433Mhz RF link kit

Introduction

The kit is consisted of transmitter and receiver, popular used for remote control.

Specification

• Frequency: 433Mhz.
• Modulation: ASK
• Receiver Data Output: High - 1/2 Vcc, Low - 0.7v
• Transmitter Input Voltage: 3-12V (high voltage = more transmitting power)

examlple code

Transmmiter:

#include <VirtualWire.h>
#undef int
#undef abs
#undef double
#undef float
#undef round
void setup()
{
   Serial.begin(9600);	  // Debugging only
   Serial.println("setup");

   // Initialise the IO and ISR
   vw_set_ptt_inverted(true); // Required for DR3100
   vw_setup(2000);	 // Bits per sec
}
void loop()
{
   const char *msg = "hello";

   digitalWrite(13, true); // Flash a light to show transmitting
   vw_send((uint8_t *)msg, strlen(msg));
   vw_wait_tx(); // Wait until the whole message is gone
   digitalWrite(13, false);
   delay(200);
}

Receiver:

#include <VirtualWire.h>
#undef int
#undef abs
#undef double
#undef float
#undef round
void setup()
{
   Serial.begin(9600);	// Debugging only
   Serial.println("setup");

   // Initialise the IO and ISR
   vw_set_ptt_inverted(true); // Required for DR3100
   vw_setup(2000);	 // Bits per sec

   vw_rx_start();       // Start the receiver PLL running
}

void loop()
{
   uint8_t buf[VW_MAX_MESSAGE_LEN];
   uint8_t buflen = VW_MAX_MESSAGE_LEN;

   if (vw_get_message(buf, &buflen)) // Non-blocking
   {

int i;

       digitalWrite(12, true); // Flash a light to show received good message

// Message with a good checksum received, dump it. Serial.print("Got: ");

for (i = 0; i < buflen; i++) { Serial.print(buf[i], HEX); Serial.print(" "); } Serial.println("");

       digitalWrite(12, false);
   }
}