| Index

| Reference for Wiring 1.0 (ALPHA) 0021+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.

Name |  | ### setup()
Examples |  |
    void setup() {
      pinMode(0, OUTPUT);
      Serial.begin(9600);
    }

    void loop() {
      Serial.print('.');
      delay(1000);
    }
Description |  | Function called once when the program begins running. Used to define initial enviroment properties such as a pin mode (INPUT or OUTPUT), starting the serial port etc. before the loop() begins executing. Variables declared within setup() are not accessible within loop().
Syntax |  |
    void setup() {
      statements
    }
Parameters |  |
statements |  | any valid statements
Returns |  | None
Usage |  | Web & Application
Related |  | loop()