how to print 1 line, not 60 lines when print to file

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bpmmpb

how to print 1 line, not 60 lines when print to file

in Programming Questions • 4 months ago

Hello

I am recording temperature data to a txt file every minute but the sketch cycles 60 times a second so saves 60 data lines each minute. I have tried below which still prints more than one line.

int s = second();
for (int i = 0; i < 1; i = i+1) {
if(s == 0)output.println(da + "/" + mo + "/" + yr +","+ hour +":"+ min +":"+ sec + ","+ temp121 + ","+ temp122+ ","+ temp123);
}

Replies(2)

GoToLoop

Re: how to print 1 line, not 60 lines when print to file

4 months ago

I've got an unorthodox solution. What about use a separate thread to deal w/ that save stuff only?

This way, you don't have to worry about that while doing other stuff within draw()!

Here's a general idea on how to do it.

Of course, all of those variables have to be "global" in order for thread timedSaved() access them:

// ...

final static int WAITING = 60 * 1000;
boolean isActive = true;

// ...

void setup() {
  // ...

  thread("timedSave");
}

void draw() {
  // ...
}

void timedSave() {
  while (isActive) {
    output.println(da + "/" + mo + "/" + yr + "," + hour + ":" + min + ":"
      + sec + "," + temp121 + "," + temp122 + "," + temp123);
    delay(WAITING);
  }
}

PhiLho

Re: how to print 1 line, not 60 lines when print to file

4 months ago

Replace if (s == 0) with:
if (millis() % 60000)
This should go to zero every 60 seconds.
Mmmm, but you risk to miss the precise millisecond it happens.
Rather use something like:

int lastTime;
...
if (millis() - lastTime >= 60000)
{
lastTime = millis();
// Save your stuff
}

Very classical stuff...

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