long time

Projects Programming
10

You could use a timer library, or simply:

const unsigned long oneDay = 86400000;
unsigned long lastRun = 0;

void doEvery24Hours()
{
  //The code in this method will only be executed once every 24 hours.
}

void setup()
{
  //Whatever
}

void loop()
{
  unsigned long millisNow = millis();
  if (millisNow - lastRun >= oneDay)
  {
    lastRun = millisNow;
    doEvery24Hours();
  }
}

Using a timer like TTimer from TDuino could be implemented as:

#include <TDuino.h>
const unsigned long oneDay = 86400000;

TTimer timer(timerCallback);

void timerCallback(byte timerId)
{
  //The code in this method will only be executed once every 24 hours.
}

void setup()
{
  timer.setup();
  timer.set(oneDay, 0);
}

void loop()
{
  timer.loop();
}