The circuit diagram for RF transmitter using Arduino Nano is given below. The amplified signal is then fed to a PLL (Phase Lock Loop) which enables the decoder to “lock” onto a stream of digital bits which gives better-decoded output and noise immunity. A couple of OP-Amps are used to amplify the carrier wave received from the transmitter. It consists of an RF tuner circuit, OP Amps, and a PLL. Even though it looks complex, it is as simple as the transmitter module. Transmission range: 90m (in open space).Working current: max Less than 40mA, and min 9mA.This technique is called Amplitude Shift Keying (ASK). When a logic HIGH is given as the DATA input, the oscillator is ON and produces a constant RF output carrier wave at 433.xx MHz and when the DATA input is logic LOW, the oscillator is OFF, so no carrier is produced. There is a switching transistor and a few passive components on it. The SAW resonator which is tuned for 433.xx MHz operation is the heart of the module. So here we are starting with a introductory Article about RF modules and how RF modules can be used with Arduino to send and receive data. RF communication is used in Mobile communication and can have long rage communication and that’s what make them suitable for building IoT based applications. It is used in various areas like Remote lighting controls, long-range RFID, wireless alarm and security systems etc. The low power consumption makes them ideal for battery- based implementations. These modules are used for short range, low- budget, simplex-based communication.

RF signals can travel between transmitter and receiver even when there is an obstruction. These RF modules operate at a specific frequency of 433MHz.

The receiver receives the data through an antenna and gives the data to the microcontroller connected to it. The RF transmitter receives serial data from a microcontroller and transmits it to the receiver through an antenna connected to the 4 th pin of the transmitter.

The data is sent serially from the transmitter and is received by a tuned receiver. The transmitter and receiver are needed to be interfaced with microcontrollers for data transfer.

Virtual wire library maximum data rate