Mix Colors of the Red-Green-Blue LED with Buttons

Use the ‘Parts List’ image along with the component cards in your box to correctly plug in the electronic hardware to your Maker Board. The colorful dots next to the legs of the components match up to the ports where that leg should go on Maker Board’s ports.

Code

The code in the editor below is ready to run! Plug in the electronic components just like the Parts List card above, connect Maker Board to your computer's USB port with the cable, and hit 'Upload Your Code!'. Tinker with the code and change something! If you get stuck, you can hit the 'Restore' button to make the code go back to the working example.

/* Set up 3 buttons to correspond to each color from the RGB LED Pressing any single button shows one color. Pressing multiple buttons mixes colors! */ void setup() { pinMode(2,INPUT_PULLUP); //button pinMode(5,INPUT_PULLUP); //button pinMode(8,INPUT_PULLUP); //button pinMode(11,OUTPUT); //one leg of the RGB LED pinMode(12,OUTPUT); //one leg of the RGB LED pinMode(13,OUTPUT); //one leg of the RGB LED } void loop() { if(digitalRead(2)==LOW){ //if button 2 is pressed... digitalWrite(11,HIGH); //turn on the LED color on port 11 } else{ //otherwise, if button 2 is not pressed... digitalWrite(11,LOW); //turn off port 11 } if(digitalRead(5)==LOW){ //if button 5 is pressed... digitalWrite(12,HIGH); //port 12 is on } else{ //otherwise.... digitalWrite(12,LOW); //port 12 is off } if(digitalRead(8)==LOW){ //if button 8 is pressed... digitalWrite(13,HIGH); //port 13 is on } else{ //otherwise.... digitalWrite(13,LOW); //port 13 is off } } // (c) 2019 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

Walkthrough Video

Watch the video for a line-by-line explanation of how the example program works. Then you'll be ready to make some changes of your own!

Challenges

Can you complete the challenges? Change the code in your code editor above. Upload your code to see the effect when you're finished. Complete a challenge? Check it off the list!

Rearrange which button turns on which LED. Don’t forget to update your code comments too!

Add another RGB LED so that each button turns on 2 ports - one color from each LED.

Modify the if-else statements so that all of the colors of the LED are on until you press a button. Each button should turn off one color of the RGB LED.

Concepts

These are the new code concepts covered in this example program. To become a great coder, read through these concepts to learn new vocabulary.

Quiz

If you're having trouble, try to run an experimental program or look at the example code to help you find the answer.

1. Which syntax ends the entire 'void loop' function?

semicolon ;
parentheses )
closing curly brace }

2. Which syntax ends a single code command?

semicolon ;
closing curly brace }
period .

Back to Projects Grid