RF Modules

1. Definition

RF (Radio Frequency) Modules are used for wireless communication between devices using radio waves.
They typically operate at frequencies like 315 MHz, 433 MHz, 868 MHz, or 2.4 GHz, and can be simple transmitter-receiver pairs or more advanced transceivers.

RF Module transmitter and receiver

2. Types of RF Modules

RF Transmitter & Receiver Pair (e.g., 433 MHz) Basic unidirectional communication.
RF Transceiver (e.g., nRF24L01) Supports two-way communication.
Long-Range RF Modules (e.g., LoRa) Communicate over several kilometers with low power consumption.

3. Applications

Remote control systems (cars, doors, lights).
Wireless sensors (temperature, humidity, security alarms).
IoT devices for short- or long-range communication.
Robotics for remote operation.

4. Example Circuit

433 MHz RF Module with Arduino:

Transmitter Side: Arduino → RF Transmitter → Antenna.
Receiver Side: RF Receiver → Arduino → Output (LED, Buzzer, etc.).

#include <VirtualWire.h>

void setup() {
  vw_setup(2000); // Bits per second
  vw_set_tx_pin(12); // Transmitter connected to D12
}

void loop() {
  const char *msg = "Hello";
  vw_send((uint8_t *)msg, strlen(msg));
  vw_wait_tx();
  delay(1000);
}

5. Video Explanation

video coming soon