network control unit

8/7/2019 Network Control Unit

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Network Control Unit



Team Members-

o Deepak Achariya

o Mahesh Rawal

o Virendra S. Rathoreo Vidhan Bhandari

Faculty Guide-

Mr. Amrit Ghosh

Mr. Shashikant Dargar

Ms.Shilpi Birla

Mr. Rajesh Ishwar

Technical Guide-

Mr. Casper Ehrenborg

Ehrenborg Teknikutveckling AB

o Ujjawal Prakash

o Apoorv Upadhyay

o

Kartik Parmar o Vidhan Bhandari



System Requirement Scheme

The system requirement proposal had gone through

many phases right from the construction of a home

automation system to the industrial automation

system .After that we were asked to construct a generic automation system that can be controlled via

the ethernet and finally it landed in the development

of a generic board that can be used as network

control unit.



AIM

The purpose of this project is to develop a

general purpose board that make use of

Microchips PIC18F97J60 microcontroller for

automation purposes.



Project Scope

The objectives of this project include:

To develop schematic of a general purpose board for

automation that includes Ethernet controllability.

The board must include 4 Opto-Isolated inputs, 2

Analog inputs, 4 Relay driven outputs, that can beused for various control applications.



Picdem.net2



Cont

The PICDEM.net 2 Development Board has all the

features to begin developing Internet connectivity

applications over an Ethernet connection. The

preprogrammed firmware allows users to beginevaluating the board right out of the box with no

additional programming or configuration. All that is

required to begin exploring the board is a network-

enabled computer with an Ethernet adapter and Internet browser software.



Picdem.net2



Cont

Functionalities incorporated from PICDEM.net 2 :

Microchip PIC18F97J60 microcontroller.

Web server with HTML support. Microchip free TCP/IP stack.

Ethernet Interf ace(RJ-45 connector).

Connector for future expansion(Like PIC tail)

ICSP/MPLAB ICD2 interf ace connector for in circuitprogramming and debugging.

RS-232/RS-485 interf ace.

Real Time clock.



Functional Analysis of Board



System Features



1.Inputs

1. OPTO-ISOLATED INPUT

An opto-isolator (or optical isolator, optical couplingdevice, optocoupler, photocoupler, or photoMOS) is adevice that uses a short transmission path to transfer anelectrical signal between elements of a circuit, typically atransmitter and receiver, while keeping them electrically

isolated²since the electrical signal is converted to a light beam, transferred, then converted back to an electricalsignal, there is no need for electrical connection between the

source and destination circuits.



Cont.

Schematic diagram of a very simple opto-

isolator with an LED and phototransistor.



Cont.

2.ANALOG INPUT

Analog input boards are useful for measuring variably changing conditions inthe real world. When we want to measure these variably changing conditions,we need analog inputs to convert these changing real world conditions tochanging electrical quantities. In such cases, we can use one of our analoginput devices to convert the electrical data from a sensor or transducer into binary data that can then be used by our board. An analog input is ameasurable electrical signal with a defined range. The analog input changes

continuously in a definable manner in relation to the measured property. Thisdata is very useful for process monitoring, process control, or simplemonitoring / data collection and acquisition.



Power supply

For the ease of different voltage regulation on board we have come up

with the following ICs:-

1. LM2940

2. TC1262



Cont.

3. MAX 3232

The MAX3232 transceivers have a proprietary low-dropout transmitter

output stage enabling true RS-232 performance from a 3.0V to 5.5Vsupply with a dual charge pump. The devices require only four small0.1F external charge pump capacitors.

The MAX3232 have 2 receivers and 2 drivers. The MAX3232 is

guaranteed to run at data rates of 120kbps while maintaining RS-232

output and features a 1A shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers

remain active in shutdown mode, allowing external devices such asmodems to be monitored using only 1A supply current.



Cont.

4. MEMORY

The Microchip Technology Inc. 25AA256/25LC256 (25XX256*) are

256 Kbit Serial Electrically Erasable PROMs. The memory is accessedvia a simple Serial Peripheral Interface (SPI) compatible serial bus. The

bus signals required are a clock input (SCK) plus separate data in (SI)

and data out (SO) lines. Access to the device is controlled through aChip Select (CS) input. Communication to the device can be paused via

the hold pin (HOLD). While the device is paused, transitions on its

inputs will be ignored, with the exception of Chip Select, allowing the

host to service higher priority interrupts. The 25XX256 is available instandard packages including 8-lead PDIP and SOIC, and advanced

packaging including 8-lead DFN and 8-lead TSSOP



Features Of Memory

High Reliability: - Endurance: 1,000,000 erase/write cycles - Dataretention: > 200 years - ESD protection: > 4000V

Max. Clock 10 MHz

Low-Power CMOS Technology: - Max. Write Current: 5 mA at 5.5V,10 MHz - Read Current: 6 mA at 5.5V, 10 MHz - Standby Current: 1A at 5.5V

32,768 x 8-bit Organization64-Byte Page

Self-Timed Erase and Write Cycles (5 ms max.)Block Write Protection: - Protect none, 1/4, 1/2 or all of array

Built-In Write Protection: - Power-on/off data protection circuitry -Write enable latch - Write-protect pin



Cont.

Parameter Name Value

Density 256 Kbit (x8)

Max. Clock Freq. 10 MHz

Page Size (bytes) 64

Write Protect Quarter, Half, Whole Array

Endurance 1,000,000

Op. Volt Range (V) 2.5 to 5.5

Temp Range (°C) -40°C to +150°C



FABRICATION

OF

PCB



PCB of required size

Imprint of PCB layout on transparent sheet

Exposure of photoresist

Development of film

DIP coating



UV Exposure

Developer

Etching

Scrubbing



Tin Coating

Drilling

Mounting/Soldering



LAYOUT



Memory

U18

AT25256

SO2

SI5

VCC8

CS1 WP3 HOLD7

SCLK6

SDI1

SCK1

SDO1

C72

1u

03.3V

3.3V

0

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Input

Analog input

A

B C

D

E C

F

G

H I

P

P

I

Q R

I

Q

S

R

I

P



Opto-Isolated Input



Output

Relay driven output



Application

Home automation in the field of lighting

system , temperature sensing , humidity

sensing and various other types of sensing as

per industrial needs.



Future Advancements

The wireless connectivity can be provided to

the board.

A webserver can be prepared and hosted on

the board.



CONCLUSION

Automation is undeniably a resource which can make a home/industrial environment

automated. People can control their devices in

INDUSTRY or HOME via this generalised board and set up the controlling actions in thecomputer. This board is capable of sensing theenvironment, scheduling the equipments ,

sending alerts. The board is provided with Ethernet controllability which can be utilized to control the system remotely.



REFERENCES [1] PICDEM.net 2 Development Board

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET _PAGE&nodeId=1406&dDocName=en028217

[2] TCP/IP Solutions

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET _PAGE&nodeId=1489

[3] TC1262 - 500mA Fixed Output CMOS LDO

ww1.microchip.com/downloads/en/devicedoc/21373b.pdf

[4] LM2940 - 1A Low Dropout Regulator

www.national.com/ds/LM/LM2940.pdf

[5] 25LC256 MICROCHIP - 256K SPI Bus Serial EEPROM

ww1.microchip.com/downloads/en/DeviceDoc/21822F.pdf

[6] C halmers home automation

http://web.student.chalmers.se/groups/uc081/document/HomeAutomation%20Report.pdf

[7] PIC 18F97J60

ww1.microchip.com/downloads/en/DeviceDoc/39762a.pdf

network control unit

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