serial input to arduino

Forum 2005-2010 (read only) General Frequently-Asked Questions
3

Simple serial code that sends back what it has received.

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

String readString;

void setup() {
      Serial.begin(9600);
        Serial.println("serial test 0021"); // so I can keep track of what is loaded
        }

void loop() {

        while (Serial.available()) {
        delay(10);  
          if (Serial.available() >0) {
        char c = Serial.read();
        readString += c;}
        }
        
      if (readString.length() >0) {
      Serial.println(readString);
      
      readString="";
      } 
   }