9_9 LEDs "Up and Back"

LEDs "Up and Back"

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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/* Turn on a row of LEDs, then turn them off in reverse order */ void setup(){ //Set up all of your LEDs pinMode(8,OUTPUT); pinMode(9,OUTPUT); pinMode(10,OUTPUT); pinMode(11,OUTPUT); pinMode(12,OUTPUT); } void loop(){ /*create a variable named i that has a starting value of 8. Until i equals 12, run the code between the curly braces, then increase the value of the 'i' variable by 1*/ for(int i=8;i<13;i++){ digitalWrite(i,HIGH);//turn on the LED whose port number is equal to 'i' delay(500); //wait 500 milliseconds (0.5 seconds) with the LED on before running the 'for' loop again } /*create a variable named i that has a starting value of 12. Until i equals 8, run the code between the curly braces, then decrease the value of the 'i' variable by 1*/ for(int i=12;i>7;i--){ digitalWrite(i,LOW); //turn off whichever LED's port number is equal to 'i' delay(500); //wait 500 milliseconds (0.5 seconds) with the LED off before running the 'for' loop 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!

Modify the delays in the code to affect the speed.

What happens if you add a delay between the two ‘for’ loops? Try to predict the outcome before you run an experiment to find out.

9_8 Blink Row of LEDs

Blink Row of LEDs

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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/* Blink on and off a row of LED lights in sequence */ void setup(){ //Set up your LEDs pinMode(8,OUTPUT); //LED pinMode(9,OUTPUT); //LED pinMode(10,OUTPUT); //LED pinMode(11,OUTPUT); //LED pinMode(12,OUTPUT); //LED } void loop(){ /*create a variable named i that has a starting value of 8. Until i equals 12, run the code between the curly braces, then increase the value of the 'i' variable by 1*/ for(int i=8;i<13;i++){ digitalWrite(i,HIGH);//turn on the LED whose port number is equal to 'i' delay(500); //wait 500 milliseconds (0.5 seconds) with the LED on digitalWrite(i,LOW); //turn off the LED whose port number is equal to 'i' delay(500); //wait 500 millisecond (0.5 seconds) with the LED off before running the 'for' loop 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!

Comment out’ the second delay by adding two forward slashes (//) to the left of the word ‘delay’. Before you upload, predict what will happen when you do this.

Change either (or both) delays to a much smaller delay.

9_7 Fade Tone Up and Back

Fade Tone Up and Back

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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/* Fade the tones on a speaker up and then back down*/ void setup(){ pinMode(2,OUTPUT); //speaker } void loop(){ /*create a 'counter' variable starting at 40 and, as long as the variable is less than 1000, run the code between the curly braces, then increase the value of the 'i' variable by 1*/ for(int i = 40; i < 1000; i++){ tone(2,i); //use the value of 'i' to set the tone playing on the speaker delay(10); //wait 10 milliseconds (0.01 seconds) before running the 'for' loop again } /*create a second 'for' loop that starts i at 1000 and decreases it by 1 until i = 41*/ for(int i = 1000; i > 40; i--){ tone(2,i); //use the value of 'i' to set the tone playing on the speaker delay(10); //wait 10 milliseconds (0.01 seconds) before running the 'for' loop 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!

Change one or both of the delays in the program.

Change the starting value of the ‘i’ variable in the first ‘for’ loop. How does that affect the siren?

Change i++ to i=i*2 and i-- to i=i/2. You may have to make longer delays if you want to hear the change in tones, since the tones you hear will only be 40,80,160,320, and 640.

9_6 Fade LED Up and Back

Fade LED Up and Back

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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/* Fade up an LED light from 0-255 brightness and then back down to 0 brightness*/ void setup(){ pinMode(9,OUTPUT); //LED on an analogWrite port. Ports 3,9,10,11 can use analogWrite } void loop(){ /*create a 'counter' variable with a starting value of 0 and, as long as the variable is less than 256, run the code between the curly braces, then increase the value of the 'i' variable by 1 */ for(int i = 0; i < 256; i++){ analogWrite(9,i); //use the value of 'i' to set the brightness of LED 9 delay(25); //wait 25 milliseconds (0.025 seconds) before running the 'for' loop again } /*create a 'counter' variable with a starting value of 255 and, as long as the variable is greater than 0, run the code between the curly braces, then decrease the 'i' variable value by 1*/ for(int i = 255; i > 0; i--){ analogWrite(9,i); //use the value of 'i' to set the brightness of LED 9 delay(25); //wait 25 milliseconds (0.025 seconds) before running the 'for' loop again } //Once the 'for' loops have ended, the void loop will start over, running the 'for' loops 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!

Change the delay in the first ‘for’ loop. Predict how this will change the fade before you upload your new code.

Now change the delays in both of the ‘for’ loops. How does that change the program?

Change the variable in the second ‘for’ loop from i to j (another common ‘counter’ variable name). Notice that the ‘i’ variable used in the first ‘for’ loop is totally different from the ‘i’ variable in the second ‘for’ loop.

9_5 Fade Motor Strength Up and Back

Fade Motor Strength Up and Back

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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/* Fade up the strength on a motor from analog write 1 to 255 and back to 1*/ void setup(){ pinMode(3,OUTPUT); //motor } void loop(){ /*create a 'counter' variable with a starting value of 0 and, as long as the variable is less than 256, run the code between the curly braces, then increase the value of the 'i' variable by 1 */ for(int i = 1; i < 256; i++){ analogWrite(3,i); //use the value of 'i' to set the strength of the motor delay(25); //wait 25 milliseconds (0.025 seconds) before running the 'for' loop again } /*create a 'counter' variable with a starting value of 255 and, as long as the variable is greater than 0, run the code between the curly braces, then decrease the 'i' variable value by 1*/ for(int i = 255; i > 0; i--){ analogWrite(3,i); //use the value of 'i' to set the strength of the motor delay(25); //wait 25 milliseconds (0.025 seconds) before running the 'for' loop again } //Once the 'for' loops have ended, the void loop will start over, running the 'for' loops 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!

Modify the delays in the code to affect the speed.

What happens if you add a delay between the two ‘for’ loops? Try to predict the outcome before you run an experiment to find out.

9_4 Fade Up Motor Strength and Print the Variable

Fade Up Motor Strength and Print the Variable

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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/* Fade up the strength of the motor and show the value of the i variable on the serial monitor*/ void setup(){ pinMode(3,OUTPUT); //motor Serial.begin(9600); } void loop(){ /*create a 'counter' variable starting at 0 and, as long as the variable is less than 256, run the code between the curly braces, then increase the value of the 'i' variable by 1 */ for(int i = 1; i < 256; i++){ analogWrite(3,i); //use the value of 'i' to determine the strength of the buzz on the motor Serial.println(i); //'print' the value of the 'i' variable on the serial monitor delay(10); //wait 10 milliseconds (0.01 seconds) before running the 'for' loop again } //Once the 'for' loop has ended, the void loop will start over, resetting the i variable and running the 'for' loop 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!

Add an 'if' statement inside the 'for' loop that will run only when i = 255. When that's true, print "max speed!" to the serial monitor. This is a tough challenge!

Add in the speaker to this program so that a tone fades up from 0 to 256 along with the motor strength.

Slow down the for loop by increasing the delay. This will also make the serial monitor much easier to read.

9_3 Fade Up Tone and Print the Variable

Fade Up Tone and Print the Variable

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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/* Fade up the tones on a speaker while 'printing' the variable value to the serial monitor*/ void setup(){ pinMode(2,OUTPUT); //speaker Serial.begin(9600); //get the serial monitor ready to receive data from your board } void loop(){ /*create a 'counter' variable starting at 40 and, as long as the variable is less than 1000, run the code between the curly braces, then increase the value of the 'i' variable by 1 */ for(int i = 40; i < 1000; i++){ tone(2,i); //use the value of 'i' to determine the tone playing on the speaker Serial.println(i); //'print' the value of the 'i' variable on the serial monitor delay(10); //wait 10 milliseconds (0.01 seconds) before running the 'for' loop again } //Once the 'for' loop has ended, the void loop will start over, resetting the i variable and running the 'for' loop 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!

Change the delay. How does that impact the sound?

Math question: How many times does the ‘for’ loop run each time the void loop(); runs? Hint: The condition of the ‘for’ loop will decide the highest number the variable can reach, and the starting value of the ‘for’ loop will decide the lowest value the variable can be.

Change the condition value in the ‘for’ loop. Try to predict what will happen before you actually upload your new code.

9_2 Fade Up Motor Strength

Fade Up Motor 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.

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/* Fade up the strength of the motor*/ void setup(){ pinMode(3,OUTPUT); //motor } void loop(){ /*create a 'counter' variable starting at 0 and, as long as the variable is less than 256, run the code between the curly braces, then increase the value of the 'i' variable by 1 */ for(int i = 1; i < 256; i++){ analogWrite(3,i); //use the value of 'i' to determine the strength of the buzz on the motor delay(10); //wait 10 milliseconds (0.01 seconds) before running the 'for' loop again } //Once the 'for' loop has ended, the void loop will start over, resetting the i variable and running the 'for' loop 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 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 starting value in the ‘for’ loop so the motor starts with a value of 50.

Reverse the direction of the 'for' loop by setting the starting value of the i variable as 256, the condition as i>0, and the change as i--.

9_1 Fade Up Tone

Fade Up Tone

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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/* Fade up an LED light from 0-255 brightness*/ void setup(){ pinMode(9,OUTPUT); //LED on an analogWrite pin. Pins 3,9,10,and 11 can use analogWrite } void loop(){ /*create a 'counter' variable with a starting value of 0 and, as long as the variable is less than 256, run the code between the curly braces, then increase the value of i by 1 */ for(int i = 0; i < 256; i++){ analogWrite(9,i); //use the value of 'i' to determine the brightness of LED 9 delay(25); //wait 25 milliseconds (0.025 seconds) before running the 'for' loop again } //Once the 'for' loop has ended, the void loop will start over, resetting the i variable and running the 'for' loop 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 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 delay inside the ‘for’ loop. Try to predict what will happen before you actually upload your new code.

Change the number that is the condition in the ‘for’ loop. In the example, that number is 256. What happens if you make it smaller?

Add more LEDs to this program. Remember that only LEDs 9,10, and 11 can fade up and down. You will need 1 new pinMode and 1 new analogWrite function for each LED you add to the program.

9_0 Fade Up LED

Fade Up 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.

Restore 12 14 18 24 30

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/* Fade up the tones on a speaker*/ void setup(){ pinMode(2,OUTPUT); //speaker } void loop(){ /*create a 'counter' variable starting at 40 and, as long as the variable is less than 1000, run the code between the curly braces, then increase the value of the 'i' variable by 1 */ for(int i = 40; i < 1000; i++){ tone(2,i); //use the value of 'i' to determine the tone playing on the speaker delay(10); //wait 10 milliseconds (0.01 seconds) before running the 'for' loop again } //Once the 'for' loop has ended, the void loop will start over, resetting the i variable and running the 'for' loop 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 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 condition in the ‘for’ loop so that the tone stops rising somewhere before 1000 hertz.

Change the delay to affect how the tone changes.

Change the starting value in the ‘for’ loop so the tone starts playing with a hertz value that is higher than 40