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PHP IoT Hardware Development Example: Learn Device Monitoring with Sample Code

WBOYOriginal: 2023-09-12 18:36:141576browse

PHP (Hypertext Preprocessor) is a scripting language widely used in server-side development. In the field of Internet of Things, PHP can be used to develop and control various hardware devices. This article will use a sample code to introduce how to use PHP to develop IoT hardware applications, and take device monitoring as an example.

1. Preparation work
Before starting development, we need to prepare the necessary hardware and software environment. First, we need to choose a suitable hardware device, such as Arduino Uno development board. Then, we need to install the corresponding development environment on the computer, including Arduino IDE and WAMP server. Finally, we need to download and install the PHPoC plugin, which allows communication with the Arduino.

2. Hardware connection
Before we start writing code, we need to connect the hardware device to the computer. First, connect the Arduino Uno board to the computer via USB cable. Then, select the correct board and port in the Arduino IDE. Next, open the "DeviceMonitoring" program in the sample code in the Arduino IDE and upload the code to the Arduino development board.

3. Writing PHP code
Before starting to write PHP code, we need to first determine the equipment and corresponding sensors that need to be monitored. In this example we will monitor indoor temperature and humidity. First, we need to create a new PHP file named "DeviceMonitoring.php". We can then use the functions provided by the PHPoC plugin to communicate with the Arduino.

The following is a simple sample code for reading Arduino sensor data and displaying it on a web page:

<?php
require_once("phpoc.php");

$p = new Phpoc();

if(!$p->open("192.168.0.100"))
{
  echo "Error: Unable to connect to Arduino.";
  exit;
}

$temp = $p->cmd("get env temp");
$humidity = $p->cmd("get env humidity");

$p->close();

?>

<html>
  <head>
    <title>Device Monitoring</title>
  </head>
  <body>
    <h1>Device Monitoring</h1>
    <p>Temperature: <?php echo $temp; ?></p>
    <p>Humidity: <?php echo $humidity; ?></p>
  </body>
</html>

In the above code, we first start by calling phpoc.php file to import the PHPoC plug-in. We then create a new PHPoC object and use its open() method to connect to the Arduino. Next, we use the cmd() method to send commands to Arduino and store the read data in the variables $temp and $humidity. Finally, we use the close() method to close the connection to the Arduino.

4. Run the code
After completing the code writing, we can access the PHP file through the browser to achieve device monitoring. Enter the address of the WAMP server in the browser address bar, followed by the name of the PHP file we created (for example: http://localhost/DeviceMonitoring.php). Then, we can see the real-time updates of the monitoring data.

Through the above sample code, we can learn how to use PHP to develop and control IoT hardware devices. By studying the example of device monitoring, we can learn how to communicate with sensors and display real-time data on a web page. With the development of the Internet of Things, PHP, as a powerful and flexible development language, will play a more important role in the field of the Internet of Things.

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