从Arduino返回PHP串行端口数据

Question

我想知道是否有一种方法可以通过PHP读取我的串行端口-可行:-)

在练习Arduino技能时，我开发了一个简单的LED ON / OFF草图。通过在串行监视器中 打开 或 关闭 它可以工作。

下一步，我整理了一个网页，充当GUI界面，以单击链接并执行上面的打开和关闭功能。该基于Web的GUI可通过PHP使用。我正在使用PHP
SERIAL
类与Arduino使用的串行端口进行交互。

问题是我需要找到一种从串行端口获取反馈的方法。 使用Arduino
IDE串行监视器，我可以看到打印的消息以响应每个串行输入，并且需要在PHP代码中检索相同的反馈。

PHP Serial类提供了 readPort（） 函数，但我不返回数据。

UPDATE [2]：

阿尔迪诺：

const int greenPin = 2;
const int bluePin = 3;
const int redPin = 4;

int currentPin = 0; //current pin to be faded
int brightness = 0; //current brightness level

void setup(){
  Serial.begin(9600);

  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(redPin, OUTPUT);
}

void loop(){
  //if there's any serial data in the buffer, read a byte
  if( Serial.available() > 0 ){
    int inByte = Serial.read();

      //respond only to the values 'r', 'g', 'b', or '0' through '9'
      if(inByte == 'r')
        currentPin = redPin;

      if(inByte == 'g')
        currentPin = greenPin;

      if(inByte == 'b')
        currentPin = bluePin;

      if(inByte >= '0' && inByte <= '9'){
        //map the incoming byte value to the range of the analogRead() command
        brightness = map(inByte, '0', '9', 0, 255);
        //set the current pin to the current brightness:
        analogWrite(currentPin, brightness);
      }

      Serial.print("Current Pin : ");
      Serial.println(currentPin);

      Serial.print("Brightness : ");
      Serial.println(brightness);

  }//close serial check

}

PHP / HTML：

<?php
    require("php_serial.class.php");
// include("php_serial.class.php");

    // Let's start the class
    $serial = new phpSerial();

    // First we must specify the device. This works on both Linux and Windows (if
    // your Linux serial device is /dev/ttyS0 for COM1, etc.)
    $serial->deviceSet("/dev/ttyACM0");

    // Set for 9600-8-N-1 (no flow control)
    $serial->confBaudRate(9600); //Baud rate: 9600
    $serial->confParity("none");  //Parity (this is the "N" in "8-N-1")
    $serial->confCharacterLength(8); //Character length     (this is the "8" in "8-N-1")
    $serial->confStopBits(1);  //Stop bits (this is the "1" in "8-N-1")
    $serial->confFlowControl("none");

    // Then we need to open it
    $serial->deviceOpen();

    // Read data
    $read = $serial->readPort();
print "<pre>";
print_r($read);
print "</pre>";

    // Print out the data
    echo $read;
        // print exec("echo 'r9g9b9' > /dev/ttyACM0");
    print "RESPONSE(1): {$read}<br><br>";

    // If you want to change the configuration, the device must be closed.
    $serial->deviceClose();
?>

<?php
    if( isset($_REQUEST['LED']) )
        response();
?>

<form action='index.php' method='POST'>
    <select id='led' name='LED'>
        <option id='nil'>-</option>
        <option id='red'>RED</option>
        <option id='green'>GREEN</option>
        <option id='blue'>BLUE</option>
        <option id='all'>ALL</option>
    </select>
    <input type='submit' value='SET'>
</form>

<?php
    print "Hi, Earthlings!";

    function response(){
        $CMDString = "";
        $execute   = false;

        if( isset($_REQUEST['LED']) ){
                switch ($_REQUEST['LED']) {
                    case 'RED':
                        $CMDString = 'r9';
                        $execute = true;

        exec("echo 'r9g0b0' > /dev/ttyACM0");

                print "<br>FOUND: {$_REQUEST['LED']}";
                        break;
                    case 'GREEN':
                        $CMDString = 'g9';
                        $execute = true;
                print "<br>FOUND: {$_REQUEST['LED']}";
                        break;
                    case 'BLUE':
                        $CMDString = 'b9';
                        $execute = true;
                print "<br>FOUND: {$_REQUEST['LED']}";
                        break;
                    case 'ALL':
                        $CMDString = 'r9g9b9';
                        $execute = true;
                print "<br>FOUND: {$_REQUEST['LED']}";
                        break;
                    default:
                        print exec("echo 'r0g0b0' > /dev/ttyACM0");
                        $execute = false;
                        break;
                }

                if($execute){
                    print exec("echo '{$CMDString}' > /dev/ttyACM0");
                    print "<br><br>executing: {$CMDString}";
                }
        }
    }
?>

Answer 1

我假设您在Linux上工作。

首先设置您的串行端口：

stty -F /dev/ttyACM0 cs8 9600 ignbrk -brkint -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts

然后，您可以使用良好的旧时尚fread / fwrite

$fp =fopen("/dev/ttyACM0", "w+");
if( !$fp) {
        echo "Error";die();
}

fwrite($fp, $_SERVER['argv'][1] . 0x00);
echo fread($fp, 10);

fclose($fp);

您只需要记住一件事。 Arduino将在每次连接时重新启动
。如果您不知道，它将使您感到困惑。例如，如果您连接（打开）并立即发送数据，Arduino将因为启动而错过它（这需要一两秒钟）。尝试睡眠，给它一些时间。如果要禁用重启，请在GRD和RST之间使用10uF电容器。

祝好运

ps。您可以使用“屏幕”进行故障排除

screen /dev/ttyACM0 9600

有关使用Arduino设置PHP的文章http://systemsarchitect.net/connecting-php-with-arduino-
via-serial-port-on-linux/以及其他内容，请参见http://systemsarchitect.net/arduino-and-php-
协议串行通信/。