//Prepare sketch to control LED brightness connected on data pins D0, D1 and D2 after delay of 1 second on alternate basis using NodeMCU

int switchmode=0;
const int freq = 5000;
const int ledChannel = 0;
const int resolution = 8;
 
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(21, OUTPUT);//red
  pinMode(19, OUTPUT);//yellow
  pinMode(18, OUTPUT);//green
  pinMode(12,INPUT);
}

void setup(){
  // configure LED PWM functionalitites
  ledcSetup(ledChannel, freq, resolution);
  
  // attach the channel to the GPIO to be controlled
  ledcAttachPin(ledPin, ledChannel);
}
 
void loop(){
  // increase the LED brightness
  for(int dutyCycle = 0; dutyCycle <= 255; dutyCycle++){   
    // changing the LED brightness with PWM
    ledcWrite(ledChannel, dutyCycle);
    delay(15);
  }

  // decrease the LED brightness
  for(int dutyCycle = 255; dutyCycle >= 0; dutyCycle--){
    // changing the LED brightness with PWM
    ledcWrite(ledChannel, dutyCycle);   
    delay(15);
  }
}

// the loop function runs over and over again forever
void loop() {
  {
    //R-Y-G
  digitalWrite(21, HIGH);   
  delay(1000);                    
  digitalWrite(21, LOW);    
  delay(1000); 

  digitalWrite(19, HIGH);   
  delay(1000);              
  digitalWrite(19, LOW);    
  delay(1000); 
  
  digitalWrite(18, HIGH);   
  delay(1000);                      
  digitalWrite(18, LOW);    
  delay(1000); 

  //G-Y-R
  digitalWrite(18, HIGH);   
  delay(1000);              
  digitalWrite(18, LOW);  
  delay(1000); 
  digitalWrite(19, HIGH); 
  delay(1000);                
  digitalWrite(19, LOW);    
  delay(1000); 
  digitalWrite(21, HIGH);   
  delay(1000);              
  digitalWrite(21, LOW);   
  delay(1000); }
  
  }

// the number of the LED pin
const int ledPin = 16;  // 16 corresponds to GPIO16

// setting PWM properties