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Replacing old model air conditioners with Energy Star units can cut cooling bills by 20 percent or more
 

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INT0 taster AVRWhen reading pin state it is often needed to react very fast on pin state change.
For this purpose external interrupt is used. External interrupt occurs when dedicated pin changes state. It can be triggered on rising, falling, or both edges of signal state. In this example we will use external interrupt  of AVR microcontroller INT0.  

 

 

 

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