Mix Colors of Buzz's Eye with Buttons

Code

The code in the editor below is ready to run! Plug Buzz in to your computer's USB port with the cable and hit 'Upload Your Code!' to see what it does. Change something in the code, like a delay or pin number. Try to add something new to the program - it's yours to tinker with! You can always press the 'Restore' button to return the code to the working example.

/* Set up 3 buttons to correspond to each color from one of Buzz's RGB LED eyes Pressing any single button shows one color. Pressing multiple buttons mixes colors! */ void setup() { pinMode(11,INPUT_PULLUP); //button pinMode(12,INPUT_PULLUP); //button pinMode(13,INPUT_PULLUP); //button pinMode(3,OUTPUT); //one leg of the RGB LED pinMode(4,OUTPUT); //one leg of the RGB LED pinMode(5,OUTPUT); //one leg of the RGB LED } void loop() { if(digitalRead(11)==LOW){ //if button 11 is pressed... digitalWrite(3,HIGH); //turn on LED color 3 } else{ //otherwise, if button 11 is not pressed... digitalWrite(3,LOW); //turn off pin 3 } if(digitalRead(12)==LOW){ //if button 12 is pressed... digitalWrite(4,HIGH); //LED color 4 is on } else{ //otherwise.... digitalWrite(4,LOW); //pin 4 is off } if(digitalRead(13)==LOW){ //if button 13 is pressed... digitalWrite(5,HIGH); //LED 5 is on } else{ //otherwise.... digitalWrite(5,LOW); //pin 5 is off } } // (c) 2023 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 color. Don’t forget to update your code comments too!

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 Buzz's eye.

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 .

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