Delay doen't function well (PROBLEM SOLVED)

Projects Programming
1

As a part of a large program, I use IRQ0 for triggering the impulse from an energy counter (kWh-meter).
A LED has to flash a shortwhile as an ackknowdge for the receipt of this impulse.

It seems that the code for the flashing LED functions very fast; if I place the same code within the(main)loop it function well.

Can anybody explain me why?

/* pulse counting from energycounter (kWh-meter)
Arduino Mega 2560
Pulse on IRQ0 (pin2)
LED on pin 12
*/

#define kWhpulsLED 12
#define off 1
#define on 0

void setup() {
pinMode(12, OUTPUT);                //kWh-LED
pinMode(2, INPUT);                  //kWh-takt via IRQ0
digitalWrite(2, HIGH);              //Pull up resistance
digitalWrite(kWhpulsLED,off);       //turn kWhpulsLED off
attachInterrupt(0, puls, RISING);   //IRQ0 will start void pulse
}

//========================================================================================
void loop() {
  // put your main code here, to run repeatedly: 
/*
delay(1000);
digitalWrite(kWhpulsLED,on);        //turn kWhpulsLED on
delay(1000);
digitalWrite(kWhpulsLED,off);       //turn kWhpulsLED off
*/
}

//========================================================================================
void puls() {
digitalWrite(kWhpulsLED,on);         //turn kWhpulsLED on
delay(1000);
digitalWrite(kWhpulsLED,off);        //turn kWhpulsLED off
}
2

You can not use delay() in an interrupt service routine. While the ISR is running, other interrupts are disabled. The delay() function expects millis() to return increasing values, which can only happen while interrupts are enabled.

3

From attachInterrupt

Note

Inside the attached function, delay() won't work and the value returned by millis() will not increment. Serial data received while in the function may be lost. You should declare as volatile any variables that you modify within the attached function.

4

Thanks guys for your fast response.