UNO et MEGA :
 Timer0 => 8bits 
 Timer1 => 16bits
 Timer2 => 8bits
MEGA uniquement :
 Timer3 => 16bits
 Timer4 => 16 bits
 Timer5 => 16bits

UNO
 Timer0 => delay, millis, micros
 Timer1 => servo
 Timer2 => tone, 
 PWM :
  pin5,6  => Timer0
  pin9,10 => Timer1
  pin11,3 => Timer2 
	

MEGA 
 Timer0 
 Timer1
 Timer2
 Timer3
 Timer4
 Timer5 => servo,
 Timer6

