2_4 Rainbow Siren

Rainbow Siren

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.

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Monitor Upload Your Code!

/* Turn Code Lab Mini's siren red, then blue, while it plays a tone like a police siren */ #include "LEDStrip.h" //The LEDStrip.h library gives your code access to special functions exclusive to the LED siren LEDStrip siren = LEDStrip(15, 13, A5); //Set up the siren by defining how many pixels (15) and where they connect to the microcontroller (always A4 and A5 for Code Lab Mini) void setup() { pinMode(2,OUTPUT); //Speaker } void loop() { siren.setPixel(siren.All, 100); //use siren.All to set all the pixels one color, then set the color value (100 is red) tone(2,500); //Play a tone of 500 hertz siren.draw(); //Send the setPixel values to Code Lab Mini's siren delay(1000); //Wait 1000 milliseconds (1 second) with the tone of 500 playing siren.setPixel(siren.All, 299); //A color value of 299 is blue on the LED siren tone(2,100); //Play a tone of 100 hertz siren.draw(); //Send the setPixel values to the LED siren delay(1000); //Wait 1000 milliseconds before restarting the loop } //(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 siren colors using the setPixel( ) function.

Change the delays to change how fast the siren toggles back and forth. Which delays make the siren the most realistic? How fast can the code run and still show the siren change color?

Change the tones that the siren plays. What tone values sound the most realistic? What tone values sound like an alien siren?

Add a third siren tone and a third color that shows on the LED pixels. Hint: Look for the pattern in the code. There are different 'sections' broken up by blank lines in the void loop.