Let's change the program

Sample Program, we cannot control the red LED, so let's add a program to control the red LED.

Adding operation buttons (HTML)

First, we will add a red button in HTML.

HTML for the yellow button

<div class="yellow_btn d-flex flex-column">
  <button class="btn btn-warning m-1" id="yellow_on">ON</button>
  <button class="btn btn-warning m-1" id="yellow_off">OFF</button>

Copy and add the following code above it

<div class="red_btn d-flex flex-column">
  <button class="btn btn-danger m-1" id="red_on">ON</button>
  <button class="btn btn-danger m-1" id="red_off">OFF</button>

The CSS is loaded and used from something called Bootstrap.
For example, the class name btn-danger is used to make the button red. If you are interested, you can refer to the reference and change the design as you like.

Add movement (JavaScript)

Next, we will make it possible to control the ON/OFF of the red LED when this button is pressed.

In jQuery, when you want to do something when the id "on" is pressed, you can write something like this.

  // on pressed

The red buttons that we just added are given the ids red_on and red_off, respectively, so we can write this to turn the LED on when the ON button is pressed and turn it off when the OFF button is pressed.

$('#red_on').click(function () {

$('#red_off').click(function () {

Add the above program under the green and yellow programs (under the following part of the sample program) and try to run it.

$('#yellow_off').click(function () {

The screen will look like the following, and if you can control the red LED with the red button, you have succeeded.