> For the complete documentation index, see [llms.txt](https://learn.pakronics.com.au/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learn.pakronics.com.au/seed-studio/grove-modules/actuator/grove-315mhz_rf_kit.md).

# Grove 315MHz RF Kit

![](https://raw.githubusercontent.com/SeeedDocument/Grove-315MHz_RF_Kit/master/img/315MHz-Simple-RF-Link-Kit.jpg)

This kit is used for one way wireless communication at a frequency of 315MHz and includes a transmitter module and a receiver module. The twig configuration of this kit allows for around 40 meters of transmitting distance indoors, or around 100 meters outside. The 315 MHz frequency is suitable for use without a license in the United States. For use in Europe, please see the 433 MHz version of this product.

[![](https://raw.githubusercontent.com/SeeedDocument/common/master/Get_One_Now_Banner.png)](http://www.seeedstudio.com/Grove-315MHz-Simple-RF-Link-Kit-p-1061.html)

## Features

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

!!!Tip More details about Grove modules please refer to [Grove System](http://wiki.seeed.cc/Grove_System/)

## Application Ideas

* Remote control
* Remote automation
* Alarm

## Mechanical Dimensions

* Receiver: 24mm by 42mm
* Transmitter: 20mm by 24mm

## Platforms Supported

## 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. Pin 2 of both parts of the kit are not connected.

### Hardware Installation

Connect the Transmitter module to Digital I/O 2 of the [Grove-Base Shield V2](https://app.gitbook.com/Base_Shield_V2) on the arduino being used for transmission.

Connect the Transmitter module to Digital I/O 2 of the [Grove-Base Shield V2](https://app.gitbook.com/Base_Shield_V2) on the receiving arduino.

### Programming

Sample code for Transmitter:

```
#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);

}
```

Sample code for Receiver:

```
#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.println("");
  }
}
```

## Resources

* Demo code: [433MHz demo.zip](https://raw.githubusercontent.com/SeeedDocument/Grove-315MHz_RF_Kit/master/res/433MHz_demo.zip)
* [VirtualWire 1.27](http://www.airspayce.com/mikem/arduino/VirtualWire/VirtualWire-1.27.zip)
* [VirtualWire Documentation](http://www.open.com.au/mikem/arduino/VirtualWire.pdf)
* [TI:LM358PSR](https://raw.githubusercontent.com/SeeedDocument/Grove-315MHz_RF_Kit/master/res/1110010P1.pdf)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://learn.pakronics.com.au/seed-studio/grove-modules/actuator/grove-315mhz_rf_kit.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.