Projeto Controle PHP7

Criando o circuito do Controle
=====================================================
Código do projeto de Controle
Código do Arduino

int led8  =  2;
int led6  =  4;
int led4  =  6;
int led2  =  8;
 
void setup()   {
 
  Serial.begin(9600);
 
  pinMode(led2, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led6, OUTPUT);
  pinMode(led8, OUTPUT);
 
}
 
void loop()
{
  char caracter;
  caracter = Serial.read();
  //se pressionado "a" liga led 2
  if(caracter == 'a')
  {
      digitalWrite(led2, HIGH);
  }
  else
    //Se pressionado "b" liga led 4
    if(caracter == 'b')
    {
         digitalWrite(led4, HIGH);
    }
    else
      //S pressionado "c" liga led 6
      if(caracter == 'c')
      {
         digitalWrite(led6, HIGH);
      }
      else
        //Se pressionado "d" liga led 8
        if(caracter == 'd')
        {
            digitalWrite(led8, HIGH);
        }
 
  delay(1000);
}


Código de controle de comunicação em PHP7

<?php
 
$port = fopen("COM3", "w");
if ($_POST['estado']=="a")
{
    echo "Ligou Led 1";
    fwrite($port, "a");
}
    if ($_POST['estado']=="b")
    {
        echo "Ligou Led 2";
        fwrite($port, "b");
    }
        if ($_POST['estado']=="c")
        {
            echo "Ligou Led 3";
            fwrite($port, "c");
        }
            if ($_POST['estado']=="d")
            {
                echo "Ligou Led 4";
                fwrite($port, "d");
            }
           
fclose($port);
?>


Página index.php


<html>
<head>
<meta http-equiv="Content-Language" content="pt-br">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Controle de Leds com Arduino</title>
</head>
<body>
<div align="center">
    <table border="0" width="15%" cellpadding="0">
        <tr></tr><tr><td>
 
<!--------------POST DO BOTAO LIGAR Led 1------------------------>
<form method="POST" action="arduino.php">
<p>
    <input type="hidden" value="a" name="estado" >
    <input type="submit" value="Ligar Led 1" name="a">
</p>
</form>
    </td></tr><tr>
 
<!--------------POST DO BOTAO LIGAR Led2--------------------------->
 
<form method="POST" action="arduino.php">
 
    <input type="hidden" value="b" name="estado" >
    <td><input type="submit" value="Ligar Led 2" name="b">
</td>
</form>
        </tr><tr><td>
 
<!-------------POST DO BOTAO LIGAR Led3------------------------->
 
<form method="POST" action="arduino.php">
<p>
    <input type="hidden" value="c" name="estado" >
    <input type="submit" value="Ligar Led 3" name="c">
</p>
</form>
        </td></tr><tr>
 
<!------------POST DO BOTAO LIGAR Led4--------------------------->
 
<form method="POST" action="arduino.php">
 
    <input type="hidden" value="d" name="estado" >
    <td><input type="submit" value="Ligar Led 4" name="d">
</td>
</form>
 </tr>
 </tr>
    </table>
</div>
</body>
</html>