9_12 Rainbow Brightness Fade

Rainbow Brightness Fade

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!

//Fade all of Code Lab Mini's LED pixels up and down in brightness, changing to a random color each 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) void setup() {} void loop() { int color = random(0,300); //select a random color to display each time the loop runs /* Create a variable i that has a starting value of 0 and, as long as i is less than 100, run the code between the curly braces, then increase the value of the 'i' variable by 1*/ for(int i = 0; i < 100; i++){ rainbow.setPixel(rainbow.ALL,color,i); //Set all of the pixels to the color variable value with brightness "i" rainbow.draw(); //send the setPixel data to the rainbow delay(50); //delay 50 milliseconds (0.05 second) before running the 'for' loop again } /* Create a variable i that has a starting value of 100 and, as long as i is greater than 0, run the code between the curly braces, then decrease the value of the 'i' variable by 1*/ for(int i = 100; i >=0; i--){ rainbow.setPixel(rainbow.ALL,color,i); //Set all of the pixels to the color variable value with brightness "i" rainbow.draw(); //send the setPixel data to the rainbow delay(50); //delay 50 milliseconds (0.05 second) before running the 'for' loop again } } // (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 that fade up and down to a single color for every fade.

Change the delays to change the speed of the fade.

Add a speaker to this circuit and to this program. Make it play a hertz value of ‘i*5’ inside both ‘for’ loops so that the tone fades up and down with the brightness of the LED strip. This is a tough challenge!