const int RedLed = 10;
const int GreenLed = 9;
const int BlueLed = 8;
const int RedUp = 12;
const int RedDown = 13;
const int GreenUp = 4;
const int GreenDown = 5;
const int BlueUp = 2;
const int BlueDown = 3;
int redBrightness = 0;
int greenBrightness = 0;
int blueBrightness = 0;
int lastButtonBlueUp = LOW;
int curButtonBlueUp = LOW;
int lastButtonBlueDown = LOW;
int curButtonBlueDown = LOW;
int lastButtonRedUp = LOW;
int curButtonRedUp = LOW;
int lastButtonRedDown = LOW;
int curButtonRedDown = LOW;
int lastButtonGreenUp = LOW;
int curButtonGreenUp = LOW;
int lastButtonGreenDown = LOW;
int curButtonGreenDown = LOW;

int debounce(int last, int buttonNum){
  int current = digitalRead(buttonNum);
  if(last != current){
    delay(5);
    current = digitalRead(buttonNum);
  }
  return current;
}

void setup() {
  Serial.begin(9600);
  pinMode(BlueLed, OUTPUT);
  digitalWrite(BlueLed, HIGH);
  pinMode(GreenLed, OUTPUT);
  digitalWrite(GreenLed, HIGH);
  pinMode(RedLed, OUTPUT);
  digitalWrite(RedLed, HIGH);
  pinMode(RedUp, INPUT);
  pinMode(RedDown, INPUT);
  pinMode(GreenUp, INPUT);
  pinMode(GreenDown, INPUT);
  pinMode(BlueUp, INPUT);
  pinMode(BlueDown, INPUT);
}

void loop() {
  curButtonBlueUp = debounce(lastButtonBlueUp, BlueUp);
  curButtonBlueDown = debounce(lastButtonBlueDown, BlueDown);
  curButtonRedUp = debounce(lastButtonRedUp, RedUp);
  curButtonRedDown = debounce(lastButtonRedDown, RedDown);
  curButtonGreenUp = debounce(lastButtonGreenUp, GreenUp);
  curButtonGreenDown = debounce(lastButtonGreenDown, GreenDown);

  if(lastButtonBlueUp == HIGH && curButtonBlueUp == LOW){
    digitalWrite(RedLed, HIGH);
    digitalWrite(GreenLed, HIGH);
    //redBrightness = 0; Можно обнулить яркость других цветов
    //greenBrightness = 0;
    if(blueBrightness<250) {
      blueBrightness += 50;
      }
    analogWrite(BlueLed, blueBrightness);
  }
  lastButtonBlueUp = curButtonBlueUp;

  if(lastButtonBlueDown == HIGH && curButtonBlueDown == LOW){
    digitalWrite(RedLed, HIGH);
    digitalWrite(GreenLed, HIGH);
    //redBrightness = 0;
    //greenBrightness = 0;
    if(blueBrightness>0) {
      blueBrightness -= 50;
      }
    analogWrite(BlueLed, blueBrightness);
  }
  lastButtonBlueDown = curButtonBlueDown;

  if(lastButtonRedUp == HIGH && curButtonRedUp == LOW){
    digitalWrite(BlueLed, HIGH);
    digitalWrite(GreenLed, HIGH);
    //blueBrightness = 0;
    //greenBrightness = 0;
    if(redBrightness<250) {
      redBrightness += 50;
      }
    analogWrite(RedLed, redBrightness);
  }
  lastButtonRedUp = curButtonRedUp;

  if(lastButtonRedDown == HIGH && curButtonRedDown == LOW){
    digitalWrite(BlueLed, HIGH);
    digitalWrite(GreenLed, HIGH);
    //blueBrightness = 0;
    //greenBrightness = 0;
    if(redBrightness<250) {
      redBrightness -= 50;
      }
    analogWrite(RedLed, redBrightness);
  }
  lastButtonRedDown = curButtonRedDown;

  if(lastButtonGreenUp == HIGH && curButtonGreenUp == LOW){
    digitalWrite(BlueLed, HIGH);
    digitalWrite(RedLed, HIGH);
    //blueBrightness = 0;
    //redBrightness = 0;
    if(greenBrightness<250) {
      greenBrightness += 50;
      }
    analogWrite(GreenLed, greenBrightness);
  }
  lastButtonGreenUp = curButtonGreenUp;

  if(lastButtonGreenDown == HIGH && curButtonGreenDown == LOW){
    digitalWrite(BlueLed, HIGH);
    digitalWrite(RedLed, HIGH);
    //blueBrightness = 0;
   //redBrightness = 0;
    if(greenBrightness<250) {
      greenBrightness -= 50;
      }
    analogWrite(GreenLed, greenBrightness);
  }
  lastButtonGreenDown = curButtonGreenDown;
  Serial.println(redBrightness);
  Serial.println(blueBrightness);
  Serial.println(greenBrightness);
}