RF Wireless 315 / 433 MHz Transmitter & Receiver Module Pair

Receiver Module Specifications:

• Operating Voltage: DC 5V
• Quiescent Current: 4mA
• Receiving Frequency: 315MHz or 433.92MHz (select above)
• Receiver sensitivity: -105DB
• Antenna: 32cm solid core spiral wound
• Pinout from left → right: (VCC, DATA, GND)

Transmitter Module Specifications:

• Launch distance: 20 - 200 meters (higher voltage yields better results)
• Operating voltage: 5V
• Operating mode: AM
• Transfer rate: 4KB / S
• Transmitting power: 10mW
• Transmitting frequency: 315MHz or 433MHz
• Antenna: 25cm solid core spiral wound
• Pinout from left → right: (DATA, VCC, GND)

Connect RF Receiver Module with Arduino  (randomnerdtutorials)

Here’s the library you need for this project:

1. Download the RadioHead library
2. Unzip the RadioHead library
3. Install the RadioHead library in your Arduino IDE
4. Restart your Arduino IDE

The RadioHead library is great and it works with almost all RF modules in the market. You can read more about this project here

Receiver Circuit

Follow the circuit above for your receiver. Then upload the code below.

#include <RH_ASK.h>
#include <SPI.h> // Not actualy used but needed to compile

RH_ASK driver;

void setup()
{
    Serial.begin(9600); // Debugging only
    if (!driver.init())
         Serial.println("init failed");
}

void loop()
{
    uint8_t buf[12];
    uint8_t buflen = sizeof(buf);
    if (driver.recv(buf, &buflen)) // Non-blocking
    {
      int i;
      // Message with a good checksum received, dump it.
      Serial.print("Message: ");
      Serial.println((char*)buf);         
    }
}

Follow the circuit above for your transmitter. Then upload the code below.

#include <RH_ASK.h>
#include <SPI.h> // Not actually used but needed to compile

RH_ASK driver;

void setup()
{
    Serial.begin(9600);   // Debugging only
    if (!driver.init())
         Serial.println("init failed");
}

void loop()
{
    const char *msg = "Hello World!";
    driver.send((uint8_t *)msg, strlen(msg));
    driver.waitPacketSent();
    delay(1000);
}

Demonstration

In this project, the transmitter is sending a message “Hello World!” to the receiver via RF. Those messages are being displayed in the serial monitor from the receiver. Here’s what you should see in your Arduino IDE serial monitor.