Raspberry Pi PHP GPIO读取(Raspberry Pi PHP GPIO read)

 我有这个脚本来检查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>
 
 这连接到一个按钮和跨度： 
 
   <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，虽然引脚设置为1 ...当我从Raspberry Pi上的命令行运行读取它给我1 ....但我认为PHP脚本不起作用... 

I've got this script to check the GPIO pin status:
 
<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>
 
That connects to a button and span:
 
   <strong>Status: <span id="sttext"></span></strong></p>
   <button id="statusCheck" class="green-btn">Check Status </button>
 
The check PHP code is:
 
<?php
    system(exec ( "GPIO read 1", $status ));
    system(print_r ( $status ));
?>
 
I keeps outputing Closed, though the pin is set at 1... When I run the read from the commandline on the Raspberry Pi it gives me 1.... But the PHP script I think is not working...

原文：https://stackoverflow.com/questions/25103386