sub USB {
    my $Q = shift;
    my $arduino = Device::SerialPort->new("/dev/serial/by-id/usb-Arduino__www.arduino.cc__Arduino_Mega_2560_74136333033351011152-if00");
    if ( defined( $arduino ) ) {
        $arduino->baudrate(9600);
        $arduino->parity("none");
        $arduino->databits(8);
        $arduino->stopbits(1);
        $arduino->read_char_time(0);
        $arduino->read_const_time(500);
        $arduino->write_settings || undef $arduino;
        writelog( "server:[portSet]" );
    } else {
        writelog( "server:[portSet]: failed" );
    }
    while( my $request = $Q->dequeue ) {
        my $retQ = $Q->dequeue;
        $arduino->write($cmd);
        my $answer = getLineFromArduino()
        $retQ->enqueue( $answer );
    }
}