3_12 Twist Knob to Light the Rainbow

Twist Knob to Light the Rainbow

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 as a "switch" to turn on and off Code Lab Mini's rainbow pixels */ #include "LEDStrip.h" //The LEDStrip.h library gives your code access to special functions LEDStrip rainbow = LEDStrip(15, 13, A5); //Set up the strip by defining how many pixels (15) and how the pixels are connected to Code Lab Mini (always 13 and A5) void setup() { pinMode(A0,INPUT); //Turn Knob } void loop() { if(digitalRead(A0)==HIGH){ //If the turn knob reading is HIGH (knob turned more than half way) rainbow.setPixel(rainbow.All, 150); //set all of the pixels to your color of choice (0-299) rainbow.draw(); //Send the setPixel values to the rainbow } else{ //otherwise (if the knob is not twisted more than 1/2 way)... rainbow.clear(); //clear the LED pixels rainbow.draw(); //send the .clear() function with the .draw function } } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

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Success!

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 rainbow when it turns on.

Delete or comment out the 'else' statement. Before you upload, predict what will happen when you do this. To 'comment out' a section, place a */ in front of the first code you want to remove, and a */ after the last code you want to remove. This means the code will turn green and not run, but it's there if you want to add it back in without typing it again.