The Team,

S V Ravi Tej,

06881A0438

C Sri Harsha,

06881A0449

P Sai Raghav,

06881A0441

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

The main objective which led to the motivation of the project isthe ‘POLLUTION’.

( Abstract )

The pollution level in an area should be indicated which

became the primary goal of the project.

Pollution Sensor :

* A smoke sensor is used to detect the level of the smoke out

of carbon dioxide which is then indicated using bar level

displays.

Conversion mechanism :

* Comparator IC’s

Pollution Level Indicator.

This would finally indicate the level of pollutants (CO/CO2) in

a chosen area.

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

Dc power supply

Components In block I

INTERRUPTER SWITCH(MOC70P3)

Components In Block II

•LM3914•LED Bar Display

MOC70P3

The MOC70P3 consists of an infrared light emitting diode coupled

to an NPN silicon phototransistor.

MOC70P3

FEATURES

No contact sensing

5 mm gap

.040” aperture

Low profile

PCB mount

Transistor output

LM3914

Drives LEDs, LCDs or vacuum fluorescents

Bar or dot display mode externally selectable by user

Expandable to displays of 100 steps

Internal voltage reference from 1.2V to 12V

Operates with single supply of less than 3V

Output current programmable from 2 mA to 30 mA

No multiplex switching or interaction between outputs

Input withstands ±35V without damage or false outputs

Outputs can interface with TTL or CMOS logic

LED BAR Display

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

Start

Co/ co2 gas when passed through sensor it generates a

voltage

The generated voltage is power amplified using a Darlington

Pair

The amplified signal from the Darlington is given to the

LM3914 in the block II

Then the LM3914 outputs a compared voltage which is used to glow the LED bar Displays.

Stop

Block I

Block II

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

Operation of BLOCK I :

The H21A1 detects the pollutant level.

The signal is amplified using the power amplifier (Darlington

Pair)

The signal is transmitted to the block 2

Operation of BLOCK II :

The signal from the block is compared using the comparator

IC`s.

The compared output is displayed on the LED bar displays.

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

Carbon Dioxide CO2 Sensor

Excellent performance CO2 Sensor, for use in a wide range of

applications, including air quality monitoring, smoke

alarms, mine and tunnel warning systems, greenhouses, etc.

The sensor is easy to use and can be easily incorporated in a

small portable unit.

Features

• High Sensitivity

• Detection Range: 0 - 10,000 ppm CO2

• Response Time: <60s

• Heater Voltage: 6.0V

• Dimensions: 16mm Diameter, 15mm High excluding

pins, Pins - 6mm High

Alcohol Sensor

Alcohol Sensor for use in Breathalyser's or in an alarm unit, to

detect the presence of alcohol vapours. This sensor unit offers

very high sensitivity, combined with a fast response time. The

unit will work with a simple drive circuit and offers excellent

stability with long life.

Features

• High Sensitivity

• Detection Range: 10 - 1,000 ppm Alcohol

• Fast Response Time: <10s

• Heater Voltage: 5.0V

• Dimensions: 16mm Diameter, 10mm High excluding

pins, Pins - 6mm High

High-Accuracy Alcohol Sensor

Hot-wire High Accuracy Alcohol Sensor, for use with

breathalyser units. Low power consumption, makes this

sensor ideal for battery powered units. Wide operating

temperature range with little or no adjustment required for

temperature and humidity

Features

• High Sensitivity

• Detection Range: 0 - 1,000 ppm Alcohol

• Fast Response Time: <20s

• Working Voltage: 3.0V

• Working Current: ~120mA

• Dimensions: 16mm Diameter, 10mm High excluding

pins, Pins - 6mm High

LPG Sensor

Ideal sensor for use to detect the presence of a dangerous

LPG leak in your car or in a service station, storage tank

environment. This unit can be easily incorporated into an

alarm unit, to sound an alarm or give a visual indication of the

LPG concentration. The sensor has excellent sensitivity

combined with a quick repsonse time. The sensor can also

sense iso-butane, propane, LNG and cigarette smoke.

Features

• High Sensitivity

• Detection Range: 100 - 10,000 ppm iso-butane propane

• Fast Response Time: <10s

• Heater Voltage: 5.0V

• Dimensions: 18mm Diameter, 17mm High excluding pins,

Pins - 6mm High

Carbon Monoxide (CO) Sensor

Carbon Monoxide sensor for use in industrial or mining

applications. This unit offers excellent long life performance

with stable sensing characteristics.

Features

• High Sensitivity

• Detection Range: 10 - 1,000 ppm CO

• Response Time: <150s

• Heater Voltage: 5.0V

• Dimensions: 16mm Diameter, 10mm High excluding pins,

Pins - 6mm High

Natural Gas Sensor

Detect dangerous gas leaks in the kitchen or near the gas

heater. This unit detects 300 to 5000ppm of Natural Gas. Ideal

to detect dangerous gas leaks in the kitchen. Sensor can be

easily configured as an alarm unit. The sensor can also sense

LPG and Coal Gas.

Features

• High Sensitivity

• Detection Range: 300 - 50,000 ppm Natural Gas

• Fast Response Time: <10s

• Heater Voltage: 5.0V

• Dimensions: 18mm Diameter, 17mm High excluding pins,

Pins - 6mm High

Inde

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Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages and

Disadvantages

Conclusion

References

Advantages

Circuit is Simpler

Circuit is Flexible

Surrounding effects are less

disadvantages

For Real time application the cost may be a bit more.

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

1.Comlete circuit consists of 2 Mechanisms

Pollution Sensing Mechanism.

Pollution Indicating Mechanism.

2.Pollution Sensor – Senses Pollutants.

Pollution Indicator - Indicates Pollutant Level.

3.Just by replacing the sensor a new pollutant indicator

is created.

Inde

x:

Introduction

Abstract

Block diagram

Components

Flow Chart

Operation

Applications

Advantages

Disadvantages

Conclusion

References

www.google.com

www.circuits-projects.com

www.crazyengineers.com

www.toprojects.blogpsot.com