This project uses an RF circuit with a PIC16F877A microcontroller to wirelessly control power line devices. The RF circuit transmits signals from a remote transmitter to a receiver where the PIC microcontroller monitors for signals and controls appliances accordingly. When inputs are pressed on the remote, the parallel signals are encoded and transmitted to the receiver where a decoder converts them back to parallel signals to control devices. The microcontroller runs programs to receive signals and toggle appliance outputs based on the received codes.

2. WELCOME 
A WARM
TO
ALL

3. M.RAMA CHANDRA RAO

4. RF CONTROL FOR POWER LINE DEVICES

5. Introduction
 This Project “RF CONTROL FOR POWER LINE DEVICES” using
“PIC16F877A” is a reliable circuit that takes over the task of controlling the
Appliances and after checking and giving the output which we were giving
will perform very accurately and efficiently.
 The total number of inputs that which we are giving is taking and giving
the output accurately. The PIC Microcontroller does the above job. It
receives the signal from the Transmitter section and sent to receiving
section and the control of the Software is done through the Software
which we have stored in ROM.
 Microcontroller PIC16F877A continuously monitors and keeps on checking,
whether any signal is passing through the RF modules Section.

6. BLOCK DIAGRAM OF RF:

7. PROCESS OF RECEIVING & TRANSMITTING SECTION:

8. DESCRIPTION OF RF BLOCK DIAGRAM:
 The above Block diagram describes that when the input is given
then the given signals which we are giving is parallel signals that
parallel signals is encoded as Series and transmitted to the
receiver through the Transmitter. That transmitted signals are
again Decoded through the Decoder Ic and the parallel signals are
again decoded in to Parallel signals. Then the Home appliances
can be controlled as Wireless through the Remote.

9. PIN CONFIGURATION OF RF:

10. ENCODER:
• An encoder is a device, circuit, transducer,
software program, algorithm or person
that converts information from one format
or code to another, for the purposes of
standardization, speed, secrecy, security
or compressions.

11. DECODER:
• A decoder is a device which does the reverse operation of
an encoder, undoing the encoding so that the original
information can be retrieved. The same method used to
encode is usually just reversed in order to decode. It is a
combinational circuit that converts binary information from
n input lines to a maximum of 2n unique output lines.
• A 2-to-4 line single-bit decoder
• In digital electronics, a decoder can take the form of a
multiple-input, multiple-output logic circuit that converts
coded inputs into coded outputs, where the input and
output codes are different. e.g. n-to-2n, binary-coded
decimal decoders. Enable inputs must be on for the decoder
to function, otherwise its outputs assume a single
"disabled" output code word. Decoding is necessary in
applications such as data multiplexing, 7 segment display
and memory address decoding

12. CIRCUIT DIAGRAM

13. HARDWARE CONNECTION OF OUR PROJECT:

14. HERE WE HAVE
WRITTEN &
USED 2 ASM
PROGRAMS

15. 1

16. • list p=16f877a
• #include<p16f877a.inc>
• __CONFIG 0x3F7A;CONFIGERATION BITS
• ORG 000H
• GOTO MAIN
• ORG 0AH
• MAIN:
• CLRF PORTB
• CLRF PORTD
• BSF STATUS,RP0
• CLRF TRISD
• MOVLW 0FFH
• MOVWF PORTB
• BCF STATUS,RP0

17. • LOOP:
• BTFSS PORTB,0
• BSF PORTD,0
• BTFSS PORTB,1
• BSF PORTD,1
• BTFSS PORTB,2
• BSF PORTD,2
• BTFSS PORTB,3
• BSF PORTD,3
• BTFSS PORTB,0
• BCF PORTD,0
• BTFSS PORTB,1
• BCF PORTD,1
• BTFSS PORTB,2
• BCF PORTD,2
• BTFSS PORTB,3
• BCF PORTD,3
• GOTO LOOP
• END

18. PIC16F877

19. PIC:
• A PIC Microcontroller is a single integrated
circuit small enough to fit in palm of a hand.
• In PIC Microcontroller some EPROM program
memory chip, some RAM memory and i/p o/p
interface .
• All these functions are included with in one
single package, making them cost effective
and easy to use.

20. PIC
16F87X
RAM FLASH PSP
EEPROM CCP LCD
I/O PORTS ICSP
TIMER/COUNTER SSP
USART ADC
Special
features
PIC

21. PIN CONFIGURATION

22. WORKING OF HARD WARE

24. ANY QUERY ?