1_9 RGB Color Mixer

Red-Green-Blue LED Color Mixer

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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Monitor Upload Your Code!

/* Power multiple legs of the multicolor (RGB) LED light on and off to create blended colors */ void setup(){ pinMode(9,OUTPUT); //set the multicolor LED to OUTPUT pinMode(10,OUTPUT); pinMode(11,OUTPUT); } void loop(){ digitalWrite(9,HIGH); //turn on the LED color connected to pin 9 delay(1000); //Wait 1000 milliseconds (1 second) with only one color on. digitalWrite(10,HIGH); //turn on a second color using pin 10 delay(1000); //Wait 1000 milliseconds digitalWrite(11,HIGH); //turn on a third color using pin 11 delay(1000); //Wait 1000 milliseconds digitalWrite(9,LOW); //turn off the first color on pin 9 delay(1000); //Wait 1000 milliseconds digitalWrite(10,LOW); //turn off the second color on pin 10 delay(1000); //Wait 1000 milliseconds digitalWrite(11,LOW); //turn off the third color on pin 11 delay(1000); //Wait 1000 milliseconds before starting the loop over } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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!

Change the delays between the digitalWrite( ) functions to speed up or slow down how quickly the colors mix.

Which two colors are never on at the same time? Write or rearrange some code so that you can see those two colors mix!

1_8 analogWrite Motor Strength

analogWrite Motor Buzz Strength

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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

// Set the strength of the motor's buzz to three different levels void setup(){ pinMode(3,OUTPUT);//Set pin 3 to receive power } void loop(){ analogWrite(3,80); //Set motor strength to 80. It can range from 0-255 delay(1000); //Wait 1000 milliseconds (1 second) at strength 80 analogWrite(3,160); //Set strength to 160, double the last function delay(1000); //Wait 1000 milliseconds analogWrite(3,240); //Set strength almost to maximum delay(1000); //Wait 1000 milliseconds before restarting the loop } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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 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!

Change the speed of the delays inside the void loop function so the motor speed rises twice as fast.

Add more analogWrite( ) functions and delay functions to make the motor rise more smoothly and gradually.

Change the second argument in the analogWrite functions so the motor isn't "revving up", but instead its power is jumping all over the place. The more analogWrite functions you have, the more random this will seem!

1_7 analogWrite Brightness

analogWrite the Brightness of 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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Monitor Upload Your Code!

/* Change the brightness of an LED to three different levels Only LED colors 9, 10, and 11 can use the analogWrite() function used here. */ void setup(){ pinMode(9,OUTPUT); //Set LED 9 to receive power } void loop(){ analogWrite(9,80); //Set brightness to 80. Brightness can range from 0-255 delay(1000); //Wait 1000 milliseconds (1 second) at brightness 80 analogWrite(9,80); //Set brightness to 160, double the last function. delay(1000); //Wait 1000 milliseconds analogWrite(9,80); //Set brightness almost to maximum delay(1000); //Wait 1000 milliseconds before restarting the loop } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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 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!

Change the speed of the delays inside the void loop function. How fast can the loop run before you can't see the different brightness levels at all?

Add more analogWrite( ) functions and delay functions to make the brightness fade more smoothly and gradually.

Add another LED that is being 'faded up'. Remember LEDs 9,10, and 11 are the only ones that can use the analogWrite function.

Rearrange the functions so that the loop fades the LED down instead of up.

1_6_1 Alternate LED Blinks Bug

Bug Hunt! Test your Troubleshooting.

Prefer listening over reading? Click the play button in the audio bar.

Here’s how Bug Hunts work:

We’ve taken the example code from the last project and inserted errors into it. These errors might be spelling problems, syntax, or we might have changed up how the program works altogether!

The goal of the Bug Hunt is to find and fix the errors so that when you upload the code, it runs just like the example code did on the project page.

Try these steps in order to solve a Bug Hunt:

1) Look over the code closely first, looking for anything that is out of place. We recommend you do this first to build up your ‘bug hunting instincts’.

2) Press ‘Upload the Code’ with your board plugged in and the circuit built. The code won’t work, but it will show you the errors that the computer found - these will pop up in a box just below the code editor. These clues are sometimes vague or confusing, but they may help you find out where the problem is.

3) Check your code references, especially for the functions that have turned red when you hit “Upload”. Compare the syntax of your reference book to the syntax in your code editor here.

After you’ve fixed the bug and the code is working again, hit ‘Restore’ so you can see the code how it was before you fixed it. Is the bug obvious to you now? Reviewing like this will make it easier to find bugs in future programs!

Get stuck? Click on ‘Need a Hint?’ below. It will provide a clue about what’s wrong in this program.

Restore 12 14 18 24 30

Monitor Upload Your Code

/* Buggy: Blink two LEDs back and forth */ void setup(){ pinMode(8,OUTPUT); //Set LED 8 to receive power pinMode(12,OUTPUT); //Set LED 12 to receive power } void loop(){ digitalWrite(8,high);// turn on pin 8 digitalWrite(12,LOW);//turn off pin 12 delay(1000);//delay 1000 milliseconds (1 second) digitalWrite(8,low);//turn off pin 8 digitalWrite(12,HIGH);//turn on pin 12 delay(1000);//wait 1000 millisecond before restarting the loop } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

Heads up! You need our Chrome App to run this code. Install the App

Success!

Compile errors:

Serial port monitor: Input: Send Close

 

Need a Hint? Click Here.

Check the capitalization of the words. Most code follows very strict rules about which words or letters are capitalized, and the computer won't recognize a command that isn't capitalized correctly!

Most commonly used keywords in code get highlighted to a new color when they are entered correctly. You can scan over the code with your eyes to see if anything sticks out that isn't highlighted.

1_6 Alternate LED Blinks

Alternate LED Blinks

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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Blink two LEDs back and forth */ void setup(){ pinMode(8,OUTPUT); //Set LED 8 to receive power pinMode(12,OUTPUT); //Set LED 12 to receive power } void loop(){ digitalWrite(8,HIGH);// turn on port 2 digitalWrite(12,LOW);//turn off port 6 delay(1000);//delay 1000 milliseconds (1 second) digitalWrite(8,LOW);//turn off port 2 digitalWrite(12,HIGH);//turn on port 6 delay(1000);//wait 1000 millisecond before restarting the loop } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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!

Update the delays in the program. How small can you make them before it's impossible to know which LED is on?

Add a third LED pin that blinks at the same time as LED 8 blinks. Don't forget the pinMode() function!

Add a third LED pin that blinks separately from the other two, so that it is on when the other two are off.

1_5 Serial Print a Message

Serial Print a Message

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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Display a message on the serial monitor when the loop ends*/ void setup(){ Serial.begin(9600); //Start serial monitor with speed 9600. Don't change the 9600 } void loop(){ delay(1000); //Wait 1000 milliseconds (1 second) with the code 'paused' Serial.println("Loop Ends!"); //print the message 'loop ends' on a new line each time } //Don't forget to open the monitor by clicking 'Monitor' after uploading this code! // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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!

Change the delay in the loop so the message 'prints' faster or slower.

Update the contents of the message.

Add some code:Serial.println("Loop Begins!");
at the top of the void loop function to show a different message when the loop begins.

1_4_1 Play 3 Tones Bug Hunt

Bug Hunt! Test your Troubleshooting.

Prefer listening over reading? Click the play button in the audio bar.

Here’s how Bug Hunts work:

We’ve taken the example code from the last project and inserted errors into it. These errors might be spelling problems, syntax, or we might have changed up how the program works altogether!

The goal of the Bug Hunt is to find and fix the errors so that when you upload the code, it runs just like the example code did on the project page.

Try these steps in order to solve a Bug Hunt:

1) Look over the code closely first, looking for anything that is out of place. We recommend you do this first to build up your ‘bug hunting instincts’.

2) Press ‘Upload the Code’ with your board plugged in and the circuit built. The code won’t work, but it will show you the errors that the computer found - these will pop up in a box just below the code editor. These clues are sometimes vague or confusing, but they may help you find out where the problem is.

3) Check your code references, especially for the functions that have turned red when you hit “Upload”. Compare the syntax of your reference book to the syntax in your code editor here.

After you’ve fixed the bug and the code is working again, hit ‘Restore’ so you can see the code how it was before you fixed it. Is the bug obvious to you now? Reviewing like this will make it easier to find bugs in future programs!

Get stuck? Click on ‘Need a Hint?’ below. It will provide a clue about what’s wrong in this program.

Restore 12 14 18 24 30

Monitor Upload Your Code

/* Buggy:Play three tones on the speaker, on repeat*/ void setup(){ pinMode(2,OUTPUT); //Set the speaker as an OUTPUT } void loop(){ tone(2,500); //Play a tone of 500 hertz on pin 2 delay[1000); //Delay 1000 milliseconds (1 second) tone(2,700); //Play a tone of 700 hertz delay[1000); //Delay 1000 milliseconds tone(2,900}; //Play a tone of 900 hertz delay(1000); //Delay 1000 milliseconds before starting the loop code again } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

Heads up! You need our Chrome App to run this code. Install the App

Success!

Compile errors:

Serial port monitor: Input: Send Close

 

Need a Hint? Click Here.

Some of the syntax in code looks very similar, like the bracket [ ],the curly brace { }, and the parentheses ( ). The arguments of a function should be surrounded by parentheses!

1_4 Beep 3 Tones on the Speaker

Beep 3 Tones on the Speaker

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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Play three tones on the speaker, on repeat*/ void setup(){ pinMode(2,OUTPUT); //Set the speaker as an OUTPUT } void loop(){ tone(2,500); //Play a tone of 500 hertz on pin 2 delay(1000); //Delay 1000 milliseconds (1 second) tone(2,700); //Play a tone of 700 hertz delay(1000); //Delay 1000 milliseconds tone(2,900); //Play a tone of 900 hertz delay(1000); //Delay 1000 milliseconds before starting the loop code again } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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!

Change the argument inside each delay function to make the tones play faster or slower. What's the fastest you can play the three tones and still hear each one?

Play a fourth tone that plays for 1000 milliseconds.

Stop the tones at the end of the loop and delay 5000 milliseconds before the loop starts over. Hint: You'll need to use the noTone( ) function.

1_3 Blink Two Synced LEDs

Blink 2 Synced LED Lights

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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Blink two LEDs in sync */ void setup(){ pinMode(8,OUTPUT); //Set pin 8 to receive power pinMode(12,OUTPUT); //Set pin 12 to receive power } void loop(){ digitalWrite(8,HIGH);// turn on LED 8 digitalWrite(12,HIGH);//turn on LED 12 delay(1000);//delay 1000 milliseconds (1 second) digitalWrite(8,LOW);//turn off LED 8 digitalWrite(12,LOW);//turn off LED 12 delay(1000);//wait 1000 milliseconds before restarting the loop } //(c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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!

Update the delay function values in the code to change how fast or slow the LEDs blink.

Change the line pinMode(12,OUTPUT); to pinMode(12,INPUT);. What difference do you now see between the two LEDs?

Try to make the LEDs alternate so that one is on while the other is off. Hint: You need to make a change to two digitalWrite( ) functions.

1_3_1 Blink 2 Synced LEDs Bug Hunt

Bug Hunt! Test your Troubleshooting.

Prefer listening over reading? Click the play button in the audio bar.

Here’s how Bug Hunts work:

We’ve taken the example code from the last project and inserted errors into it. These errors might be spelling problems, syntax, or we might have changed up how the program works altogether!

The goal of the Bug Hunt is to find and fix the errors so that when you upload the code, it runs just like the example code did on the project page.

Try these steps in order to solve a Bug Hunt:

1) Look over the code closely first, looking for anything that is out of place. We recommend you do this first to build up your ‘bug hunting instincts’.

2) Press ‘Upload the Code’ with your board plugged in and the circuit built. The code won’t work, but it will show you the errors that the computer found - these will pop up in a box just below the code editor. These clues are sometimes vague or confusing, but they may help you find out where the problem is.

3) Check your code references, especially for the functions that have turned red when you hit “Upload”. Compare the syntax of your reference book to the syntax in your code editor here.

After you’ve fixed the bug and the code is working again, hit ‘Restore’ so you can see the code how it was before you fixed it. Is the bug obvious to you now? Reviewing like this will make it easier to find bugs in future programs!

Get stuck? Click on ‘Need a Hint?’ below. It will provide a clue about what’s wrong in this program.

Restore 12 14 18 24 30

Monitor Upload Your Code

/* Buggy: Blink two LEDs in sync */ void setup(){ pinMode(8,OUTPUT); //Set pin 8 to receive power pinMode(12,OUTPUT); //Set pin 12 to receive power } void loop(){ digitalWrite(8,HIGH); // turn on LED 8 digitalWrite(12,HIGH) //turn on LED 12 delay(1000); //delay 1000 milliseconds (1 second) digitalWrite(8,LOW) //turn off LED 8 digitalWrite(12,LOW); //turn off LED 12 delay(1000);//wait 1000 milliseconds before restarting the loop } //(c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

Heads up! You need our Chrome App to run this code. Install the App

Success!

Compile errors:

Serial port monitor: Input: Send Close

 

Need a Hint? Click Here.

Functions end with a semicolon ( ; ). If one is missing, you'll have problems!

1_2 Buzz the Motor

Buzz the Vibration Motor

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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Buzz Code Lab Mini's motor on and off once per second */ void setup(){ pinMode(3,OUTPUT); //Set the motor as an output } void loop(){ digitalWrite(3,HIGH); //Turn on pin 3 delay(1000); //Wait 1000 milliseconds (1 second) digitalWrite(3,LOW); //Turn off pin 3 delay(1000); //Wait 1000 milliseconds before restarting the loop code } //(c)2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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!

Change the number inside the delay function. How small does the delay have to be before it feels like the motor is constantly on?

What delay would make the motor be on for 10 times as long as it is off each loop?

Make sure you update the green code comments to describe what you're doing if you've tried the first 2 challenges - it's a good habit to start!

1_1 Single Beep the Speaker

Single Speaker Beep

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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Beep a tone one time. Unplug and replug your power cable to hear it again! */ void setup(){ pinMode(2,OUTPUT); //Set pin 2 to receive power tone(2,400); //Send a tone of 400 hertz (hz) to the speaker delay(1000); //Delay 1000 milliseconds (1 second) with the tone playing noTone(2); //Turn off any tones playing } void loop(){} //Nothing in the loop, so no code will repeat // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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!

Update the delay for your beep. What's the smallest delay where you can still hear the tone?

Change the second number inside the tone( ) function to play a different pitch on the speaker. Don't forget to upload the code to hear it beep!

Add two slashes (//) to the left of the line of code that has the noTone( ) function to see what happens.

1_0_1 Blink Bug Hunt

Blink Bug Hunt! Test your Troubleshooting.

Prefer listening over reading? Click the play button in the audio bar.

Here’s how Bug Hunts work:

We’ve taken the example code from the last project (in this case, Blink) and inserted errors into it. These errors might be spelling problems, syntax, or we might have changed up how the program works altogether!

The goal of the Bug Hunt is to find and fix the errors so that when you upload the code, it runs just like the example code did on the project page.

Try these steps in order to solve a Bug Hunt:

1) Look over the code closely first, looking for anything that is out of place. We recommend you do this first to build up your ‘bug hunting instincts’.

2) Press ‘Upload the Code’ with your board plugged in and the circuit built. The code won’t work, but it will show you the errors that the computer found - these will pop up in a box just below the code editor. These clues are sometimes vague or confusing, but they may help you find out where the problem is.

3) Check your code references, especially for the functions that have turned red when you hit “Upload”. Compare the syntax of your reference book to the syntax in your code editor here.

After you’ve fixed the bug and the code is working again, hit ‘Restore’ so you can see the code how it was before you fixed it. Is the bug obvious to you now? Reviewing like this will make it easier to find bugs in future programs!

Get stuck? Click on ‘Need a Hint?’ below. It will provide a clue about what’s wrong in this program.

Restore 12 14 18 24 30

Monitor Upload Your Code

/* Buggy: Blink LED 8 on and off */ void setup(){ pinMode(8,OUTPUT); //Set LED 8 to receive power } void loop(){ digitalWrite(8,HIGH); //Turn on LED 8 delay(1000); //Wait 1000 milliseconds (1 second) digitalWRITE(8,LOW); //Turn off pin 8 delay(1000); //Wait 1000 milliseconds before restarting the loop code } //(c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

Heads up! You need our Chrome App to run this code. Install the App

Success!

Compile errors:

Serial port monitor: Input: Send Close

 

Need a Hint? Click Here.

Check the capitalization of the words. Most code follows very strict rules about which words or letters are capitalized, and the computer won't recognize a command that isn't capitalized correctly!

1_0 Blink an LED Light

Blink an LED Light

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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Blink LED 8 on and off */ void setup(){ pinMode(8,OUTPUT); //Set pin 8 to receive power } void loop(){ digitalWrite(8,HIGH); //Turn on LED 8 delay(1000); //Wait 1000 milliseconds (1 second) digitalWrite(8,LOW); //Turn off LED 8 delay(1000); //Wait 1000 milliseconds before restarting the loop code } //(c)2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

It looks like your computer isn't set up to code yet. Setup My Computer

Success!

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!

Change the number inside the delay function from 1000 to 100. What is the fastest delay that you can still see the LED blink?

Make the value inside the 'delay' function as small as you can while still seeing the LED blink. How small does the delay need to be for the LED to stop flickering?

Change the 'port' argument of the pinMode function and both digitalWrite functions to '3'.