DC, bulb dimmer & motor speed control using arduino with LCD.

dimmer_&_speed_controll.ino

// include the library code:
#include <LiquidCrystal.h> // use the library for Display
#include <IRremote.h> // use the library for IR

const int receiver = 10; // pin of IR receiver to Arduino
const int bulb =  9; // To bulb or whatever you connect.
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int fadeValue;
int lastCounter = 1;
int counter;

#define code1  32895 // code received from button A
#define code2  36975 // code received from button B

IRrecv irrecv(receiver); // create instance of 'irrecv'
decode_results results;


void setup() {
  Serial.begin(9600);   // you can comment this line
  //Set up the output pin
  pinMode(bulb, OUTPUT);
  //Ir 
  irrecv.enableIRIn();
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
}

void loop() {
  lcd.setCursor(0, 0); // set cursor to top left & first colum
  lcd.print("Bulb Dimmer!");
  
  counter = lastCounter;
  if (irrecv.decode(&results))
  {
    unsigned int value = results.value;
    if (value == code1) {
      counter ++;
      lcd.clear();// clear lcd
    }
    if (value == code2) {
      counter --;
      lcd.clear(); // clear lcd
    }

    Serial.println("IR receive code"); Serial.println(value); // you can comment this line
    irrecv.resume();
  }

  if (counter > 5) {    //maximum for counter = 5
    counter = 5;
          
  }

  if (counter < 2) {    //minimum for counter = 1
    counter = 1;
  }

  switch (counter) {   //depending on the counter the fadevalue is sent to the led

    case 1:
      fadeValue = 00;
      lcd.setCursor(0, 1); // set cursor to bottom left & second colum
      lcd.print("OFF PRES VOL+"); // LCD print
      break;

    case 2:
      fadeValue = 50;
      lcd.setCursor(0, 1); // set cursor to bottom left & second colum
      lcd.print("Speed 1"); // LCD print
      break;

    case 3:
      fadeValue = 120;
      lcd.setCursor(0, 1); // set cursor to bottom left & second colum
      lcd.print("Speed 2"); // LCD print
      break;

    case 4:
      fadeValue = 185;
      lcd.setCursor(0, 1); // set cursor to bottom left & second colum
      lcd.print("Speed 3"); // LCD print
      break;

    case 5:
      fadeValue = 255;
      lcd.setCursor(0, 1); // set cursor to bottom left & second colum
      lcd.print("MAX PRES VOL-"); // LCD print
      break;

  }

  analogWrite(bulb, fadeValue);    //set led with PWM value
  lastCounter = counter;          //reset counter

}

See this code in action on -> tinkercad