2_4 Siren

Police Siren

Code

The code in the editor below is ready to run! Plug Code Lab Mini in to your computer's USB port with the cable 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.

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// Blink 2 LEDs with alternating tones like a police siren void setup(){ pinMode(8,OUTPUT); //LED light pinMode(12,OUTPUT); //LED light pinMode(2,OUTPUT); //Speaker } void loop(){ digitalWrite(8,HIGH); //Turn on LED 8 digitalWrite(12,LOW); //Turn off LED 12 tone(2,500); //Play a tone of 500 hertz delay(1000); //Wait 1000 milliseconds (one second) digitalWrite(8,LOW); //Turn off the first LED digitalWrite(12,HIGH); //Turn on the second LED tone(2,1500); //Play a tone of 1500 hertz 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!

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!

Update the delays for a faster or slower siren. What delays make the code sound the most realistic?

Update the tones that the siren toggles between.

Make both LED lights come on when the tone plays and then both lights turn off when the tone stops.