Using Red-Green-Blue (RGB) LEDs with Arduino (Common Cathode Type)

This tutorial covers the basics of RGB LEDs, focusing on the common cathode type. It explains how to connect an RGB LED to an Arduino, set up the circuit, and program the Arduino to control the LED's colors. The tutorial also introduces pulse width modulation (PWM) for color blending and demonstrates how to use a potentiometer for dynamic color control.

What is the common cathode type of RGB LED?

• An LED with a shared negative terminal

• An LED with a shared positive terminal

• An LED with separate terminals for each color

• An LED that does not require a ground connection

Which pin on a common cathode RGB LED controls the red light?

• The leftmost pin

• The second pin from the left

• The third pin from the left

• The rightmost pin

What is the purpose of connecting the common cathode to the ground?

• To allow independent control of each color

• To increase the brightness of the LED

• To complete the circuit and allow current flow

• To provide power to the LED

What additional component is added to the circuit to allow dynamic color control?

• A resistor

• A capacitor

• A potentiometer

• A diode

In the Arduino setup, which pins are used to connect the RGB LED?

• Pins 1, 2, and 3

• Pins 10, 11, and 12

• Pins 7, 8, and 9

• Pins 3, 5, and 6

What function is used in Arduino to turn on a specific color of the LED?

• digitalWrite()

• analogRead()

• digitalRead()

• analogWrite()

What technique is used to blend colors in an RGB LED?

• Amplitude modulation

• Pulse width modulation

• Frequency modulation

• Phase modulation

How does the map function help in controlling the LED colors?

• It changes the LED's voltage range

• It increases the LED's brightness

• It converts digital signals to analog

• It compresses input values to a usable range

What is the range of values that the analogWrite function can accept?

• 0 to 1023

• 0 to 100

• 0 to 255

• 0 to 512

What happens when you adjust the potentiometer in the circuit?

• It changes the LED's color intensity

• It turns the LED on and off

• It changes the LED's color to white

• It disconnects the LED from the circuit