#include <EncButton.h>
#define button1 2
#define button2 3
#define button3 4
#define button4 5
#define button5 6
#define button6 7
#define button7 8
#define button8 11
#define tonePin 10
#define LedRed A1
#define LedGreen A2
#define LedBlue A3

Button btn_1(button1, INPUT, HIGH);
Button btn_2(button2, INPUT, HIGH);
Button btn_3(button3, INPUT, HIGH);
Button btn_4(button4, INPUT, HIGH);
Button btn_5(button5, INPUT, HIGH);
Button btn_6(button6, INPUT, HIGH);
Button btn_7(button7, INPUT, HIGH);
Button btn_mode(button8, INPUT, HIGH);

int mode = 0;

void setup() {
  pinMode(tonePin, OUTPUT);
  pinMode(LedRed, OUTPUT);
  pinMode(LedGreen, OUTPUT);
  pinMode(LedBlue, OUTPUT);
  digitalWrite(LedRed, HIGH);
  digitalWrite(LedGreen, LOW);
  digitalWrite(LedBlue, LOW);
}

void loop() {
  tick();
  piano();
  mode_status();
}
void tick() {
  btn_1.tick();
  btn_2.tick();
  btn_3.tick();
  btn_4.tick();
  btn_5.tick();
  btn_6.tick();
  btn_7.tick();
  btn_mode.tick();
}

void piano() {
  if (btn_1.press()) tone(10, 131+ mode); //C
  else if (btn_2.press()) tone(10, 147 + mode); //D
  else if (btn_3.press()) tone(10, 165 + mode); //E
  else if (btn_4.press()) tone(10, 175 + mode); //F
  else if (btn_5.press()) tone(10, 196 + mode); //G
  else if (btn_6.press()) tone(10, 220 + mode); //A
  else if (btn_7.press()) tone(10, 247 + mode); //B
  else noTone(10);
}

void mode_status() {
  if (btn_mode.click()) {
    mode += 220;
    if (mode > 440) mode = 0;
    if (mode == 440) { //blue
      digitalWrite(LedRed, LOW);
      digitalWrite(LedGreen, LOW);
      digitalWrite(LedBlue, HIGH);
    } else if (mode == 220) { //green
      digitalWrite(LedRed, LOW);
      digitalWrite(LedGreen, HIGH);
      digitalWrite(LedBlue, LOW);
    } else if (mode == 0) { //red
      digitalWrite(LedRed, HIGH);
      digitalWrite(LedGreen, LOW);
      digitalWrite(LedBlue, LOW);
    }
  }
}