Print a Serial Message When You Press a Button

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.


/* "Print" a message on the serial monitor when the button is pressed Don't forget to hit the 'monitor' button on the code editor - right next to the board dropdown menu - to see the serial monitor after you've uploaded your code. */ void setup() { Serial.begin(9600); pinMode(8,INPUT_PULLUP); //button } void loop() { if(digitalRead(8)==LOW){ //if button 8 is pressed... Serial.println("I'm Pressed!"); //print the message on a new line } } // (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 button is on port 8, not port 6 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?