6_4 Toggle LED Rainbow On and Off

Toggle LED Rainbow On and Off

Code

The code in the editor below is ready to run! Plug Code Lab Mini in to your computer's USB port, make sure that your Code Lab Mini Rainbow Add-On (sold separately) is attached, 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.

If you haven't set up your Code Lab Mini Rainbow Add-On yet, visit Chapter 0 to watch a video showing you how to do that.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Use a button to latch all of Code Lab Mini's rainbow pixels on or off */ #include "LEDStrip.h" //The LEDStrip.h library gives your code access to special functions exclusive to the LED Pixels LEDStrip rainbow = LEDStrip(15, 13, A5); //Set up the rainbow by defining how many pixels (15) and where it's connected to Code Lab Mini (always 13 and A5) int pressCount = 0; //Create a variable called 'pressCount' that is an integer (whole number) and starting value of 0 void setup() { pinMode(6,INPUT_PULLUP); //button } void loop() { if(digitalRead(6)==LOW){ //if button 6 is pressed pressCount++; //increase the value of pressCount by 1 delay(250); //delay long enough to release the button before a press is counted twice } if(pressCount==1){ rainbow.setPixel(rainbow.ALL,100); //set the entire pixel to a color value of 100 rainbow.draw(); //send the setPixel data to be displayed on the rainbow } else{ rainbow.clear(); //clear the entire rainbow so there are no colors displayed rainbow.draw(); //send the 'clear' command to the rainbow pressCount = 0; //reset the pressCount variable to 0 } } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

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Compile errors:

Serial port monitor: Input: Send Close

 

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!

LED Pixel Color Spectrum

Use this spectrum to estimate the color values you'll need for your 'setPixel' arguments to achieve your favorite color!

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!

Change the color of the LED pixels by changing the second argument in the setPixel function.

Change the first argument of the setPixel function so that only one LED pixel comes on when the button is pressed.

After you’ve changed the code so only one LED pixel comes on when the button is pressed, add another setPixel function just below the first setPixel function - you’ll have to go to the end of the line of code, past the comment, and press enter. Then, type a new setPixel function so that another pixel comes on with a different color when you press the button. You can continue this so that pressing the button turns all of the pixels on a different color when the button is pressed!