7_13 Turn Knob Rainbow Brightness

Turn Knob 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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Use the turn knob to control the brightness of Code Lab Mini's LED pixel rainbow */ #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() { pinMode(A0,INPUT); //turn knob } void loop() { int brightness = analogRead(A0)/10 ; //Create a variable called 'brightness' that is an integer (whole number) //The brightness variable value takes the reading from the turn knob and divides it by 10, so it has a range of 0 to 102 rainbow.setPixel(rainbow.ALL,200,brightness); //set all pixels to a color value of 200 and a brightness value of 'brightness' variable. rainbow.draw(); //send the setPixel data to the pixels } // (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 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!

Change the color of the pixels that light up on the rainbow by changing the second argument of the setPixel function.

Reduce the brighness range so that turning the knob all the way only gets the pixels to 50% brightness.

Change the color of the pixels from 200 to a random value between 0 and 300. Before you upload, what do you think will happen? Notice that there are no delays in this program!