Arduino Wireless SD Shield Tutorial

Step 6: Program the transmitter

Plug in the Arduino for the transmitter. Make certain the micro switch is toggled to the "USB" option.

Before you upload any code to the Arduino, open the serial monitor. Type in "h" and hit the "send" button. The LED on your receiver should light up. You have made a wireless connection!

Fantastic.

Now upload the following code:

/*
  
  Wireless transmitter demo  

  
  Based on Button example code
  http://www.arduino.cc/en/Tutorial/Button
  created 2005
  by DojoDave <http://www.0j0.org>
  modified 28 Oct 2010
  by Tom Igoe
 
 The circuit:
 * pushbutton attached to pin 2 from +5V
 * 10K resistor attached to pin 2 from ground
 
 This code is in the public domain.
 
 */

// constants won't change. They're used here to 
// set pin numbers:
const int buttonPin = 2;     // the number of the pushbutton pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize serial communication:
  Serial.begin(9600); 
     
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);     
}

void loop(){
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) {     
    //transmit a High command to the pumpkin and delay a second so that it does not receive more than one command
    //per button press
    Serial.println('h');
    delay(1000); 
  } 
}