RF Transmitter and Receiver Circuit
Making our projects wireless always looks cool and increases the range over which they can be controlled. There are numerous ways to control something wirelessly, ranging from a standard IR LED for short-distance wireless control to an ESP8266 for worldwide HTTP control. We will learn how to build wireless projects with a 27 MHz RF module in this project. These modules are inexpensive for their functions and widely available. They can be used as stand-alone Transmitters and Receivers, or they can be interfaced with an MCU/MPU such as the Arduino or Raspberry Pi. We'll go over the fundamentals of the RF module and how to use it as a standalone RF Transmitter and Receiver. By controlling the LEDs wirelessly with RF, we have explained
RF Transmitter and Receiver Module:
theRF Transmitter and Receiver Circuit.
Before we begin, let me give you a quick rundown of these RF modules. RF stands for "Radio Frequency," and an RF transceiver module always works in pairs, requiring a Transmitter and a Receiver to send and receive data. Data can only be sent from one end to the other because a
Encoder and Decoder modules are not required for the RFmodules to function. Simply turn on both modules using the above-mentioned voltage. However, there is a significant disadvantage to this method. On the sender side, there can only be one button and one output on the receiver side. This is not going to help us build better projects, so we use the encoder and decoder modules.
Need for Encoder and Decoders:
The Address bits A0 to A7 on the Encoder and Decoder ICs are both grounded. They will act as a pair because they share the same address. D8 to D11are data pins connected to push buttons on the Encoder side and LEDs on the Decoder side. When a button on the encoder side is pressed, information is transferred to the decoder and the corresponding light is toggled.
As you can see, the RFTransmitter Circuit is made up of the Encoder IC, and the RFReceiver Circuit is made up of the Decoder IC. Because the transmitter does not require a regulated 5V, it is powered directly by a 9V battery. On the receiver side, a 7805 +5V voltage regulator was used to regulate 5V from the 9V battery.
The HT12D and HT12E are encoder and decoder modules with four data bits. This means we can create 16 different input/output Thesecombinations.are18-pin integrated circuits with an input voltage range of 3V to 12V. They have four data bits and eight address bits, which must be set the same on both the encoder and decoder to work as a pair.
Data pins are hard-wired in the experiment by connecting to switches at the transmitter end and L EDs at the receiver end, but they can be connected to microcontrollers or other logical circuits to use RF transmission in a real-life application. Remote-controlling a robot or a group of robots, contact-less RFsmartcard or radio tag reading, wireless data acquisition from a remotely installed sensor, remote message transmission to a display device, area paging, wireless home automation using multiple receivers connected to home appliances and a single remote having an RF transmitter, telemetry, Access Control System (Like remote controlled door), etc.
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Working of RF Controlled LEDs:
This experiment is a simple RF transmission demonstration using HT12E/HT12D ICs and RFmodules. In the experiment, a single pair of RFtransmitter and receiver modules are However,used. any number of receivers or transmitters can be configured to receive data from a single transmitter module or to transmit data to a single receiver. The only requirement is that the addresses at the encoder of the transmitter and the decoder of the receiver modules match. By allowing the addresses of transmitter and receiver modules to be changed, a complex RF data network system can be formed.
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