Turn Knob Controls Blink Delay

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.


/* Use the turn knob to control the delay between blinks of an LED */ void setup() { pinMode(A0,INPUT); //turn knob pinMode(2,OUTPUT); //LED } void loop() { int wait = analogRead(A0);//create a variable with the name 'wait' and a value equal to the turn knob reading (range of 0-1024) digitalWrite(2,HIGH); //turn on the LED in port 2 delay(wait); //delay for 'wait' amount of time. This ranges from 0-1024 milliseconds digitalWrite(2,LOW); //turn off the LED in port 2 delay(wait); //delay for 'wait' amount of time before starting the loop over again } // (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!

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!

Video Notes for Code Lab Users:

  • Your turn knob is connected to port A0, not A2 as the video says.

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!