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By: Akanksha & Anu2109 & 2077

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WHATS IT ALL ABOUT

indicates how much of each of the red, green andblue component is included in incident light

if all the components are at zero the result is

black if all are at maximum, the result is the brightest

white

component values are stored as integer in the range0 to 255

the range may be represented as either decimalor hexadecimal numbers.

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APPARATUS REQUIRED1. Microprocessor 8085 (Dyna)

2. 26 Pin Female to Female FRC Cable3. 26 Pin FRC Male Connector

4. Power Supply ( 5V, 12V,grnd)

5. PCB (Printed Circuit Board)

6. ICs: ADC 0809, CD 4047, LM 324 (with bases)

7. Resistors (100 ohms, 10, 22 and 47 kilo ohms)

8. Capacitors (10 pico farads)

9. Pin Diodes (BPW 32)10. Light Source

11. Ribbon Cable (connecting wires)

12. Soldering Iron (with stand)

13. Soldering Wire and Flux

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8085 MICROPROCESSOR

Microprocessor is a multipurpose,programmable, clock driven, register basedelectronic device

8085 uP:8-bit uPhas 64K memory40 pins requires single +5V supply operate with 3MHz single phase clock. instructions are written in hexadecimal code

and entered in single board microcomputersusing hex keys

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8255A PROGRAMMABLE

PERIPHERAL INTERFACE 24 input/output pins 8 data lines (D0 - D7)

2 address lines A1 and A0

A1 A0 Function

0 0 Port A

0 1 Port B

1 0 Port C1 1 Control Register

6 pins are: reset, Vcc, grnd,R/W, control signal

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CD 4047

LM 324

LM 324

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FLOWCHARSP C700

RED

B A

GREEN

C A

BLUE

D A

START

STOP

A 98H

OUT CW

A 00H

OUT B

A 00H

A 40H

A 00H

OUT B

OUT B

OUT C

RED

X

X

A 01H

OUT C

A 00H

A A.80H

A 00H

OUT B

OUT C

IN C

IS

A=8

0?

A 00H

X

X

OUT B

A 80H

OUT B

IN A

RET

NO

YES

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CONCLUSION

The hardware system together with thesoftware instructions shows successful

execution of desired operation

The microprocessor successfully shows the

hexadecimal values of Red, Green and Bluecolor components present in the incident light

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APPLICATIONS

The RGB model is widely used: for display of colors on CRT, in LCD, plasma

display or LED display such as a television, acomputers monitor in video electronics industry in image scanners

in framebuffer (a digital device forcomputers which stores data in video memory)

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LIMITATIONS

encounters the problem of distance betweenthe light sources and pin diodes as when light

source is much closer to diodes, it focuseslight on any one of the three diodes

gives undesired results with high intensity

lights like the sunlight