In this project, I will show you how to design an RF Remote Control Circuit for home Appliances. Using this circuit, you can control simple home appliances with the help of an RF Remote control.
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Introduction
We have already learned in an earlier post about how thiết kế IR Remote Control for home Appliances. But, have you ever tried lớn design wireless communication circuit without any microcontroller? This article explains you how lớn control the trang chủ appliances wirelessly using RF technology.Here is the menu of trang chủ automation projects using different technologies.
Here we have used RF434 MHz modules lớn make wireless remote. Using this remote, we can control the appliances within the range of 100 meters. This project has two sections, one is transmitter section và the other is receiver section. At transmitter section, we use HT12E encoder và at receiver section, we use HT12D decoder.
RF Remote Control Circuit Principle
When we press any key in the remote, the transmitter section generates the corresponding RF signal & this signal is received by the receiver section, hence it switches the corresponding appliance.
A four channel encoder/decoder pair is used in this system. The input đầu vào signals at the transmitter section are taken from the four switches và the output đầu ra signals at the receiver are indicated by the four LED’s corresponding lớn each switch.
Here, the encoder HT12E is used to convert parallel data to lớn serial. This data is transmitted serially to lớn receiver point through RF.
RF receiver receives the data serially and then gives to lớn the HT12D decoder to convert it to lớn the parallel. Four LEDs indicate the received data.
Circuit Diagram of RF Remote Control for home Appliances without using Microcontroller
HT12E encoder ICHT12D decoder ICRF 434 MHz transmitter and receiver
Resistors – 33KΩ, 750KΩ, 1KΩ, Relay Module
Lamp
Connecting Wires
Breadboards
Also get an idea about How FM Remote Encoder/Decoder Circuit Works for trang chủ Appliances.
Circuit DesignHT12E Encoder
This encoder IC is integrated 2^12 series of encoders. This IC is mainly used to lớn interface RF và IR circuits. This IC converts 12 bit parallel to serial. These 12 bits are divided into 4 data bits and 8 address bits.
This IC has transmitter enable pin. When trigger signal is received on this pin, the address và data bits are transmitted together. HT12E starts a 4 word transmission cycle upon receipt of enable. The transmission cycle is repeated till transmitter enable is kept low.
HT12D Decoder
This decoder IC converts serial input đầu vào data to lớn parallel. This IC indicates valid transmission by a high at VT (Valid Transmission) pin.
HT12D is capable lớn decode 12bit data (8 address bits & 4 data bits). The output đầu ra data remains unchanged till the new data is received.
It is mainly used in RF and IR circuits. These decoders are mainly used for remote control applications like burglar alarm, oto door alarm, security system etc.
The chosen pair of encoder and decoder for communication should have same number of address and data bits.
RF Modules (434MHz)
This module operates at radio frequency. The Radio frequency range is 30 KHz to lớn 300 GHz. In this system, RF modules use ASK (Amplitude Shift Keying) modulation.
Transmission through RF is better than IR because, the RF signal can travel for longer distances as compare lớn infrared. & IR mostly supports line-of-sight mode, RF signals can travel even there is an obstruction. RF transmission is more reliable và stronger as compare khổng lồ IR.
The chosen pair of RF Transmitter and receiver should have same frequency. The transmission tốc độ of these modules is 1Kbps khổng lồ 10Kbps.
How khổng lồ Operate this RF Remote Control Circuit?
Connect the circuit as shown in the diagram.Apply 9V supply to the transmitter và receiver sections.Press the button at transmitter section; you can observe that the Lamp connected lớn the relay at the receiver section will turn ON. Now disconnect the nguồn supply from transmitter & receiver sections.NOTE: By default, the data transmitted is HIGH và when the button is pushed, LOW is sent. Since the relay module used here is an Active LOW relay, normally, the lamp stays OFF (as HIGH signal is receiced) and when the button is pressed, it turns ON (as LOW signal is received và relay is activated).
RF Remote Control Circuit Advantages
Works for longer distances as compared to lớn IR.RF signals can travel even there is an obstruction between transmitter and receiver.Xem thêm: Thịt Đậu Sốt Cà Chua - Cách Làm Đậu Hũ Sốt Cà Chua Thơm Ngon Đậm Vị
RF Remote Control Circuit Applications
Used for remote control applications lượt thích burglar alarm, oto door alarm, calling bell, security systems, etc.Limitations of the Circuit
The mode of communication is complex.It is better lớn use a microcontroller based system| Model Name | PHONE REMOTE CONTROL |
| Color | Red |
| Types of Devices Controlled | TV, công nghệ bluetooth Devices, Fan |
| Compatible Brands | ALL KINDS OF home APPLIANCES CAN BE CONTROLLED |
| Sales Package | 1 TYPE-C PORT pendrive |
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