Mix Colors of the Red-Green-Blue LED with Buttons

Code

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/* Set up 3 buttons to correspond to each color from the RGB LED Pressing any single button shows one color. Pressing multiple buttons mixes colors! */ void setup() { pinMode(8,INPUT_PULLUP); //button pinMode(9,INPUT_PULLUP); //button pinMode(10,INPUT_PULLUP); //button pinMode(5,OUTPUT); //one leg of the RGB LED pinMode(6,OUTPUT); //one leg of the RGB LED pinMode(7,OUTPUT); //one leg of the RGB LED } void loop() { if(digitalRead(8)==LOW){ //if button 8 is pressed... digitalWrite(5,HIGH); //turn on the LED color on port 5 } else{ //otherwise, if button 8 is not pressed... digitalWrite(5,LOW); //turn off port 5 } if(digitalRead(9)==LOW){ //if button 9 is pressed... digitalWrite(6,HIGH); //port 6 is on } else{ //otherwise.... digitalWrite(6,LOW); //port 6 is off } if(digitalRead(10)==LOW){ //if button 10 is pressed... digitalWrite(7,HIGH); //port 7 is on } else{ //otherwise.... digitalWrite(7,LOW); //port 7 is off } } // (c) 2021 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense
 

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!

Video Notes for Code Lab Users:

  • Your buttons are on port 8 instead of 2, port 9 instead of 5, and port 10 instead of 8.

  • Your RGB LED uses ports 5, 6, and 7 instead of 11, 12 and 13 as the video says.

Challenges

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Concepts

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Quiz

If you're having trouble, try to run an experimental program or look at the example code to help you find the answer.

1. Which syntax ends the entire 'void loop' function?




2. Which syntax ends a single code command?