RF Module

Criteria:

Using the RF transmitter and receiver 433MHz RF Transmitter/Receiver Module

Using two Arduinos, create sketches to transmit a 12-character string containing one number with a leading ‘X’ and padded with ‘Z’. The receiver should display the numbers and indicate whether the number is even or odd.

Example: The transmitter might send “X13ZZZZZZZZZ” and the receiver would display (on the serial monitor) “13 is odd”

These sketches allow for data to be transferred from one arduino to another arduino nearby. This is useful for the rover as an arduino connected to the computer can send information to the rover which has an arduino connected to it.

Required Hardware

2 Arduino Unos
6 jumper wires
1 breadboard
1 433MHz RF Transmitter
1 433MHz RF Receiver
2 USB Cables
2 Computers with Arduino IDE

Required Libraries

RadioHead Library Download Here
SPI.h (included in Arduino IDE)

Useful Links

Link to buy sensors Here

Link to programming tutorial Here

Wiring Diagram

Transmitter sketch to send data to the receiver

#include RH_ASK.h
RH_ASK driver;
void setup()
{
Serial.begin(9600);
if (!driver.init())
{
Serial.println("init failed");
}
}
void loop()
{
// int number = random(0, 100);
String message = "X";
// message += String(number, DEC);
int padding = 12 - message.length();
for (int i = 0; i < padding; i++)
{
message += "Z";
}
const char *msg = "X14ZZZZZZZZZ";
// const char *msg = message.c_str();
driver.send((uint8_t *)msg, strlen(msg));
driver.waitPacketSent();
delay(1000);
}

Sketch to receive data from the transmitter

#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);
}
}