#include <Servo.h>

Servo miServo;
#define servoVcc 6
#define servoCrtl 5

int minAngle=0, maxAngle=180, angle=0;

/*
  LED Display
*/

const int numLeds = 10;
const byte led[numLeds] = {23,25,27,29,31,33,35,37,39,41};
int ledIndex = 0;

/*
  Buttons
*/

#define downBttn 9
#define upBttn 8

/*
  RGB LED
*/

const byte channels = 3;
const int rgb[channels]={A0,A1,A2};

/*
  Timers
*/

int timer0 = 100, timer1=1000, rgbDelay=20;

void setup() {
  miServo.attach(servoCrtl);
  pinMode(servoVcc,OUTPUT);
  digitalWrite(servoVcc,HIGH);

  for(int i=ledIndex;i<numLeds;i++){
    pinMode(led[i], OUTPUT);
    digitalWrite(led[i],LOW);
  }
  digitalWrite(led[ledIndex],HIGH);

  pinMode(upBttn, INPUT_PULLUP);
  pinMode(downBttn, INPUT_PULLUP);

  for(int i=0;i<channels;i++){
    pinMode(rgb[i],OUTPUT);
    digitalWrite(rgb[i],LOW);
  }
  digitalWrite(rgb[1],HIGH);

  delay(timer1);
}

void loop() {
  upDetect();
  downDetect();
  servoAngle();
  rgbNeon();
  delay(50);
}

void upDetect(){
  if(!digitalRead(upBttn)){
    digitalWrite(led[ledIndex],LOW);
    ledIndex = max(0,ledIndex-1);
    digitalWrite(led[ledIndex],HIGH);
    delay(timer0);
  }
}

void downDetect(){
  if(!digitalRead(downBttn)){
    digitalWrite(led[ledIndex],LOW);
    ledIndex = min(numLeds-1,ledIndex+1);
    digitalWrite(led[ledIndex],HIGH);
    delay(timer0);
  }
}

void servoAngle(){
  angle = map(ledIndex,0,numLeds-1,minAngle,maxAngle);
  miServo.write(angle);
}

void rgbNeon(){
  static double crTime = 0, psTime = 0;
  static short rgbIndex = 0;
  static int dimm = 0, maxDimm = 255, minDimm = 0, increment=1;

  if(crTime - psTime >= rgbDelay){
    psTime = crTime;

    if(dimm<minDimm || dimm>maxDimm){
      increment = increment * (-1);
      if(dimm<minDimm){
        if(rgbIndex<3){
          rgbIndex++;
        }else{
          rgbIndex=0;
        }
      }
    }
    dimm+=increment;
    analogWrite(rgb[rgbIndex],dimm);
    
  }
  crTime = millis();
}