RGB LED color mixing in Raspberry Pi - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does RGB stand for in RGB LED color mixing?

RGB stands for Red, Green, and Blue. These are the three colors combined in different amounts to create many colors.

beginner

How do you create the color yellow using an RGB LED?

To make yellow, turn on the Red and Green LEDs together with full brightness, and keep Blue off.

intermediate

Why do we use PWM (Pulse Width Modulation) when controlling RGB LEDs on Raspberry Pi?

PWM lets us control the brightness of each color by turning the LED on and off very fast, making it look dimmer or brighter.

beginner

What happens if you set all three colors (Red, Green, Blue) to full brightness on an RGB LED?

The LED will show white light because mixing all three colors at full brightness creates white.

beginner

In Raspberry Pi programming, which library is commonly used to control GPIO pins for RGB LEDs?

The RPi.GPIO library is commonly used to control GPIO pins on Raspberry Pi for RGB LED color mixing.

Which two colors do you mix to get cyan on an RGB LED?

A Red, Green, and Blue

B Red and Blue

C Red and Green

D Green and Blue

Cyan is made by mixing Green and Blue light.

What does PWM control when used with RGB LEDs on Raspberry Pi?

A The brightness of each color

B The color temperature

C The power supply voltage

D The LED size

PWM controls how bright each color LED appears by adjusting the on/off timing.

If you want to make purple using an RGB LED, which colors should you mix?

A Red and Green

B Red and Blue

C Green and Blue

D All three colors

Purple is made by mixing Red and Blue light.

Which Raspberry Pi pin type is used to control an RGB LED?

A Ground pins only

B Power pins only

C GPIO pins

D Audio pins

GPIO pins are used to send signals to control the RGB LED.

What color results from turning off all three RGB LED colors?

A Black (LED off)

B White

C Yellow

D Purple

Turning off all colors means no light, so the LED appears black or off.

Explain how you can mix colors using an RGB LED on a Raspberry Pi.

Think about how turning on different LEDs at different brightness levels changes the color.

Describe the role of GPIO pins and PWM in controlling an RGB LED on Raspberry Pi.

Consider how the Raspberry Pi talks to the LED and changes its light.