gs-arduino/util/arduino.php

<?php
/**
 * Fun with Binary - a fun way of introducing binary
 * Copyright (C) 2018, Diogo Cordeiro.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

class arduino
{
    /*
     * ==Warning==
     * You must add www-data to dialout group
     * for serial port communication to work!
     */

    // Arduino related
    protected $comPort = "/dev/ttyACM0";

    /**
     * Resets Arduino
     */
    public function reset()
    {
        // Sends reset command to Arduino
        $fp = fopen($this->comPort, "wb");
        fwrite($fp, 9); // 9 is the Reset Byte
    }

    /**
     * Send a byte to Arduino
     */
    public function send($byte)
    {
        // Updates Arduino output
        $fp = fopen($this->comPort, "wb");
        fwrite($fp, (int)$byte);
    }
}