如何从Serial.read比较字符串（）？ [英] How to compare string from Serial.read()?

问题描述

下面我有，我从这个论坛，我跟着通过。它没有为我工作，但他们声称，code是罚款。我已经试了好几种字符串比较的方法，如 string.equals（串）和标准 == 运营商，仍与没有运气。

  INT ledPin = 13;
串readString;无效设置（）{
  Serial.begin（9600）;
  pinMode（ledPin，OUTPUT）;
  Serial.println（开/关测试0021系列）; //这样我就可以跟踪
}空隙环（）{
  而（Serial.available（））{
    延迟（3）;
    焦C = Serial.read（）;
    readString + = C;
  }
  如果（readString.length（）大于0）{
    如果（readString ==上）{
      Serial.println（接通）;
      digitalWrite（ledPin，HIGH）;
    }
    如果（readString ==关）{
      digitalWrite（ledPin，LOW）;
    }
    readString =;
  }
}
 

解决方案

我能够通过简单地添加 readString.trim（）来解决昨晚问题;字符串比较之前 。这是因为将有换行符其中id没有在Arduino的控制台打印出任何东西。

我把函数如下我的code：

  INT ledPin = 13;
串readString;无效设置（）{
  Serial.begin（9600）;
  pinMode（ledPin，OUTPUT）;
  Serial.println（开/关测试0021系列）; //这样我就可以跟踪
}空隙环（）{  而（Serial.available（））{
    延迟（3）;
    焦C = Serial.read（）;
    readString + = C;
  }
  readString.trim（）;
  如果（readString.length（）大于0）{
    如果（readString ==上）{
      Serial.println（接通）;
      digitalWrite（ledPin，HIGH）;
    }
    如果（readString ==关）
    {
      Serial.println（关闭）;
      digitalWrite（ledPin，LOW）;
    }    readString =;
  }
}
 

I have this code below where I got from this forum that I followed through. It did not work for me but they claim that the code is fine. I already tried several string comparison methods such as string.equals(string) and the standard == operator, still with no luck.

int ledPin = 13;
String readString;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT); 
  Serial.println("serial on/off test 0021"); // so I can keep track
}

void loop() {
  while (Serial.available()) {
    delay(3);  
    char c = Serial.read();
    readString += c; 
  }
  if (readString.length() >0) {
    if (readString == "on") {
      Serial.println("switching on");
      digitalWrite(ledPin, HIGH);
    }
    if (readString == "off") {
      digitalWrite(ledPin, LOW);
    }
    readString="";
  } 
}

解决方案

I am able to solve last night problem by simply adding readString.trim(); before string comparison. This is because there will be newline character where id did not print anything in the arduino console.

I place the function as in my code below:

int ledPin = 13;
String readString;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT); 
  Serial.println("serial on/off test 0021"); // so I can keep track
}

void loop() {

  while (Serial.available()) {
    delay(3);  
    char c = Serial.read();
    readString += c; 
  }
  readString.trim();
  if (readString.length() >0) {
    if (readString == "on"){
      Serial.println("switching on");
      digitalWrite(ledPin, HIGH);
    }
    if (readString == "off")
    {
      Serial.println("switching off");
      digitalWrite(ledPin, LOW);
    }

    readString="";
  } 
}

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