6_0 LED Flashlight

LED Flashlight

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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/* Create a 'flashlight' that switches on an LED when the button is pressed, then turns off the LED when the button is pressed again */ int pressCount = 0; //An integer (whole number) variable to keep track of how many times the button is pressed void setup(){ pinMode(8,OUTPUT); //LED pinMode(4,INPUT_PULLUP); //button } void loop(){ if(digitalRead(4)==LOW){ //if button 4 is pressed pressCount++; //++ is a way to add one to a variable. Now pressCount = its former value + 1 delay(250); //a delay allows you to release your finger from the button without counting multiple presses } if(pressCount == 1){ //if pressCount equals 1.. digitalWrite(8,HIGH); //turn on the LED } else{ //if pressCount is anything other than 1... digitalWrite(8,LOW); //turn off the LED pressCount = 0; //reset the count to 0 before the loop starts again } } // (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!

Make the code turn on multiple LEDs when the button is pressed. Don’t forget to turn the LEDs off in the ‘else’ statement!

Change the delay inside the first ‘if’ statement. How small can you make the delay before it’s hard to reliably turn on and off the LED?