1. >_ Things Lab
Connecting PHP with Arduino

2. Circuit

3. Arduino Code : Part 1
int led = 12;
void setup() {
// Open serial communications
Serial.begin(9600);
// send an intro:
Serial.println("0=off, 1=on");
Serial.println();
pinMode(led,OUTPUT);
}

4. Arduino Code : Part 2
void loop() {
// get any incoming bytes:
if (Serial.available() > 0) {
int input = Serial.read();
if (input == 48) { //received 0
digitalWrite(led,LOW);
}
else if (input == 49) { //received 1
digitalWrite(led,HIGH);
}
}
}

5. PHP code (same dir as "php_serial.class.php")
<?php
include "php_serial.class.php";
$msg = $argv[1]; // 0=off, 1=on
$serial = new phpSerial;
$serial->deviceSet("/dev/ttyUSB0");
$serial->confBaudRate(9600);
$serial->confParity("none");
$serial->confCharacterLength(8);
$serial->confStopBits(1);
$serial->deviceOpen();
if (intval($msg)==0) $serial->sendMessage(0); //turn the led off
else $serial->sendMessage(1); //turn the led on
$serial->deviceClose();
?>

6. Running the code
• Upload code into Arduino
• Execute:
# get the PHP cli
sudo apt-get install php5-cli
php test.php [args] # run the program
• Pass 0 to turn the led off, or others to turn it
on