javascript - 树莓派 PHP GPIO 读取

Question

我有这个脚本来检查 the GPIO引脚状态:

<script type="text/javascript">

    $(document).ready(function () {
        // This is the init function
        // Runs when the page has completed loading

        $('#statusCheck').click(function() {
            //console.log('checking status');

            $.ajax({
                url: "check.php",
                success: function (data) {
                    if(data != 1 )
                    {
                      // Door is closed
                      $('#sttext').html('<span style= color:green;>Closed</span>');
                    }
                    else if(data == 1)
                    {
                      // Door is open
                      $('#sttext').html('<span style= color:green;>Open</span>Open');
                    }
                    //$('#debug').html(''); // Print null string to clear message
                    //$('#debug').html(data); // Debug message, printing out read back status.
                }

            });
        });
    });
</script>

连接到一个按钮和 span:

   <strong>Status: <span id="sttext"></span></strong></p>
   <button id="statusCheck" class="green-btn">Check Status </button>

检查PHP代码是:

<?php
    system(exec ( "GPIO read 1", $status ));
    system(print_r ( $status ));
?>

我一直输出 Closed，尽管 pin 设置为 1...当我从 Raspberry Pi 上的命令行运行读取时，它给了我 1...但是我认为 PHP 脚本不起作用...

Answer 1

我认为问题出在您的 PHP 脚本上。试试这个:

<?php
    exec("gpio read 1", $status);
    print_r($status); //or var_dump($status);
?>