is probably 12v or 24v, obviously much more power than the arduino can supply directly, even to a single motor? I know that you can use the 5v output to open and close a relay to turn the 12 or 24 volt power on and off, but I want to be able to use the 5v PWM to control the motor speed at any moment, not just an all-or-nothing on/off switch with a fixed set speed.

Touch here for the full post on the Arduino Apprentices tumblr

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