Measuring time interval between on and off in float switch

Projects Programming
1

Hi, i would like to know if it is possible to measure the time interval between the on and off of the float switch? I will use it in my project. is there someone here who knows the code? please help me, thanks!

3

Give this a try, change pin number to suit.

unsigned long floatSwTimer;
bool floatSwState;
byte floatSw = 4; // Float switch pin, other side of switch to GND

void setup()
{
  Serial.begin(9600);
  pinMode(floatSw,INPUT_PULLUP);
}

void loop()
{
  if(digitalRead(floatSw) != floatSwState) // if they are different,
  {
    floatSwState ^= 1; // make them the same
    if(floatSwState == false)
    {
      Serial.print("Float switch OFF time  ");
      Serial.print((millis() - floatSwTimer) / 1000);
      Serial.print("\t");
      Serial.println("Seconds");
    }
    else
    {
      Serial.print("Float switch ON  time  ");
      Serial.print((millis() - floatSwTimer) / 1000);
      Serial.print("\t");
      Serial.println("Seconds");
    }
    floatSwTimer = millis(); // reset timer
  }
}

If you get "false trips" from the float sw bobbing up and down, you may have to "debounce" it.