NodeMCU RGB LED | For Beginners

In this tutorial, I will show you what an RGB LED is and how it works.

An RGB LED is a combination of 3 LEDs: red, green, and blue. These three colors can make any color. By varying supplied voltage to the RGB LEDs, different colors are formed.

An RGB LED has 4-pin interfaces. 3 pins are for red, blue, and green. There is a common pins for all three LEDs.

An RGB LED can be two types: Common Anode: -Anode (+) pin is common Common Cathode: -(Cathode-/GND) pin is common

Hardware Required

• NodeMCU
• Breadboard
• RGB LED
• Resistor 1k
• Jumper Male to male

Schematic of circuit

Common Anode:-Anode (+) pin is common. Layout of circuit

Programming

// Mechatronicslabrpi.blogspot.com Tutorial

// Hardware: NodeMCU

int RED = 5;

int GREEN = 4;

int BLUE = 0;

void setup() {

pinMode(RED, OUTPUT);

pinMode(GREEN, OUTPUT);

pinMode(BLUE, OUTPUT);

}

void loop() {

digitalWrite(RED,HIGH);

digitalWrite(GREEN,LOW);

digitalWrite(BLUE,LOW);

delay (1000);

digitalWrite(RED,LOW);

digitalWrite(GREEN,HIGH);

digitalWrite(BLUE,LOW);

delay (1000);

digitalWrite(RED,LOW);

digitalWrite(GREEN,LOW);

digitalWrite(BLUE,HIGH);

delay (1000);

}

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Video