store a long string

Projects Programming
1

HI,
In c# you can use string to house a string, I just can's find out how to do this is the arduino code.
I now use char, but I can only house one character.
Please help!

greetings,
Luc

2

You need a char array.

ie

char areYouAPieceOfString[]={"No I'm a fraid knot"};
3

Don't need the braces though:

char areYouAPieceOfString[]="No I'm a fraid knot";
4

You can use an array of chars. Just make sure that the next character position after the text has a value of 0 to mark the end of the string (small s).

...R

5

Now my code does not work, my current code is:

char i;
int i_int;
void setup() {
    pinMode(10, OUTPUT);
    Serial.begin(9600); 
    delay(50);
        
}



void loop() {
    char i[]={Serial.read()};
    if(i == "1"){
      digitalWrite(10, HIGH);
    }
    
    if(i == "0"){
      digitalWrite(10, LOW);
    }}

my sending code sends 0 and 1.
I need the longer string to do something like: led3state0

Moderator edit: nice try, but code tags corrected

6

Very simple code that captures a string of characters sent from the serial monitor and then evaluates the captured String for the desired LED commands.

// zoomkat 8-6-10 serial I/O string test
// type a string in serial monitor. then send or enter
// for IDE 0019 and later

//A very simple example of sending a string of characters 
//from the serial monitor, capturing the individual 
//characters into a String, then evaluating the contents 
//of the String to possibly perform an action (on/off board LED).

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) {
    Serial.println(readString);

    if(readString.indexOf("on") >=0)
    {
      digitalWrite(ledPin, HIGH);
    }

    if(readString.indexOf("off") >=0)
    {
      digitalWrite(ledPin, LOW);
    }

    readString="";
  } 
}
7

When I wrote my earlier reply I didn't know you were trying to receive data from a serial input. Look at the Thread serial input basics

...R

8 
    char i[]={Serial.read()};

A long string, huh?

9

PaulS:

    char i[]={Serial.read()};

A long string, huh?

:))