Need to send bytes to microcontroller using C#

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Hello good people.
I want to send data to controller, and then its will turn a "Light-emitting diode" On.
IM confused how to send bytes , as i get this command sending data on string format, not on bytes:

serialPort1.Write("1");

Maybe im wrong
Any Help, Thanks.
Code included below.

What I have tried:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Sending_data_serial
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            serialPort1.Open();
            serialPort1.Write("1");
            serialPort1.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            serialPort1.PortName = textBox1.Text;
            serialPort1.BaudRate = Convert.ToInt32(textBox2.Text);


        }
    }
}

Posted 26-Jan-17 12:52pm

JeezyWonder

Updated 26-Jan-17 21:44pm

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Afzaal Ahmad Zeeshan · Accepted Answer · 2017-01-26T13:28:00

You need to have a look at this overload of the function, SerialPort.Write Method (Byte[], Int32, Int32) (System.IO.Ports)[^], it allows you to write the bytes from a buffer. Pass 0 and byteArray.Length as the parameter to send a complete buffer to the serial port.

To send just one byte, you can do the following,

C#

// bytes is assumed to be of byte[] type with some data.
serialPort1.Write(bytes, 0, 1); // Start from 0, go to 1; 1 byte.

Another good example is given in solution by Jochen in Solution 2, also see that but you can get the bytes from any source, be that character encoding, command or whatever.

Jochen Arndt · Accepted Answer · 2017-01-26T21:44:00

You can still use the method accepting a string to send bytes because that uses ASCII encoding by default (converts each character to an ASCII byte value).

So the binary value 0x01 can be send as

C#

serialPort1.Write("\u0001");

But if you need to send data containing a null byte, values >= 128, or avoid the Unicode to ASCII conversion, you must use the method accepting a byte array:

C#

var dataByte = new byte[] { 0x00 };
serialPort1.Write(dataByte, 0, 1);

Need to send bytes to microcontroller using C#

2 solutions

Solution 1

Solution 2

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