Project 1 - Controlling a DC motor using PWM and monitoring its Running status

In this project, I have implemented speed and direction control of a DC motor using a PWM signal. The project takes speed and direction inputs from the user and drives the motor accordingly. An oscilloscope is employed to monitor the PWM signals.

//CODE 

#include

#include

int speed = 0;  

String userInput;

LiquidCrystal_I2C lcd(32, 16, 2); 

void setup(){

  lcd.init();                 

  lcd.backlight(); 

  pinMode(3, OUTPUT);

  pinMode(4, OUTPUT);

  pinMode(9, OUTPUT);

  Serial.begin(9600);  // Initialize serial communication at 9600 baud

  lcd.begin(16, 2);  // Initialize the LCD with 16 columns and 2 rows

  lcd.setCursor(0, 0);

}

void loop(){

  Serial.println("Enter speed (0-255): ");

  while (!Serial.available()) {

    // Wait for user input

  }

  speed = Serial.parseInt();

  speed = constrain(speed, 0, 255);

  Serial.println("Enter F for forward and R for reverse "); 

  while (!Serial.available()) {

    // Wait for user input

  }

  userInput = Serial.readString(); // Read the user input as a string

  userInput.trim(); // Remove leading and trailing whitespaces

  Serial.print("You entered: ");

  Serial.println(userInput);

  if(userInput == "F" || userInput == "f") {

    delay(100);

    digitalWrite(3, LOW);

    digitalWrite(4, HIGH);

    lcd.setCursor(0, 1);

    lcd.print("Dir = Forward");

  } 

  else if (userInput == "R" || userInput == "r") {

    delay(100);

    digitalWrite(3, HIGH);

    digitalWrite(4, LOW);

    lcd.setCursor(0, 1);

    lcd.print("Dir = Reverse");

  } 

  else {

    Serial.println("Only enter F or R");

  }

  analogWrite(9, speed);

  lcd.setCursor(0, 0);

  lcd.print("           "); 

  lcd.setCursor(0, 0);

  String displayText = "Speed = " + String(speed) + " RPM";

  lcd.print(displayText);

  delay(300);

}

THE LINK FOR THINKER CAD :

https://www.tinkercad.com/things/jXuE20PLmN4-pmw-project-1/editel?sharecode=QJsoX9_-uYj1Ulby4Wv-55JHJqnQFPvBBdxhiUeqWpI