7_10 Turn Knob LED Brightness

Turn Knob LED Brightness

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 control the brightness of an LED */ void setup() { pinMode(A0,INPUT); //turn knob pinMode(9,OUTPUT); //LED } void loop() { int brightness = analogRead(A0)/4 ; //Create a variable called 'brightness' that is an integer (whole number) //The brightness variable value takes the reading from the turn knob and divides it by 4, so it has a range of 0 to 255 //analogWrite works on pins 3,9,10, and 11 and has a range of 0-255 analogWrite(9,brightness); //set the LED's brightness equal to the value of the 'brightness' variable } // (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!

Add more LEDs to this program that fade up and down with the turn knob. Remember that only LEDs 9,10, and 11 can fade.

Add in a delay(500); after the line of code with analogWrite(9,brightness);. Try to predict how this will change the program before you upload it.