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Another great Darlington device is the ULN2803, which is 8 Darlington transistors on a chip allowing you to drive many DC motors or solenoids at one time.
8 Darlington Arrays in 18-Pin DIP Package part # ULN2803A is ideal for running relays and high-power devices up to 500mA and up to 50V.
You can purchase from Sparkfun for as little as $1.95 at the time of this writing. Here is the Datasheet on the ULN2803. While you can run many motors you can also run a single motor off of one ULN2803. I like the ULN2803 these as you can bypass the diode in the design.
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| Copyright Ken Rinaldo |
The code to drive this motor would be the same as using the TIP 120 or TIP 122 though without the protection diode which is built into the ULN2803.
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| Copyright Ken Rinaldo |
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Chapter 12 