1. DEPARTMENT OF ELECTRONIC AND
ELECTRICAL ENGINEERING
OBAFEMI AWOLOWO UNIVERSITY
ILE-IFE, OSUN STATE.
DECEMBER, 2014
2.
THE PROJECT IS BUILT TO BEHAVE IN THE SAME WAY
AS A CLOSED LOOP SYSTEM.
THE INPUT IS THE CODE ENTERED
THE MICROPROCESSOR, IC AND DC MOTOR
CONSTITUTE THE INTERMEDIATE STAGE.
THE ACTUAL MOVEMENT OF THE GATE IS THE
OUTPUT.
THE LIMIT SWITCH SERVE AS THE FEEDBACK.
INTRODUCTION
3.
THE ARDUINO MACHINE LANGUAGE IS
USED AS THE COMPILER LANGUAGE FOR
THE MICROPROCESSOR.
THE ATMega324P MICROCONTROLLER CAN
SOURCE OR SINK CURRENT UPTO 40mA,
HENCE THE NEED FOR A MOTOR DRIVER.
OPERATING VOLTAGE OF THE DC MOTOR
MAY BE MUCH HIGHER THAN OPERATING
VOLTAGE OF THE MICROCONTROLLER.
FEATURES OF THE
AUTOMATIC GATE OPENER
4. THE 4*3 NUMERICAL KEYPAD INPUT.
THE ATMega324P MICROCONTROLLER
THE H-BRIDGE L293D IC MOTOR DRIVER
THE RELAY TIMER
THE LIMIT SWITCH
THE DC MOTOR
POWER SUPPLY UNIT
THE 16*2 LCD DISPLAY
ARDUINO MACHINE LANGUAGE
LIST OF COMPONENTS
8.
THE STEPS BELOW OUTLINE THE MAJOR
PROCESSES FROM THE POINT OF CODE ENTRY TO
THE OPENING OF THE GATE :
THE FIRST MAIN PART OF CIRCUIT IS THE
INPUT CODE LOCK INTERFACE WHICH ENABLES
THE CODE INPUT TO BE ENTERED FOR
AUTHORISATION AND ACCESS TO BE GRANTED
TO THE OPERATOR. IT IS INTERCONNECTED TO A
MICROCONTROLLER.
WORKING PRINCIPLE
9.
THE ATMEGA328P MICROCONTROLLER HELPS TO
INTERPRET THE INPUT DATA BEFORE GIVING
AUTHORISATION TO THE USER .
SENDS A BINARY SIGNAL IN THE FORM OF HIGH’S
AND LOW’S TO THE INPUT OF THE IC L293 WHICH
DRIVES THE DC STEPPER MOTOR IN ONE
DIRECTION OR THE OTHER EXPLAINING THE
PRINCIPLE OF OPENING AND CLOSING OF THE
GATE.
WORKING PRINCIPLE
10.
THE LIMIT SWITCH POSITIONED AT TWO
EXTREME POINT ENABLES A FEEDBACK
TO BE SENT THROUGH THE
MICROCONTROLLER TO THE IC L293D
WHICH INTURNS REVERSE THE POLARITY
OF THE DC MOTOR AND THE GATE
RESPOND AFTER A PRESET TIME(IN
SECONDS) BY CLOSING AUTOMATICALLY.
.
WORKING PRINCIPLE
11.
THE PROJECT IS OF GOOD VALUE TO
RESIDENTIAL HOUSES AND SMALL OFFICES
MAINLY.
THE COMPONENT USED IN THE PROJECT MAKES
THE PROJECT TO BE COST-EFFECTIVE AND
EFFICIENT.
TO COUNTER THE EFFECT OF BACK E.M.F
OUTPUT DIODES ARE INCLUDED WITHIN THE IC.
CONCLUSIONS
