Network Control Unit ncu

8/8/2019 Network Control Unit ncu

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Network Control Unit

By:-Ujjwal Prakash Singh

Vidhan BhandariVirendra Singh Rathore

Vineet Jain





Project Scope

The objectives of this project include:

To develop schematic of a general purpose board

for automation that includes Ethernetcontrollability.

The board must include 4 Opto-Isolated inputs, 2

Ana-log inputs, 4 Relay driven outputs, that canbe used for various control applications.



Picdem.net2



Cont

The PICDEM.net 2 Development Board has all thefeatures to begin developing Internetconnectivity applications over an Ethernet

connection. The preprogrammed firmware allowsusers to begin evaluating the board right out of the box with no additional programming orconfiguration. All that is required to begin

exploring the board is a network-enabledcomputer with an Ethernet adapter and Internetbrowser software.



Product Features

This product is a powerful, aesthetic and userfriendly system that gives the user completefreedom to explore various functionalities of automation. In order to do this, we havedeveloped our product on a platform called thePICDEM.net 2 development board. With the greatexpandability and versatility of the PICDEM.net 2Board and PIC18F97J60 processor, we have been

able to incorporate many external devices andcreate a system that is capable of collecting,processing, displaying, and controlling all of theinformation just with a touch of a button.



Cont

Functionalities incorporated from PICDEM.net 2 :

Microchip PIC18F97J60 microcontroller.

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

Ethernet Interface(RJ-45 connector).

Connector for future expansion(Like PIC tail)

ICSP/MPLAB ICD2 interface connector for in circuitprogramming and debugging.

RS-232/RS-485 interface.

Real Time clock.



Functional Analysis of Board



System Features



1.Microcontroller (PIC18F97J60)

It is a feature rich PIC18 Microcontroller with an

integrated 10Mbps Ethernet communications

peripheral. This single-chip solution is ideal for

applications requiring remote control and

monitoring. Target applications include

Industrial Automation, Building Automation,

Home control, Security and Instrumentation.



Features of PIC18F97J60

Features:-

IEEE 802.3 compatible Ethernet Controller

Fully Compatible with 10/100/1000Base-T networks

Integrated MAC and 10BASE-T PHY

Up to 128KB Flash Memory

8 KB Ethernet Buffer

Support for Unicast, Multicast and Broadcast packets

Unicast, Multicast, Broadcast, specific packet match or any packet 64/80/100-Pin TQ FP Package

Temperature Range: -45°C to + 85°C



Cont.

Parameter Name Value

Program Memory Type Flash

Program Memory (KB) 128

CPU Speed (MIPS) 10.5

RAM Bytes 3,808

Capture/Compare/PWM Peripherals 2 CCP, 3 ECCP

Timers 2 x 8-bit, 3 x 16-bit

ADC 16 ch, 10-bit

Comparators 2

Ethernet 10 Base T

Temperature Range (C) -40 to 85

Operating Voltage Range (V) 2 to 3.6

Pin Count 100



2.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 electricallyisolated²since the electrical signal is converted to a light beam, transferred, then converted back to an electricalsignal, there is no need for electrical connection betweenthe 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 changingconditions in the real world. When we want to measure these variably

changing conditions, we need analog inputs to convert these changing

real world conditions to changing electrical quantities. In such cases,we can use one of our analog input 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 a measurable electrical signal with a

defined range. The analog input changes continuously in a definable

manner in relation to the measured property. This data is very useful for process monitoring, process control, or simple monitoring / datacollection and acquisition.



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.





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 at5.5V, 10 MHz - Read Current: 6 mA at 5.5V, 10 MHz - StandbyCurrent: 1 A at 5.5V

32,768 x 8-bit Organization 64-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

R50100K

JP15

12RD7



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TO ¡ ¢ B9

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10

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0

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x¢



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ype

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T

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5V



Input

Analog input

1

2 3

4

73

5

J6 7

8

8

7

9 N7

9

@

N7

8



Application

Home automation in the field of lighting

system , temperature sensing , humidity

sensing and various other types of sensing as

per industrial needs.







CONCLUSION

Automation is undeniably a resource which can make ahome/industrial environment automated. People cancontrol their devices IN INDUSTRY OR HOME via thisgeneralised board and set up the controlling actions in

the computer. This board is capable of sensing theenvironment, scheduling the equipments, sendingalerts. The board is provided with Ethernetcontrollability which can be utilized to control thesystem remotely.

Further expansion of the device will surely be able towithstand the needs of the future and may includewireless capabilities.



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/Home Automation%20Report.pdf [7] PIC 18F97J60

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

Documents

Network Control Unit ncu