Question

我希望通过PHP获取HC-Sr04超声波传感器的距离和笔记本电脑上显示的LED灯的颜色任何人都可以请帮助我被困在这里.. 提前致谢

我的PHP代码..

<?php
echo "<p>Control Page</p><p>";
$port = fopen("COM4", "w+"); 
sleep(2);
?>
<br>
</form>
<?php
if ($_GET['distance']<30)
{
$data = $_GET['distance'];
echo '<td bgcolor="#FF0000"> red';
}
else if ($_GET['distance']>35){
    $data = $_GET['distance'];
    echo '<td bgcolor="#00FF00"> green';
}
else {
    echo "Empty";
    echo '<td bgcolor="#00FF00"> green';
}
fclose($port);
?>
</body>
</html>

我的Arduino代码：...

#define trigPin 10
#define echoPin 2
#define led 4
#define led2 6

void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(led, OUTPUT);
  pinMode(led2, OUTPUT);
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);  // Added this line
  delayMicroseconds(2); // Added this line
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10); // Added this line
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  delay(1000);
  distance = (duration/2) / 29.1;
  if (distance < 30) {  // This is where the LED On/Off happens
    digitalWrite(led,HIGH); // When the Red condition is met, the Green LED should turn off
  digitalWrite(led2,LOW);
}
  else  if(distance >35) {
    digitalWrite(led,LOW);
    digitalWrite(led2,HIGH);
  }
  else{
    digitalWrite(led,LOW);
    digitalWrite(led2,LOW);
  }
  }

Answer 1

我假设你使用linux。

首先，您必须设置串口：

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

然后你可以使用fread / fwrite

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

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

fclose($fp);

每次连接时，Arduino都会重新启动。

使用arduino的串口监视器进行调试！

祝你好运！

了解更多信息： https://systemsarchitect.net/2013/01/26/connecting-php-with-arduino-via-serial-port-on-linux/

如何通过PHP获取桌面上的hcsr04超声波传感器距离

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