Turning on light from 6pm to 6am using ds3231

Projects Programming
1

badly need help on this one

2

You need an extra variable that keeps track if the light is on or off.

bool lights;      // true when lights are on, false if lights are off.

void loop()
{
  ...

  if(!lights and Hour == 18)      // 6 p.m. and lights are not on ?
  {
    digitalWrite(LED, HIGH);      // turn light on
    lights = true;                // remember that the lights are on
  } 
  else if(lights and Hour == 6)   // lights are on and it is 6 a.m. ?
  {
    digitalWrite(LED, LOW);
    lights = false;
  }

  ...
}
1 Like
3

In your case, you don't need to know the minutes value.

You can avoid handling the crossover at midnight by looking when the light should be off - i.e if hours > 5 and hours < 18.

And rather than constant digitalWrites, use the idea suggested above.

1 Like
4

An extra boolean isn't need. The output pin state is the same as the boolean.

The state of the pin change once between 6 and 18 and once outside that time

  if(Hour >= 6 && Hour <= 18){
    if(digitalRead(LED)){
      digitalWrite(LED, LOW);
    }    
  }
  else if(!digitalRead(LED)){
    digitalWrite(LED, HIGH);
  }


Hour == 6 and Hour == 18

Is tricky code. If the application starts at 19h it does nothing for the whole night.

1 Like
5

i tried this one and it worked, thank you so muuuuuch

1 Like
6

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