An Arduino Interrupt is useful when you need a program to react virtually instantly to an event. Final calculation for Freq_OVF is : Freq_OVF = Freq / scale* (255 – TCNT2init) edit Arduino Software Serial User Guide¶. This table lists the interrupts supported by the ATmega328P microcontroller (Arduino UNO): Arduino Interrupt Programming In this tutorial a number is incremented from 0 which displays continuously in (16x2) LCD connected to the Arduino Nano, whenever the left push button (interrupt pin D3) is pressed the LED goes ON and display shows Interrupt2, and when the right push button (interrupt pin D2) is pressed the LED goes OFF and display. The Arduino mini (ATMEGA168) that I use has two external hardware interrupts: numbers 0 (on digital pin 2) and 1 (on digital pin 3). Serial interrupt arduino For Idle, I would expect UART to work, otherwise you need to use INT0, INT1, or "Pin Change", In the I/O ports section it says "SLEEP is overridden for port pins enabled as external interrupt pins.
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