7_5 Variable LED Pixel Count

Variable LED Pixel Count

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.


/* Use a variable to light each of Code Lab Mini's rainbow pixels one at a time */ #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 pixels by defining how many pixels (15) and where it's connected to Code Lab Mini (always 13 and A5) int pixelCount = 0; //Create a variable called 'pixelCount' that is an integer (whole number) and starting value of 0 void setup(){} void loop() { rainbow.setPixel(pixelCount,200); //set the pixel that is equal to 'pixelCount' to a color value of 200 rainbow.draw(); //send the setPixel data to the rainbow delay(1000); //Wait 1000 milliseconds (1 second) before moving to the next pixel pixelCount++; //increase pixelCount by one so the next if(pixelCount==15){ //If the pixelCount variable reaches 15 (remember, pixels are numbered 0 - 15) pixelCount=0; //reset pixelCount to 0 so the LEDs start lighting up again rainbow.clear(); //turn off the pixels that are currently lit up } } // (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!

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 challenge? 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!