[英]How can I receive data from a PC to an Arduino?
I developed an application that sends data for an Arduino by the serial port, but I can't understand how I can receive it on the Arduino. 我开发了一个通过串口发送Arduino数据的应用程序,但我无法理解如何在Arduino上接收它。 I send a string by the serial port for the Arduino and the Arduino receives it, but it does not work in my code (on the Arduino, I receive a byte at a time).
我通过Arduino的串口发送一个字符串,Arduino接收它,但它在我的代码中不起作用(在Arduino上,我一次收到一个字节)。
Update: it's working ;) 更新:它正在运行;)
The code in C# that sends data: C#中发送数据的代码:
using System;
using System.Windows.Forms;
using System.Threading;
using System.IO;
using System.IO.Ports;
pulic class senddata() {
private void Form1_Load(object sender, System.EventArgs e)
{
//Define a serial port.
serialPort1.PortName = textBox2.Text;
serialPort1.BaudRate = 9600;
serialPort1.Open();
}
private void button1_Click(object sender, System.EventArgs e)
{
serialPort1.Write("10"); //This is a string. The 1 is a command. 0 is interpeter.
}
}
The Arduino code: Arduino代码:
I have Update the Code 我有更新代码
#include <Servo.h>
Servo servo;
String incomingString;
int pos;
void setup()
{
servo.attach(9);
Serial.begin(9600);
incomingString = "";
}
void loop()
{
if(Serial.available())
{
// Read a byte from the serial buffer.
char incomingByte = (char)Serial.read();
incomingString += incomingByte;
// Checks for null termination of the string.
if (incomingByte == '0') { //When 0 execute the code, the last byte is 0.
if (incomingString == "10") { //The string is 1 and the last byte 0... because incomingString += incomingByte.
servo.write(90);
}
incomingString = "";
}
}
}
Some things which make my eyebrow raise: 一些令我眉毛的东西:
serialPort1.Write("1");
This will write exactly one byte, the 1
, but no newline and no trailing NUL-Byte. 这恰好写一个字节,在
1
,但没有换行,并没有尾随NUL字节。 But here you are waiting for an additional NUL byte: 但是你在这里等待一个额外的NUL字节:
if (incomingByte == '\0') {
You should use WriteLine
instead of Write
, and wait for \\n
instead of \\0
. 您应该使用
WriteLine
而不是Write
,并等待\\n
而不是\\0
。
This has two side effects: 这有两个副作用:
First: If there is some buffering configured, then there is a certain chance, than a new line will push the buffered data to the Arduino. 第一: 如果配置了一些缓冲,那么有一定几率,新线将把缓冲的数据推送到Arduino。 To be certain you have to dig through the docs at MSDN.
确定你必须深入研究MSDN上的文档。
Second: This makes your protocol ASCII-only. 第二:这使您的协议仅限ASCII。 This is important for easier debugging.
这对于简化调试很重要。 You can then use a plain terminal program like Hyperterm or HTerm ( edit ) or even the Serial Monitor in the Arduino IDE itself ( edit ) to debug your Arduino-Code without worrying about bugs in your C# code.
然后,您可以使用Hyperterm或HTerm( 编辑 )等普通终端程序 ,甚至Arduino IDE中的串行监视器( 编辑 )来调试Arduino代码,而无需担心C#代码中的错误。 And when the Arduino code works you can concentrate on the C# part.
当Arduino代码工作时,您可以专注于C#部分。 Divide et impera.
划分et impera。
Edit: Another thing I noticed after digging out my own Arduino: 编辑:在挖掘出我自己的Arduino之后我注意到的另一件事:
incomingString += incomingByte;
....
if (incomingByte == '\n') { // modified this
if(incomingString == "1"){
This will of course not work as expected, because the string will contain "1\\n" at this point. 这当然不会按预期工作,因为此时字符串将包含“1 \\ n”。 Either you compare to "1\\n" or move the
+=
line after the if
. 您可以比较“1 \\ n”或移动
if
后面的+=
行。
You could alternatively try using the Firmata library - it's a much better way of having standard firmware on the Arduino and managing it from .net 您也可以尝试使用Firmata库 - 这是在Arduino上使用标准固件并从.net管理它的更好方法
I believe, Firmata 2.0+ has support for I2C and servo control. 我相信,Firmata 2.0+支持I2C和伺服控制。
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