Arduino send values wirelessly using RF module

This method can be used to send and receive numeric values or integers over a short distance from one Arduino microcontroller to another.

Refer: RF ASK wireless communication; includes – Radiohead library installations, Tx and Rx circuit & code to send data as a character array.

Here the variable that the value is assigned is an unsigned 16-bit integer,  this value can be easily used for further calculations or to apply in any functions as the data type is an integer.

Refer to the page of Radiohead library which details about sending sensor data using ASK RF module.

In the given transmitter circuit, the variable terminal of the potentiometer is connected to the Analog read pin A0 of the Arduino. The transmitter sends the instantaneous analog read values as serial binary data by the method of amplitude shift keying. It is then received and displayed in the serial monitor of the receiver Arduino. This is an useful option to wirelessly send values like sensor readings, measurements, output values, etc. Also, multiple receivers in the transmission range can simultaneously receive these values.

Transmitter code

#include <RH_ASK.h>
#include <SPI.h>

int state = 0;
RH_ASK driver;

void setup()
{
driver.init();
}

void loop()
{
   uint16_t data = analogRead(A0);
    driver.send((uint8_t *)&data, sizeof(data));
    driver.waitPacketSent();
    delay(200);
}

In the above code, just assign the variable named “data”with any value or integer that needs to be sent.

Receiver code

#include <RH_ASK.h>
#include <SPI.h>

RH_ASK driver;

void setup()
{
  Serial.begin(9600);
  driver.init();
}

void loop()
{
  uint16_t data;
  uint8_t datalen = sizeof(data);
  if (driver.recv((uint8_t*)&data, &datalen))
  {
    Serial.println(data);
  }
}

Here the transmitter and receiver continuously send and receive the data. The code can be simply modified to different functions, like changing the time delay to get reading between fixed intervals of time, adding conditions to send readings only when reaching a threshold value, etc.