How do I write a program for a DC Fan speed controlled with LM35, using Arduino?

Apparatus: 1)arduino mega 25602)IC (L293D) 3)DC fan (12V)4)LM35 ( Temperature sensor) or:Apparatus: 1)arduino mega 25602)IC (L293D) 3)DC fan (12V)4)LM

Apparatus: 1)arduino mega 2560
2)IC (L293D)
3)DC fan (12V)
4)LM35 ( Temperature sensor)

or:Apparatus: 1)arduino mega 25602)IC (L293D) 3)DC fan (12V)4)LM35 ( Temperature sensor)

Tags:speed,write,