3_7 Turn Knob Digital Light Switch

Twist the Knob to Light an LED

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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//Use the turn knob to turn on and off an LED light void setup(){ pinMode(4,OUTPUT); //LED pinMode(A0,INPUT); //Turn Knob } void loop(){ if(digitalRead(A0)==HIGH){ //If the turn knob reading is HIGH (knob turned more than half way) digitalWrite(4,HIGH); //turn on the LED light } else{ digitalWrite(4,LOW); //otherwise, turn off the LED } } // (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 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!

Get at least 1 more LED color to light up when you twist the knob.

Add a speaker with the pinMode function, then use tone and noTone functions to make a tone play while the light is on, then stop when the light is off.