Interrupt for measuring time

hello guys,

i have tried find suitable had no luck far that's why approach since last hope

i have got electrical engine , want measure frequency runs. rotational meter creates rectangle current. want count how there rise in current , want measure time between 2 flanks.

but have no idea how overall structure looks like. can please me?

you can use interrupt triggered when pin goes low high (voltage) , then, measure time.

code: [select]


unsigned long lasttime;
unsigned long period;

void setup()
{
  attachinterrupt(0, measurefrec, rising);  // arduino pin 2
}

void measurefrec()
{
  unsigned long time;
 
  time = millis();  // beware overflow!!
  period = time - lasttime;
  lasttime = time;
}


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