Arduino Multithreading

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For most Arduino, hardware multi-threading is not supported:

  • Threads
  • Delays
  • Hardware Interrupts

Hardware Interrupt

Run a short piece of code everytime a pin state changes. It breaks from the loop() and goes back where it left off once the ISR has been ran.

2 pins : [D2] and [D3] pins (Digital) attachInterrupt(0, IRS, ...) for [D2] attachInterrupt(1, IRS, ...) for [D3]

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void setup() //Initialize
{
pinMode(sensorPin, Input)

}

void loop()
{
  int counter = 0;
  attachinterrupt(0, notify, RISING) ; //or FALLING
}

void notify()
{
digitalWrite(notifyPin, HIGH);
}

Alternative code :

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void loop()
{
  noInterrupts();
  //critical, time sensitive code here
  Interrupts();
  //other code here
}