// Fnu Shoaib Ahmed, 652420658, fahme8
// Lab 9 - RGB LED with Joystick and Potentiometer Control

// Description - This code reads values from a two-axis joystick and a potentiometer to control an RGB LED’s color intensity.
//               The joystick’s X-axis controls the Red component, the Y-axis controls the Green component, and the potentiometer controls the Blue component.
//               Separate Red, Green, and Blue LEDs display individual color intensities based on PWM values.

// Assumptions - The circuit includes 220-ohm resistors for each LED to prevent damage, and the PWM pins (9, 10, 11) are used for LED control as specified in the lab requirements.

// References - I referred to lab-provided links for setting up the joystick and potentiometer and for understanding PWM control on Arduino.


// Pin assignments
const int joystickXPin = A0;     // Joystick X-axis for Red control
const int joystickYPin = A1;     // Joystick Y-axis for Green control
const int potentiometerPin = A2; // Potentiometer for Blue control

const int redLEDPin = 9;         // PWM pin for Red (both RGB and Red LED)
const int greenLEDPin = 10;      // PWM pin for Green (both RGB and Green LED)
const int blueLEDPin = 11;       // PWM pin for Blue (both RGB and Blue LED)

// Variables to store color values
int redValue = 0;
int greenValue = 0;
int blueValue = 0;

// Timing variables for millis-based delay
unsigned long previousMillis = 0;
const long interval = 10; // Interval for updating LED values

void setup() {
  // Set LED pins as outputs
  pinMode(redLEDPin, OUTPUT);
  pinMode(greenLEDPin, OUTPUT);
  pinMode(blueLEDPin, OUTPUT);
}

void loop() {
  // Check if the time interval has passed
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    // Read analog inputs
    int joystickXValue = analogRead(joystickXPin);        // Read X-axis value
    int joystickYValue = analogRead(joystickYPin);        // Read Y-axis value
    int potentiometerValue = analogRead(potentiometerPin); // Read potentiometer value

    // Map the analog values (0-1023) to PWM values (0-255)
    redValue = map(joystickXValue, 0, 1023, 0, 255);
    greenValue = map(joystickYValue, 0, 1023, 0, 255);
    blueValue = map(potentiometerValue, 0, 1023, 0, 255);

    // Set PWM values to RGB LED and individual LEDs
    analogWrite(redLEDPin, redValue);     // Red LED intensity
    analogWrite(greenLEDPin, greenValue); // Green LED intensity
    analogWrite(blueLEDPin, blueValue);   // Blue LED intensity
  }
}