INSPIRATIONWE FOCUS NOT TO PREVENT PEOPLE FROM USING ALCOHOLBUT PREVENT THEM FROM DRUNKEN DRIVING
BREATHALYZER DOOR LOCK PROVIDES IT CHECKS THE BAC LEVEL OF THE BLOWER IT PREVENTS THE DOOR OPENING WHENEVER THE PERSON IS TOXICATED IT ALSO PROVIDES ADMISTRATIVE ACCESS WITH A KEYPAD IT ALSO DISPLAYS THE BAC VALUE
BLOCK DIAGRAM DESCRIPTION1.PIC MC-16F877A• MASTER BRAIN OF THE DEVICE2.GAS SENSOR• DETECTS THE BAC LEVEL OF THE BLOWER3.KEYPAD• FOR SELECTING MODE AND ENTERING ACCESS CODE4.LCD DISPLAY• DISPLAYS THE BAC VALUE AND INSTRUCTIONS5.DC MOTOR• CONTROLS THE OPENING OF THE DOOR
FEATURES OF PIC-16F877A High performance RISC CPU Only 35 single word instructions to learn Interrupt capability (up to 14 sources) Eight level deep hardware stack Direct, indirect and relative addressing modes Timer0: 8-bit timer/counter Timer1: 16-bit timer/counter Timer2: 8-bit timer/counter Two Capture, Compare, PWM modules 10-bit multi-channel Analog-to-Digital converter Synchronous Serial Port (SSP) Universal Synchronous Asynchronous Receiver Transmitter (USART/SCI) Parallel Slave Port (PSP)
LCD DISPLAY UNIT•IT DISPAYS THE BAC VALUE DETECTED BY GAS SENSOR ANDADC•IT ALSO DISPLAYS BASIC INSTRUCTIONS
KEYPAD• IT IS A PUSH TYPE 12 BUTTON KEYPAD• USED FOR SELECTING MODE AND ENTESINGACCESS CODE DC MOTOR• DC MOTOR IS USED FOR CONTROLINGOPENING OF DOOR BUZZER• PRODUCING CAUTION TONE WHEN TESTFAILS AND INCORRECT PASSWORD ISENTERED
INTERNAL DIAGRAM OF GAS SENSOR MQ-303A STANDARD CIRCUITCONFIGURATION
FEATURES OF GAS SENSOR• High sensitivity•Low power consumption•Miniature-size• The change of the sensor resistance (RS) is obtained as the change of the output voltage•Generally, the sensor enters into normal working conditionsafter several minutes’ preheating• TheMQ-303A is a tin dioxidesemiconductor alcohol sensor WITHQUICK RESPONSE SPEED .
APPLICATION1.PREVENTING DRUNKEN DRIVING AND THERE BYREDUCING ROAD ACCIDENTS UP TO AN EXTENT2.IN CASE OF FAILURE OF SENSOR,WE CANDEPEND ANOTHER ACCESSING MODE3.CAN BE SIMPLY IMPLEMENTED ON ANY KIND OFDOOR SYSTEM
THANKSWe are thankful for the Co-operation and Kindness Of theStaff Of Electronics & Communication Dept. forboosting our Spirit by Giving Us Innovative Suggestionsfor the Successful Completion Of our Project Entitled“BREATHALYZER DOOR lOCK” on time.