Blinking multiple LEDs using switch case

Blinking multiple LEDs using switch case
Blinking multiple LEDs using switch case

Blinking multiple LEDs using switch case You have breadboard, LEDs, and Arduino. Now what? Make those LEDs blink stylishly. Switch case statements expand LED creativity. With a few lines of code, you can create stunning flickering light patterns. Want them to flash sequentially, randomly, or sync? No issue. Make LED masterpieces to impress your friends. This article covers basic to expert LED army command. Bring out your blink brilliance. Your imagination is the only limit with switch case. Start blinking.

Understanding Blinking LEDs

Want to start blinking LEDs? Great! Flashing LEDs is a fun method to learn microcontroller programming and build simple circuits.

What You Need

You’ll need these basics to begin:

A microcontroller board like Arduino

Your choice of color LEDs


Jumper cables

Prototyping breadboard

Connecting the Circuit

You must first connect your LED to the Arduino. Put the LED’s shorter, negative leg on a ground (GND) pin on the Arduino and its longer, positive leg on a digital pin (pin 13). Put a resistor between the digital pin and positive leg. The resistor restricts LED current to prevent burning.Connect the ground pin to Arduino’s ground and the digital pin to pin 13. Make sure your LED’s legs are in the right pins before programming your Arduino!

Writing Code

Turning an LED on and off repeatedly with digitalWrite() blinks it. Enter this code in Arduino IDE:

LED on pin 13

setup() { pinMode(ledPin, OUTPUT); // Set pin as output

void loop() { digitalWrite(ledPin, HIGH); delay(1000); // LED on

This code blinks the LED every second. Upload it to Arduino and see the LED blink!

Adjusting delay times lets you speed up, slow down, or create blinking patterns. Add more LEDs and use the switch case statement to alternately blink them. Endless possibilities! Enjoy your blinking LED circuits.

Switch Case Statement Fundamentals

Switch case statements let you control program flow based on variable or expression values. Implementing numerous conditional tests without a “if-else if” ladder is clean.

You require an integer or char expression to use a switch case. Place this in parenthesis after switch. The case labels must be constant expressions like numbers or characters. Execute the switch expression-matching code block.

As an example:

‘B’char grade;

change grade { case ‘A’: printf(“Excellent!”); break; case ‘B’: printf(“Good job!”); break; case ‘C’: printf(“You passed.”); break; default: printf(“Invalid grade.”); }

The switch expression is ‘B’ for char grade. The case ‘B’: block prints “Good job!”. Break leaves the switch block. The software would continue to the next case without stopping.

Optional default case executes if no case label matches switch expression. No input will be unmatched.

Example: Multiple cases with the same code block:

switches (n) { case 1: case 2: case 3: printf(“n is 1, 2 or 3”); break;

This helps when handling multiple cases the same way. Switch cases make complex conditional logic clean and accessible. Have fun and be creative with LED blinking!

Creative Single-LED Blinking

Many DIY projects may employ fun LEDs. Simple Arduino projects include blinking an LED at varying rates. You can fully regulate LED blinking. Here are some unique LED blinking methods.

Morse Code

Your Arduino can blink the LED in Morse code using dot and dash sequences for letters and numerals. S is three short blinks, and C is two lengthy blinks followed by two short blinks. Using an LED to deliver secret messages is entertaining.

Random Blinking

For unpredictable blinking, have your Arduino determine a random time delay between blinks. After generating a random number between 200 and 2000 milliseconds, use delay() to pause before blinking the LED again. Your LED will blink wildly, confusing you.

Fade In/Out

PWM lets you fade the LED instead of turning it on and off. Start with 0 brightness and increase it slightly on each cycle until it reaches maximum brightness. Each loop’s brightness should be reduced till off. The LED will fade in and out creating a cool look.

Music Blink

Using the serial connection, you can program your Arduino to blink the LED to computer music. Blink the Arduino LED on each beat or downbeat. You must determine the song’s beats per minute and how often to blink the LED to match it. Your own LED equalizer!

Creatively, you can make an ordinary LED perform amazing things. Use varied blinking patterns to make distinctive LED displays and light shows. Endless possibilities!

Advanced Multi-LED Techniques

After learning to blink a single LED, you can advance. Multiple LEDs can be controlled separately to produce more sophisticated patterns and effects. Try these techniques:

Multiple LEDs fade

To fade several LEDs, utilize pulse width modulation (PWM) to adjust their brightness. To alter brightness, swiftly flip the LED on and off and vary the on/off ratio.

You may fade two LEDs like this:

Int led1PWM = 0; int led2PWM = 0;

void loop() { led1PWM = led1PWM + 5; boost brightness
led2PWM – 5; // Reduce brightness

Call analogWrite(led1, led1PWM); call analogWrite(led2, led2PWM);

delay(30); // Delay between brightness changes

This fades LED 1 on and LED 2 off, giving a cool alternating effect.

Chase Lights

Creating a “chase light” pattern by turning on LEDs one by one is a popular effect. Keep a counter to track which LED should be on and turn it on while turning the preceding one off.

As an example:

int counter=0;

void loop() { digitalWrite(counter, HIGH); // On current LED digitalWrite(counter – 1, LOW); // Off previous LED

Counter++; // Move to next LED if (counter == 4) counter = 0; // Strip end reset

delay(100); // Chase light speed

This loops endlessly by chasing a strip of 4 LEDs and returning to the start.

Arduino code can generate amusing lighting effects by mixing numerous LEDs, PWM, and programming logic. Endless possibilities! Let your imagination lead you to exciting tasks.


Here are some amusing switch case-based LED blinking patterns. These projects increase your Arduino and electronics skills, whether you’re a beginner or an expert. I love that they don’t require many parts, so you can attempt them yourself. You might even be inspired to create your own LED blinking designs. Be careful with electricity and enjoy learning via constructing. Arduino’s potential are infinite! Get your kit, breadboard, and LEDs and experiment today. When you let your maker side shine, you’ll make cool things.

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