int ledPin = 27;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(ledPin, HIGH);
  delay(500);
  digitalWrite(ledPin,LOW);
  delay(500);
  Serial.println("Hello LED");
}

int ledPin[3]= {27,26,25};

int LightArray[7][3]={

{ 0,0,0},

{ 0,0,1},

{ 0,1,1},

{ 1,1,1},

{1,1,0},

{1,0,0},

{0,0,0},

};

int ledtmp = 0,i=0;

void setup()

{

Serial.begin(115200);

pinMode(ledPin[0], OUTPUT);

pinMode(ledPin[1], OUTPUT);

pinMode(ledPin[2], OUTPUT);

}

void loop()

{

for(i=0;i<3;i++)

{

if(LightArray[ledtmp][i] == 0)

digitalWrite(ledPin[i], LOW);

else if(LightArray[ledtmp][i] == 1)

digitalWrite(ledPin[i], HIGH);

}

if(ledtmp >= 7)

ledtmp=0;

else

ledtmp++;

delay(1000);

}