A timer is a specialized type of clock for measuring time intervals. A timer which counts upwards from zero for measuring elapsed time is often called a stopwatch, a device which counts down from a specified time interval is more usually called a timer. A simple example is an hourglass. Some timers sound an audible indication that the time interval has expired. Time switches, timing mechanisms which activate a switch, are sometimes called "timers".
Timers and time switches may be free-standing or incorporated into appliances and machines. Their operating mechanism may be mechanical (typically clockwork), electromechanical, or purely electronic (counting cycles of an electronic oscillator). Timing functionality can be provided by software, typically in a computer; the program is often called a "timer".
Read more about Timer: Mechanical Timers, Electromechanical Timers, Electronic Timers, Computer Timers
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... A time switch (also called timer switch or simply timer) is a timer that operates an electric switch controlled by the timing mechanism ... It may be built into power circuits (as with a central heating timer), plugged into a power point with equipment plugged into the timer instead of directly into the power point, or ... The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically ...
... See also Programmable Interval Timer and High Precision Event Timer Computer systems usually have at least one timer ... More sophisticated timers may have comparison logic to compare the timer value against a specific value, set by software, that triggers some action when the ... As the number of hardware timers in a computer system or processor is finite and limited, operating systems and embedded systems often use a single hardware timer to implement an extensible set of ...
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