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SrNo Device Description Type part No

1 Display GLCD 128x64 Mono-Color

2 Controller Microchip Contorller DIP-40 PIN PIC18f44k22

3 Keypad Matrix 3x2 6 Keys

3 Key without matrix

4 Sensor PT100 0-400

5 Photo Diode HIGH-LOW Signal

6 ADC ILC7135

7 EEPROM at24c64

8 RTC DS1307

9 Serial Communication MX232

Total 9 Keys

The purpose of this project is to control the Temperature with desired ramp rate selected

by the user. On heating the chamber in that chamber the sample tube will place as

temperature rise the sample melt at certain point the system will get the signal through

photo-diode or the user will manually press the key MELT1,MELT2 or MELT3 . So on

getting the signal the system will hold the particular temperature and store into the

EEPROM.

Project Overview

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Keypad

MENU UP DOWN

ENTERSTART RESET

MELT1 MELT2 MELT3

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Menu Screen

1

23

64

51. Set the current Date/Time

2. Sample Selection Know or Unknown

3. Temperature Calibration ::There will be the 5 point temperature calibration.

In 5 Point Calibration the user will manually put the temperature as per the following:

Standards System Readings

100 105

200 250 Like wise other 3 stages:

4. Other settings :: Like Saving the sample names. Will provide the information later

5. Temperature Ramp Rate Setting: 5 five setting of ramp rate

1. 0-100

2. 100-150

3. 150-250

4. 250-300

5. 300-400

Ramp Rate is Rate of change of temperature per minute. This will be controlled by

PID.

6. Stored and Printing optionsa. Reading the saved data on LCD .

b. Sending the data to PC.

Note : The Temperature will control by two types

1. Close Loop: In Close loop the system will Run

in through PID.

2. Open Loop: In Open loop the system will have

the pre-defined ON-OFF settings done by the

system manufacture having 5 Stages:

ON Time OFF Time

Stage 1:0-100 0-9 sec 0-9 sec

Stage 2:100-150

Stage 3:150-250

Stage 4:250-300

Stage 5:>300

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Menu Screen Start

Welcome Screen

Main Menu

Menu_Key

Pressed

Start_key

Pressed

Reset_Key

Pressed

Melt1_Key

Pressed

Melt2_Key

Pressed

Melt3_Key

Pressed

Menu_Screen() Process_Start() Reset

Process

Sample1-

Hold

Sample2-

Hold

Sample3-

Hold

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Date Time Screen

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Know_Unknow Sample

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Note: On Selecting the Know Sample the user will then enter the Temperature of

the know sample.