Display a Button and LED Status on the Serial Monitor

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.


/* Serial.print the status of a button and an LED so you can see how the computer 'sees' the component statuses (0 or 1). */ void setup() { pinMode(8,INPUT_PULLUP); //button will send a LOW (0) signal when pressed pinMode(2,OUTPUT); //LED light Serial.begin(9600); //set the serial port up to receive data } void loop() { digitalWrite(2,digitalRead(8)); //Use the value from the digitalRead of the button as the value for digitalWrite for the LED Serial.print("Button Status: "); //Use serial.print to label the data in the monitor. Serial.println(digitalRead(8)); //Use serial.println to show the data and start a new line in the monitor Serial.print("LED Status: "); //Use serial.print to label the data in the monitor. Serial.println(digitalRead(2)); //Use serial.println to show the data and start a new line in the monitor delay(500); //Delay 500 milliseconds so the data doesn't stream by too fast. //Note that adding a delay will make the button less responsive to your touch. } // (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 connected to 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

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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?