java - 如何通过串口将多个参数传递给 Arduino mega [英] java - how to pass multiple parameters over serial port to Arduino mega

问题描述

通过我的java程序.我想将一个字节值传递给 Arduino mega 来使 LED 闪烁同时我想将一个字符串值传递给 Arduino 以显示在液晶显示器中.

Through my java program. i want to pass a byte value to the Arduino mega to blink an Led and also at the same time i want to pass a string value to the Arduino to be displayed in the lcd.

如何分别从 java 程序中获取以上 2 个输入到 Arduino 并在 Arduino 内部的不同进程中使用它们..

How can I separately get above 2 inputs from the java program to Arduino and use them in different processes inside Arduino..

LiquidCrystal lcd (12, 11, 10, 9, 8, 7);
int operation;

void setup() {

lcd.begin(16, 2);


Serial.begin(9600);
Serial1.begin(9600);
Serial2.begin(9600);

pinMode(3, OUTPUT);
pinMode(2, OUTPUT);

}

int count = 0; 
void loop() {

//LCD start
if (Serial.available()) {
// wait a bit for the entire message to arrive
delay(50);
// clear the screen
lcd.clear();
delay(10);
// read all the available characters
while (Serial.available() > 0) {
  // display each character to the LCD
  lcd.write(Serial.read());
 }
 } 
 //LCD end

 //LED Blink start
 if (Serial.available() > 0)
 delay(10);
 {
 operation = Serial.read();
  }

 if(operation == '2')
 {

  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);
  delay(50);
  digitalWrite(3, LOW);
  delay(50);
  }

  if(operation == '1')
  {

   digitalWrite(3, LOW);
   digitalWrite(2, HIGH);
   delay(50);
   digitalWrite(2, LOW);
   delay(50);
 }
  //LED Blink end

  // Recieve rfid tag numbers 
if(Serial1.available()) { 
   int x = Serial1.read();     
   Serial1.print(x);
  }

if(Serial2.available()) { 
   int x = Serial2.read();     
   Serial1.print(x);
  }

}

下面是发送数据的Java代码

将数字 1 发送到 Arduino 的代码

Below is the Java code to send data

Code to send number 1 to Arduino

String buf = "1";
char buf2[] = buf.toCharArray();
output.write((byte)buf2[0]);

发送字符串以显示在lcd中的代码

Code to send string to display in lcd

output.write("Hellow world. this is a String from java".getBytes());

当我单独运行这些代码时，它运行良好而不会受到任何干扰..但是当我同时执行它们时......有时液晶显示器中会显示值 1 或 2 ......并且 LED 无法正常闪烁.如何从java到arduino获取两个输入并在Arduino内部分别处理它们?

推荐答案

您可以连接数据.因此，如果您将Hello"和200"作为 2 个项目传递，那么在发送到 Arduino 之前将它们组合起来并发送Hello%200"并在 Arduino 内部的 % 上拆分.

You could concatenate the data. So, if you are passing "Hello" and "200" as 2 items then combine them before the send to Arduino and send "Hello%200" and split on the % inside the Arduino.

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