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A timer --is
one of the most useful electronic devices in the market. Sometimes it is
impossible to imaging our life without it.-- is a specialized type of clock used to control the
sequence of an event or process.
Timers can be mechanical, electromechanical or digital,
Digital timers can achieve higher precision than mechanical timers and so
inexpensive that an electronic digital timer is now less expensive than many
mechanical and electromechanical timers. Individual timers are implemented as a
simple single-chip computer system
Early mechanical timers used typical clockwork mechanisms, such as an
escapement and spring to regulate their speed.
Electromechanical timers have two types. A thermal type has a metal
finger made of two metals with different rates of thermal expansion and
a cam timer uses a small synchronous AC motor turning a cam against a
comb of switch contacts.
Electronic timers are quartz clocks with special electronics and can be
analog or digital
Most timers are now implemented in software and computer systems usually
have at least one timer. These are typically digital counters that
either increment or decrement at a fixed frequencye taken with software
timer implementation if issues such as timer drift and delayed
interrupts is to be minimised.
Especially, a device used to measure the amount of time
something takes, or a device that can be set to sound an alarm after a
certain amount of time.
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