Arduino Motor Speed Control Using PWM

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Initial experiments to show the kids how Arduino works.
We began with the LED Blinking example, then payed with button and leds. After some questions about motors we finished driving a DC motor and changing speed using PWM...
A 2N2222A transistor was used with a 2.4K resistor at the base.
This motor use less than 20 milliamps @ 3 Volts.
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