/* led_ampel_analog_outputs_dim1
  Dimming LEDs on PWM-pins
  status=15.11.2022
*/
#include <Wire.h>
  
#define TRAFFIC_LIGHT_SPEED 1000

const unsigned int led_red = 5;
const unsigned int led_yellow = 6;//- 8 works, 6 not ?
const unsigned int led_green = 9;
int unsigned counter = 0;

// the setup function runs once when you press reset or power the board
void setup()
{
  Serial.begin(9600);
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(led_red, OUTPUT);
  pinMode(led_yellow, OUTPUT);
  pinMode(led_green, OUTPUT);

  analogWrite(led_red, 255);   
  delay(TRAFFIC_LIGHT_SPEED);                       
  analogWrite(led_red, 0);    
                
  analogWrite(led_yellow, 255);    
  delay(TRAFFIC_LIGHT_SPEED);
  analogWrite(led_yellow, 0);   
  
  analogWrite(led_green, 255);   
  delay(TRAFFIC_LIGHT_SPEED);
  analogWrite(led_green, 0);     
   
}

// the loop function runs over and over again forever
void loop()
{
  
  for(counter=0;counter < 255;counter++)
  {
    analogWrite(led_red, counter);
    delay(10);   
  }
  for(counter=255;counter > 0;counter--)
  {
    analogWrite(led_red, counter);
    delay(10);   
  }           

  for(counter=0;counter < 255;counter++)
  {
    analogWrite(led_yellow, counter);
    delay(10);   
  }
  for(counter=255;counter > 0;counter--)
  {
    analogWrite(led_yellow, counter);
    delay(10);   
  }           
  for(counter=0;counter < 255;counter++)
  {
    analogWrite(led_green, counter);
    delay(10);   
  }
  for(counter=255;counter > 0;counter--)
  {
    analogWrite(led_green, counter);
    delay(10);   
  }               
     
  //Serial.println(counter);
  //counter++;
}