Control over power line
Prepared by :-
     Ra’fat  Ghanem
     Mostafa Atrash
     Yahya Hamarshi
Supervisor :-
      Dr. Samer Mayaleh









Content
Introduction.
What is our project?
Human interface.
Project concept and design.
MCU’s and programming.
Problems and recommendations.










Introduction :

What is PLC?
 it’s a method using the power line to transfer data over it

Objective of PLC
It’s a telecommunication system use the existing power network to transfer data over it .

The aim of our project
To control devices using the PLC telecommunication system







Block Diagram








Human interface
C# interface
Flow chart 









Video








Coupling circuit 
- It’s used to inject the message over the power signal.

It construct from:
   1- coupling transformer to inject the modulated message over power signal.
   2- high pass filter to filter the message from the power signal.
   3- low pass filter to filter the message from the  harmonics of the modulated frequency. 









LPF
HPF
LPF



PA
Power line
L1    N   

Tx

Rx



















PCB Coupling cct 








FSK transceiver 
This part is implemented by FSK st7540 and use to modulate the out coming signal and demodulate the incoming signal.

 It support 8 programmable frequency (132.5KHz)
 baud rate up to 4800bps (2400bps)
 the operating frequency
          F(“0”)= Fcarrier +∆F/2 =131836Hz
          F(“1”)= Fcarrier - ∆F/2  =133138Hz 









FSK Block diagram 

Serial interface
modulator
demodulator

PA
RxD
TxD
Tx-out
Rx-in
PA-out
Reg/Data
      RxTx








12

PCB FSK cct








FSK can access in tow modes
2- Control access mode
     access in synchronous mode only 
     construct from 24 bit programmed serially






1- Data access mode 
     Synchronous data access
     Asynchronous data access 










Transmuted received and modulated data










Transmitter MCU







Receiver MCU








PCB MCU cct








Controlling motor by PWM
Derived by H-bridge 
Controlled by MCU over PL’s.
 









Additional tips
creating a network using can system 
  this system use can bus to exchange data between units.
  this system use data link layer which consists from 	arbitration control and data field.
  give each unit an ID
  when two nodes are send at the same time the node that 	win the arbitration send its data over the bus.
  this system use the SPI protocol to communicate with 	MCU 
   SPI test between two MCU will succeed
 










Problems and suggestions 

 No SPI response between can system and MCU 
	Try to use another MCU instead of PIC16 that 	support can system as PIC18Fxxx, or PIC18Cxxx.

The difficulty to obtain hardware components 
  Make sure that all project components are 	available in the local market.
  Make sure you have backup.

The difficulty to deal with the mounted service 	components as FSK.















Thanks for your attention 

Any question ?










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