Week 9: Digital and Analog LED Control

Concept

This week, I created a simple switch to control the lights of LEDs both digitally and in an analog way. For the digital control, I used basic switches, and for the analog control, I used a potentiometer. The potentiometer detects and measures the voltage based on how much the knob or slider is turned.

Schematic Diagram

 

Code

// Pin definitions for the RGB LED
const int redPin = 6;
const int greenPin = 5;
const int bluePin = 3;

// Analog input pins for potentiometers
const int redControl = A1;
const int greenControl = A2;
const int blueControl = A3;

void setup() {
  // Set RGB LED pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Read values from potentiometers (0-1023 range)
  int redValue = analogRead(redControl);
  int greenValue = analogRead(greenControl);
  int blueValue = analogRead(blueControl);

  // Map potentiometer values to PWM range (0-255)
  int redBrightness = map(redValue, 0, 1023, 0, 255);
  int greenBrightness = map(greenValue, 0, 1023, 0, 255);
  int blueBrightness = map(blueValue, 0, 1023, 0, 255);

  // Set the brightness of each color channel
  analogWrite(redPin, redBrightness);
  analogWrite(greenPin, greenBrightness);
  analogWrite(bluePin, blueBrightness);

  // Print the brightness values to the Serial Monitor
  Serial.print("Red:   ");
  Serial.print(redBrightness);
  Serial.print("\tGreen:   ");
  Serial.print(greenBrightness);
  Serial.print("\tBlue:   ");
  Serial.println(blueBrightness);
  
  // Short delay to make output more readable
  delay(100);
}

Video Demonstration of my design can be seen below:

Reflection for future works

I am proud of the progress I made in designing and implementing the analog and digital switch controls for the LEDs. This simple project has greatly enhanced my understanding of how these systems work. I look forward to taking on more challenging tasks, particularly those that involve further manipulation of analog signals.