Need Help... Trying to only have ALL LED Blink

Projects General Guidance
1 
int timer = 100;           // The higher the number, the slower the timing.

void setup() {
  // use a for loop to initialize each pin as an output:
  for (int thisPin = 2; thisPin < 8; thisPin++)  {
    pinMode(thisPin, OUTPUT);      
  }
}

void loop() {
  // loop from the lowest pin to the highest:
  for (int thisPin = 2; thisPin < 8; thisPin++) { 
    // turn the pin on:
    digitalWrite(thisPin, HIGH);   
    delay(timer);                  
    // turn the pin off:
    digitalWrite(thisPin, LOW);    
  }

  // loop from the highest pin to the lowest:
  for (int thisPin = 7; thisPin >= 2; thisPin--) { 
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
    delay(timer);
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }
}

Im trying to modify this to where all 6 LEDs come on and then off simultaneously. I am fairly new to this, so any explanation will help

2

Separate this into two loops with a delay between.

  • The first loop turns all pins high.
  • delay
  • The second loop turns all pins low.
3

what do you think this is doing to your led before going to the next pin in the for loop?

4

You can try this:

constexpr int timer {500};
constexpr byte START_PIN {2};
constexpr byte LAST_PIN {7};

void toggleLEDs(byte, byte, byte);

void setup() {
  for (int thisPin = START_PIN; thisPin <= LAST_PIN; thisPin++)  {
    pinMode(thisPin, OUTPUT);
  }
}

void loop() {
  toggleLEDs(HIGH, START_PIN, LAST_PIN);
  delay(timer);
  toggleLEDs(LOW, START_PIN, LAST_PIN);
  delay(timer);
}

void toggleLEDs(byte level, byte startPin, byte lastPin ) {
  for (byte thisPin = startPin; thisPin <= lastPin; ++thisPin) {
    digitalWrite(thisPin, level);
  }
}
5

The Arduino is very fast so when you don't put a delay in a loop it looks like everything happens simultaneously:

void loop()
{
  // loop from the lowest pin to the highest:
  for (int thisPin = 2; thisPin < 8; thisPin++)
  {
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
  }

  delay(timer);

  // loop from the lowest pin to the highest:
  for (int thisPin = 2; thisPin < 8; thisPin++)
  {
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }

  delay(timer);
}
6

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