6_5 Toggle LED Rainbow Colors

Toggle LED Rainbow Colors

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 toggle Code Lab Mini's rainbow between two colors */ #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 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.setPixel(rainbow.ALL,200); //set the entire rainbow to a color value of 200 rainbow.draw(); 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!

What happens if you hold down the button? How do you think the value of the pressCount variable is changing each time the loop runs?

Change the delay value to something really small, less than 10. Now what happens when you hold down the button? Can you explain how that is happening?

Change the colors that the LED wings toggle between by changing the color value arguments in the setPixel functions.