315MHz Simple RF Link Kit

Introduction

This kit is used for one way wireless communication at a frequency of 315MHz and includes a transmitter module and a receiver module. The Grove configuration of this kit allows for around 40 meters of transmitting distance indoors, or around 100 meters outside.

Features

  • GROVE compatible interface.
  • Uses ASK (Amplitude Shift Keying) Modulation.
  • One way communication

Specification

Transmitter Module

ItemMinTypicalMaxUnit
Working Voltage3.05.012.0VDC
Current3/10mA
Work ModeASK/
Transmit Power(Max)15mW
Working Distance40/100m

Receiver Module

ItemTypicalUnit
Working Voltage5VDC
Quiescent Current5mA
Receiver Sensitivity-103dBm
Operating frequency315MHz

Application Ideas

  • Remote control
  • Remote automation
  • Alarm

Usage

The transmitter and receiver modules both rely on a single wire for communication. Though using the UART supplied by the Arduino platform can work, it is recommended, instead, to use the VirtualWire library which uses Amplitude Shift Keying for modulation which provides better communication.
Both the transmitter and receiver modules require three wires: Vcc, Ground, and signal. Both of pin 2 parts of the kit are not connected.
  • Connect the Transmitter module to Digital I/O 2 of the Grove_-_Base_Shield on the Arduino being used for transmission.
  • Connect the Receiver module to Digital I/O 2 of the Grove_-_Base_Shield on the receiving Arduino.
Note: The hardware installation can refer to the usage of the module Grove - 433MHz Simple RF Link Kit.
  • Download the File: VirtualWire library and unzip it into the libraries file of Arduino IDE by the path: ..\arduino-1.0\libraries. Please reference here.
  • Upload the below code for transmitter module:
#include <VirtualWire.h>

//Grove - 315(433) RF link kit Demo v1.0
//by :http://www.seeedstudio.com/
//connect the sent module to D2 to use
#include <VirtualWire.h>

int RF_TX_PIN = 2;

void setup()
{
    vw_set_tx_pin(RF_TX_PIN); // Setup transmit pin
    vw_setup(2000); // Transmission speed in bits per second.
}

void loop()
{
    const char *msg = "hello";
    vw_send((uint8_t *)msg, strlen(msg));  // Send 'hello' every 400ms.
    delay(400);

}
  • Upload the below code for receiver module:
//Grove - 315(433) RF link kit Demo v1.0
//by :http://www.seeedstudio.com/
//connect the receive module to D2 to use ..
#include <VirtualWire.h>

int RF_RX_PIN = 2;

void setup()
{
    Serial.begin(9600);
    Serial.println("setup");
    vw_set_rx_pin(RF_RX_PIN);  // Setup receive pin.
    vw_setup(2000); // Transmission speed in bits per second.
    vw_rx_start(); // Start the PLL receiver.
}

void loop()
{
    uint8_t buf[VW_MAX_MESSAGE_LEN];
    uint8_t buflen = VW_MAX_MESSAGE_LEN;
    if(vw_get_message(buf, &buflen)) // non-blocking I/O
    {
        int i;
        // Message with a good checksum received, dump HEX
        Serial.print("Got: ");
        for(i = 0; i < buflen; ++i)
        {
            Serial.print(buf[i], HEX);
            Serial.print(" ");
            //Serial.print(buf[i]);
        }
        Serial.println("");
    }
}
  • Open the serial monitor of receiver module to see the result.
This is just a simple transmitter and receiver instance as a reference.

Version Tracker

RevisionDescriptionsRelease
v0.9bInitial public release03,Oct,2011

Resources

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