Counting elapsed time? using TimeLib

Need Help With My Project
1

so i want to count how long my fire is burning and how long since i last added a log.

i tried with this code below, but obviously i have no idea how to do maths with time - so it doesn’t work:

int startFire, burnTimeTimer, logTimeTimer;
float addSmlLog, minusSmlLog, addBigLog, minusBigLog, totalLogs, totalSmlLogs, totalBigLogs;
float burnTime, lastLogTime, startTime, timeSinceLastLog;

BLYNK_WRITE(V10) {  // start/stop fire button
  startFire = param.asInt();
  if (startFire == 1) {
    burnTime = 0;
    startTime = now();
    burnTimeTimer = timer.setTimeout(10L * 1000L, fireTimer);// timing counts every 10 seconds
    fireTimer();
  }
   else if (startFire == 0) {
    burnTime = burnTime;
    timer.disable(burnTimeTimer);
  }
}

void fireTimer() {
  if (startFire == 1) {
    burnTime = (now() - startTime);
    Blynk.virtualWrite(V14, burnTime);
  }
}

and

BLYNK_WRITE(V11) {  // add sml log button
  addSmlLog = param.asInt();
  if (addSmlLog == 1) {
    totalSmlLogs = (totalSmlLogs + 1);
    totalLogs = (totalLogs + 0.5);
    Blynk.virtualWrite(V12, totalSmlLogs);
    Blynk.virtualWrite(V20, totalLogs);  //
    lastLogTimer();
  }
}
BLYNK_WRITE(V13) {  // minus sml log button
  minusSmlLog = param.asInt();
  if (minusSmlLog == 1) {
    totalSmlLogs = (totalSmlLogs - 1);
    totalLogs = (totalLogs - 0.5);
    Blynk.virtualWrite(V12, totalSmlLogs);  //
    Blynk.virtualWrite(V20, totalLogs);  //
    lastLogTimer();
  }
}
BLYNK_WRITE(V18) {  // add big log button
  addBigLog = param.asInt();
  if (addBigLog == 1) {
    totalBigLogs = (totalBigLogs + 1);
    totalLogs = (totalLogs + 1);
    Blynk.virtualWrite(V19, totalBigLogs);  //
    Blynk.virtualWrite(V20, totalLogs);  //
    lastLogTimer();
  }
}
BLYNK_WRITE(V17) {  // minus big log button
  minusBigLog = param.asInt();
 if (minusBigLog == 1) {
    totalBigLogs = (totalBigLogs - 1);
    totalLogs = (totalLogs - 1);
    Blynk.virtualWrite(V19, totalBigLogs);  //
    Blynk.virtualWrite(V20, totalLogs);  //
    lastLogTimer();
  }
}
void lastLogTimer() {
  if ((addBigLog == 1) || (addSmlLog == 1))  {
    timeSinceLastLog = (now() - lastLogTime);
    Blynk.virtualWrite(V15, timeSinceLastLog);
    lastLogTime = now();
  }
}

and i get this crazy looking number for “time since last log”

woodheatermonitor.png720×1280 79.3 KB

what do i use instead of float for these time variables?

1 Like
2

or should i use millis() to count time?

3

Try changing the time variables from float to long, if that doesn’t work I would go with millis().

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