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Middleware
Jonathan the digital IO pins on the Arduino generally are rated at 40milliamps and heater straps between about .3 and 1.5 amps (or greater). The aruino works on 5volts, heater straps will typically be 12Volts. You will need some kind of switch in the middle and normally some resistors to protect the Arduino.
Have a browse at the material wasyoungonce and I have put up about the controllers we have built to look at idea's for output stages. There is also some good discussion around regarding considerations for the output stages (high side switching vs low side etc, RF suppression etc).
Cheers
Bob
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