#include <Stepper.h>
#include <LiquidCrystal_I2C.h>

const int stepsPerRevolution = 200;
Stepper stepper(stepsPerRevolution, 3, 4);

const int up = 2; // Change this to the pin where your button is connected
const int down = 1;
int motorSpeed = 60; // Desired RPM

LiquidCrystal_I2C lcd(0x27, 16, 2); // Change the I2C address if necessary


void setup() {
  pinMode(up, INPUT_PULLUP);
  pinMode(down, INPUT_PULLUP);

  stepper.setSpeed(map(motorSpeed, 0, 60, 0, stepsPerRevolution));


  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("RPM: ");
}

void loop() {
  // Check if the button is pressed
  if (digitalRead(up) == LOW) {
    // Debounce delay
    motorSpeed += 30; // Increase speed by 1 RPM

    // Update the motor speed
    stepper.setSpeed(map(motorSpeed, 0, 60, 0, stepsPerRevolution));
  } else if (digitalRead(down) == LOW) {
    motorSpeed -= 30;
    if (motorSpeed < 1) {
      motorSpeed = 60;
    }

    stepper.setSpeed(map(motorSpeed, 0, 60, 0, stepsPerRevolution));
  }

  // Set the direction to clockwise
  digitalWrite(4, LOW);

  // Rotate the motor one full revolution
  stepper.step(stepsPerRevolution);

  // Set the direction back to counterclockwise
  digitalWrite(4, LOW);

  // Calculate and display RPM
  float rpm = motorSpeed;
  lcd.setCursor(5, 0);
  lcd.print(rpm, 1);
  lcd.print("   "); // Clear any previous characters
}