Clapper LED 'Blip'

Code

The code in the editor below is ready to run! Plug your Code Lab 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.


/* Turn on an LED light when the sound trigger 'hears' a sound. You can change the threshold where the light turns on by changing the number in the 'if' statement The sound trigger has a range of 0-1023. Lightly tap it to see if it's working */ void setup(){ pinMode(A3,INPUT); //sound trigger pinMode(2,OUTPUT); //LED light } void loop(){ if(analogRead(A3) > 700){ //if the sound level spikes above the threshold of 700 digitalWrite(2,HIGH); //turn on LED 2 } else{ //otherwise if the sound is lower than the threshold you set digitalWrite(2,LOW); //turn off LED 2 } } // (c) 2021 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!

Video Notes for Code Lab Users:

  • Your sound sensor is on port A3, not A1 as the video says.

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!

Concepts

These are the new code concepts covered in this example program. To become a great coder, read through these concepts to learn new vocabulary.

Quiz

If you're having trouble, try to run an experimental program or look at the example code to help you find the answer.

1. Which syntax ends the entire 'void loop' function?




2. Which syntax ends a single code command?