How to control a variable speed dc motor using microcontroller?

i want to make a working model of dc motor controlled boat using microcontroller and also want to make it remote controlled,if possible...can you give any suggestion ?How to control a variable speed dc motor using microcontroller?
Just change voltage.How to control a variable speed dc motor using microcontroller?
You can't just change the voltage, that would mean increasing the current, which would lead to heating up the motor. The best method to use, especially with the microcontrollers is to use PWM. with an H-Bridge or an H-Bridge IC such as the L292 or the L298. Please look up PWM on Wiki.

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