RF 모듈 MultiChannel

졸업작품의뢰 링크(▶LINK)

1:N 통신이 필요할경우 RF통신이 필요하다.

Naver

Naver

ht12d

ht12e working

ht12e

http://www.circuitsgallery.com/2013/05/multi-channel-remort-control-system.html

Here is a hobby circuit of a multi channel remote control system, 

by which you can control 8 different appliances. 

The main sections of this multi channel remote control circuit 

are the RF receiver and transmitter.

여기 취미로만든 회로가있다. of a 다중 채널 원격제어 시스템의,

by which 네가 can 제어할수있는 8개 전자제품들에 의해.

The 주 섹션들 of 이 다중 채널 원격 제어 회로의

은 the RF 송수신이다.

By using this circuit

we can control 8 devices, 

each of them independently by pressing the push buttons.

When the button is pushed, 

corresponding relay is turned ON and is turned OFF on the next push.

By 사용함으로써 이 회로를

우린 can 제어할수있다. 8개 devices들을,

each of them 개별적으로 by 누름으로써 the 푸시 버튼들을.

when the 버튼이 눌렸을때,

상응하는 릴레이들이 켜진다. ON으로 and is 꺼진다. OFF로 on the 다음 버튼상에서.

Here the relay load current is dependent on the relay used. 

A serial encoder IC HT12E 

and 

a serial decoder IC HT12D are used, 

where the encoder IC encodes the parallel data to serial 

and decoder IC decodes the serial data to parallel 

during the wireless transmission.

You must need a regulated power supply of 5 volt for this circuit because ICs 7476 and 74138 requires 5v for its operation.

The main advantage of this system is that it does not require a ‘line of sight’ as compared to IR remote control systems

; also it gives longer distance control.

RF Transmitter

RF Reciever

Device driver

Components

1.RF Transmitter Module 434Mhz

2.RF Receiver Module 434Mhz

3.IC HT12E

4.IC HT12D

5.IC 7476 4Nos

6.IC 74138

7.Push button 8Nos

8.Relay 12V,10A 8Nos

9.IC 74174

10.Transistor BC548

11.Resistor (750K,33K,1k 8Nos)

Working

●Maximum voltage of TTL ICs is 5v. 

So we are using a 7805 voltage regulator IC which provides 5V output.

●74147 is the priority encoder IC 

which generates the BCD corresponding to the pressed switch.

●It is given to the serial encoder IC HT12E 

which converts the parallel BCD value 

to corresponding serial data 

to transmit through the RF transmitter.

●The RF Transmitter transmits the serial data 

and RF receiver receives the serial data, both operates on 434Mhz.

●It is given to the serial decoder IC HT12D 

which converts the serial data to parallel.

●It is again decoded by a 3 to 8 decoder IC 74138 to operate the relay.

●Output of 74138 is the clock of JK flip flop IC 7476 

which operates in toggling mode. 

(i.e. if one clock is received it inverts the output, thus it turns OFF the relays)