How to compare string from Serial.read()?

Question

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 compariso

Answer 1

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="";
  } 
}