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Yes, an interrupt can occur at any time and can change the values during a calculation. … For this you can turn off all or only the corresponding interrupt. To turn off all interrupts you can use noInterrupts() and interrupts() to turn them on again. …

That is simply the difference between an external interrupt INTx and a pin change interrupt PCINT. The first is an interrupt for a single pin. The second is an interrupt for a complete group of pins. … So the whole group is only 1 single interrupt source. Thus it only has one interrupt vector named PCINT0_vect. A pin change interrupt triggers, when any of the pins under it's supervision changes. …

First: It is not necessary to use interrupts for buttons, because when humans press buttons they will be at least actived for about 100ms, which is very slow for a microcontroller. You would just need …

Using the PinChange interrupt and doing counting in software: Since the ATtiny85 has only 1 external interrupt, you have to use the PinChange interrupt for this. … During the short time period between the first interrupt and the completed execution of the ISR no other PinChange interrupt will get registered. …

An ISR should be kept as short as possible, since while it runs, no other interrupts can be handled (including the one powering the delay() function. Thus you cannot delay that easy inside an ISR and …

what to write instead of dely() in interrupt function? Nothing. An interrupt service routine (ISR) should not do any things, that take long. …

The onReceive callback is called from an interrupt service routine (ISR). As the name says, interrupts are "interrupting" the currently executing code almost immediately. … It will interrupt in the line, where it was when the interrupt occured, and return to it after the ISR returns. …

The error message says, that in the constructor of Dimmer it cannot find a matching constructor of DimmerGlider. The problem here is that you pass the parameters by value, which will create a new vari …

The time between 2 interrupt triggers is only 8us. Also digitalRead() is a quite big function, that needs some time to execute (I don't know how much). … Also you should consider making the variable val volatile, since it will can change everytime through your interrupt service routine. …

No interrupt will be triggered. …

You are using a timer interrupt and an external (pin) interrupt. The compiled program lies in the flash of the chip. At the start there are some special addresses for the different interrupts. … If the hardware then registers a condition for an interrupt, it will stop the execution of the main code (the code, that was executed, when the interrupt condition occured), saving the current state and …

The Atmega328p (which is used in the Un[ (and actually all other AVR microcontrollers) has clamping diodes in the input hardware to protect it from overvoltage (above Vcc). When not powered, Vcc is at …

The interrupt on pin 2 triggers, because the pin is floating. Since nothing is connected to the pin, it reacts to whatever noise is flying by (for example from pin 3). …

Your usecase doesn't seem to belong to the interrupt needed faction. …

Though to be complete: When interrupts are involved and you change global variables inside an interrupt service routine, you need to be very careful. … Single byte variables are not problem, but with multi-byte variables you can get scrambled data, as the interrupt might occur in the middle of processing that variable. …