public Form1()
        {
            InitializeComponent();
            SerialPort1 = new SerialPort();
            SerialPort1.PortName = "COM3";
            SerialPort1.BaudRate = 9600;
            btnLigaLED.BackColor = Color.White;
            btnDesligaLED.BackColor = Color.White;
        }

        private void BtnLigaLED_Click(object sender, EventArgs e)
        {
            SerialPort1.Open();
            if (SerialPort1.IsOpen)
            {
                SerialPort1.WriteLine("1");
            }
            SerialPort1.Close();
            btnLigaLED.BackColor = Color.Aqua;
            btnDesligaLED.BackColor = Color.White;
        }

        private void BtnDesligaLED_Click(object sender, EventArgs e)
        {
            SerialPort1.Open();
            if (SerialPort1.IsOpen)
            {
                SerialPort1.WriteLine("0");
            }
            SerialPort1.Close();
            btnDesligaLED.BackColor = Color.Aqua;
            btnLigaLED.BackColor = Color.White;
        }
    }
}