7_10 Buttons Raise and Lower Rainbow Brightness

Buttons Raise and Lower Rainbow Brightness

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.


//Pressing one button raises the brightness of the LED rainbow, pressing another button lowers it #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 brightness = 0; //create a variable named 'brightness' that is an integer (whole number) and starting value of 0 void setup(){ pinMode(7,INPUT_PULLUP); //button 1 (raises brightness) pinMode(4,INPUT_PULLUP); //button 2 (lowers brightness) } void loop(){ rainbow.setPixel(rainbow.ALL,200,brightness); //set the entire rainbow to a color of 200 and a brightness that is equal to the variable. rainbow.draw(); //send the setPixel data to the rainbow if(digitalRead(7)==LOW){ //If button 7 is pressed brightness++; //increase brightness variable by 1 delay(20); //a delay means you can see the fade. Without it, the light value jumps too quickly } if(digitalRead(4)==LOW){ //If button 4 is pressed brightness--; //lower the brightness on the LED delay(20); //delay allows you to see the fade. // -- is shorthand for 'subtract one from the variable' } } // (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!