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Arduino Motor Speed Control Using PWM

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Description

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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