![]() The declared function cannot accept input values and cannot return values when it terminates. The execution of the function that is declared for execution at the interrupt signal starts. When an interrupt signal is received, work in the loop() is paused. How Interrupts are Handled in the Arduino Determination of a change in output state.The main reasons why an interrupt needs to be called are: No special features are required from the hardware device. Instead, all necessary actions are performed by the interrupt handler without affecting the main program. This saves CPU time that, without interrupts, would be spent checking the status of the UART. The processor immediately calls an interrupt handler, which captures the symbol in time. ![]() An external hardware device signals an interrupt. For example, with UART interrupts, you don’t have to keep track of every character coming in. Interrupts are helpful in Arduino programs because they help solve timing problems.
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