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timer() question.

phoenixcomm

Ok, that about says it all. what I need is a timer() which is set to 30,000 ms. (30 seconds). when I push a button to test the lights on the landing system, there are nine of them. I want to do the following:

for (int count = 0;  count < 9; count++ ){
digitalWrite( lamp[count], ON);}
timer = 300000 ms
return;

when timer = 0 set interrupt. 

for (int count = 0;  count < 9; count++ ){
digitalWrite( lamp[count], OFF);}
reset timer();
return;

That sound simple nope I don't want to stop what I am doing so a delay(30000) will not work.

Parents

  • the classic in short code:

    unsigned long startMillis;  //some global variables available anywhere in the program
unsigned long currentMillis;
const unsigned long period = 1000;  //the value is a number of milliseconds
const byte ledPin = 13;    //using the built in LED

void setup()
{
  Serial.begin(115200);  //start Serial in case we need to print debugging info
  pinMode(ledPin, OUTPUT);
  startMillis = millis();  //initial start time
}

void loop()
{
  currentMillis = millis();  //get the current "time" (actually the number of milliseconds since the program started)
  if (currentMillis - startMillis >= period)  //test whether the period has elapsed
  {
    digitalWrite(ledPin, !digitalRead(ledPin));  //if so, change the state of the LED.  Uses a neat trick to change the state
    startMillis = currentMillis;  //IMPORTANT to save the start time of the current LED state.
  }
}

Reply

  • the classic in short code:

    unsigned long startMillis;  //some global variables available anywhere in the program
unsigned long currentMillis;
const unsigned long period = 1000;  //the value is a number of milliseconds
const byte ledPin = 13;    //using the built in LED

void setup()
{
  Serial.begin(115200);  //start Serial in case we need to print debugging info
  pinMode(ledPin, OUTPUT);
  startMillis = millis();  //initial start time
}

void loop()
{
  currentMillis = millis();  //get the current "time" (actually the number of milliseconds since the program started)
  if (currentMillis - startMillis >= period)  //test whether the period has elapsed
  {
    digitalWrite(ledPin, !digitalRead(ledPin));  //if so, change the state of the LED.  Uses a neat trick to change the state
    startMillis = currentMillis;  //IMPORTANT to save the start time of the current LED state.
  }
}

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