#include <LiquidCrystal_I2C.h>
#include <IRremote.h>

LiquidCrystal_I2C lcd(0x27,16,2);
int receiver_pin=7;

int step_pin = 4;
int dir_pin = 5;

bool rotate = false; //flag
bool direction = HIGH;

int stepDelay=10000;


void setup() {
lcd.begin(16,2);
lcd.backlight();
lcd.setCursor(0,0);
lcd.print("IR remote");

pinMode(step_pin, OUTPUT);
pinMode(dir_pin, OUTPUT);

IrReceiver.begin(receiver_pin,ENABLE_LED_FEEDBACK);

    Serial.begin(9600);



}

void loop() {
if(IrReceiver.decode())
  {
      int value = IrReceiver.decodedIRData.command;
      handle(value);
      IrReceiver.resume();
  }

  if(rotate){
    rotateMotor();
  }
}

void handle(int value){
switch (value) {
    case 162:
      Serial.print(162); // Power
      break;
    case 226:
      Serial.print(226); // Menu
      break;
    case 34:
      Serial.print(34); // Test
      break;
    case 2:
      stepDelay = max(stepDelay-1000, 1000);// Plus
      displaySpeed();
      break;
    case 194:
      Serial.print(194); // Back
      break;
    case 224:
      direction= LOW; // Previous
      break;
    case 168:
        rotate=true; // Play
      break;
    case 144:
      direction=HIGH; // Next
      break;
    case 104:
      rotate=false; // 0
      break;
    case 152:
       stepDelay = min(stepDelay+1000, 10000); // Minus
       displaySpeed();
      break;
    case 176:
      Serial.print(176); // C
      break;
    case 48:
      Serial.print(48); // 1
      break;
    case 24:
      Serial.print(24); // 2
      break;
    case 122:
      Serial.print(122); // 3
      break;
    case 16:
      Serial.print(16); // 4
      break;
    case 56:
      Serial.print(56); // 5
      break;
    case 90:
      Serial.print(90); // 6
      break;
    case 66:
      Serial.print(66); // 7
      break;
    case 74:
      Serial.print(74); // 8
      break;
    case 82:
      Serial.print(82); // 9
      break;
    default:
      Serial.println("Unknown command"); // For unknown commands
      break;
  }
}

void rotateMotor(){
  
  digitalWrite(dir_pin, direction);
  digitalWrite(step_pin, HIGH);
  delayMicroseconds(stepDelay);
  digitalWrite(step_pin, LOW);
  delayMicroseconds(stepDelay);
  
}

void displaySpeed()
{
  float stepsPerSeconds = 1000000/stepDelay;
  float rpm = (stepsPerSeconds/200)*60;
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("rpm: ");
  lcd.print(rpm, 2);
}