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Rf Communication using arduino.
It uses the rf module which operates on 433 Mhz and is available easily on spark fun.
Rc Switch Library download
Transmitter
Receiver
 |
| fig 1 connection of rf link to arduino |
Here's the code:
Transmitter Code
/* Example for different sending methods
http://code.google.com/p/rc-switch/
Need help? http://forum.ardumote.com*/
#include <RCSwitch.h>
const int buttonPin = 3;
int buttonState = 0;
const int buttonPin2 = 2;
int buttonState2 = 0;
RCSwitch mySwitch = RCSwitch();
void setup() {
pinMode(buttonPin, INPUT);
pinMode(buttonPin2, INPUT);
Serial.begin(9600);
// Transmitter is connected to Arduino Pin #10 mySwitch.enableTransmit(10);
}
void loop() {
buttonState = digitalRead(buttonPin);
buttonState2 = digitalRead(buttonPin2);
if (buttonState == HIGH) {
mySwitch.send(9, 24);
delay(100);
}
else {
if (buttonState2 == HIGH) {
mySwitch.send(5, 24);
delay(100);
else {
}
// turn LED off:
}
delay(200);
}
Receiver Code
/*
Simple example for receiving http://code.google.com/p/rc-switch/ Need help? http://forum.ardumote.com */ #include <RCSwitch.h> int led = 13; RCSwitch mySwitch = RCSwitch(); #define pressed1 9 //defines incoming data set by user which is transmitted #define pressed2 5 void setup() { Serial.begin(9600); mySwitch.enableReceive(0); // Receiver on interrupt 0 => that is pin #2 pinMode(led,OUTPUT); } void loop() { digitalWrite(led,LOW); if (mySwitch.available()) { int value = mySwitch.getReceivedValue(); if (value == 0) { Serial.print("Unknown encoding"); } else { // used for checking received data
/*Serial.print("Received ");
Serial.print( mySwitch.getReceivedValue() );
Serial.print(" / ");
Serial.print( mySwitch.getReceivedBitlength() );
Serial.print("bit ");
Serial.print("Protocol: ");
Serial.println( mySwitch.getReceivedProtocol() );*/ }
if (mySwitch.getReceivedValue()) { process(); } mySwitch.resetAvailable(); Serial.println(" "); } digitalWrite(led,LOW); delay(100); } void process() { unsigned long res = mySwitch.getReceivedValue(); switch (res){ case pressed1: Serial.println("pressed 1"); break; case pressed2: Serial.println("pressed 2"); break; } }
Credits : Rc Switch library
Sparkfun
arduino