This document outlines a project to create an alcohol breath analyzer using a PIC16F877A microcontroller with a display. The goal is to alert others when intoxicated individuals are near restricted areas like the kitchen or library. The breath analyzer will sound an alarm when alcohol levels reach a certain threshold. It will interface sensors to the microcontroller which will run software to control the system. The microcontroller will be programmed in C language and interface with an LCD display, relay, and sensor.

1. Project Definition / Specification
Alcohol breath analyzer with display using microcontroller
Confidential
ABSTRACT
For
Alcohol breath Analyzer using PIC microcontroller with display
Project Definition / Specification
Alcohol breath analyzer with display using microcontroller
Confidential
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2. Project Definition / Specification
Alcohol breath analyzer with display using microcontroller
Confidential
PROJECT DEFINITION / SPECIFICATION
PROJECT TYPE
Microcontroller(PIC16F877A) hardware design with software
development (Device Driver) . PIC micro controller (PIC16F877A)
based.
PROJECT DESCRIPTION
Our main motivation for creating the alcohol breath analyzer
is to get alert from drunken people. In general, in intoxicated people are usually
more care less and destructive than those not under the influence in our
particular house, kitchen and library are 2 rooms that are vocationally left by an
intoxicated. We decided to fabricate device that would allow sober housemates
to use the facility while keeping the drunken ones out. Our breath analyzer
initiates an alarm when a threshold concentration of alcohol is reached. The
microcontroller does the above job it receives the signals from the sensors, and
this signals operated under the control of software which is stored in ROM.
Project Definition / Specification
Alcohol breath analyzer with display using microcontroller
Confidential
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3. Project Definition / Specification
Alcohol breath analyzer with display using microcontroller
Confidential
BLOCK DIAGRAM
SENSOR
Reset circuit
16x2
LCD
PIC
16F877A
Controller
Oscillatory circuit
Alarm Unit
Relay Unit
PROJECT OUTLINE
 A brief introduction to internal architecture of microcontroller.
 An over view of programming of microcontroller.
 An overview on C language.
 An overview on mechanical arrangement.
 Alcohol sensor interfacing with microcontroller.
Project Definition / Specification
Alcohol breath analyzer with display using microcontroller
Confidential
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4. Project Definition / Specification
Alcohol breath analyzer with display using microcontroller
Confidential
INTERFACES USED
 Serial communication used for downloading the hex code.
 Sensor circuit interface.
 LCD interfacing
 Relay interfacing.
SOFTWARES USED
 A Cross compiler for compiling and linking the code written for
PIC16F877A.
 Serial communication software for downloading code to PIC16F877A.
 Operating system: Windows XP.
Project Definition / Specification
Alcohol breath analyzer with display using microcontroller
Confidential
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