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بسم الله الرحمن الرحيم. An-Najah National University Faculty of Engineering Computer Engineering Department. Graduation Project. Computerized Gas station. Prepared By Muhammad Addas & Ramez Dmaidi Supervised By Dr- Loai Malhes. Introduction. - PowerPoint PPT Presentation
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An-Najah National UniversityAn-Najah National UniversityFaculty of EngineeringFaculty of Engineering
Computer Engineering DepartmentComputer Engineering Department
الرحيمالرحمناللهبسم
Computerized Gas stationComputerized Gas station
Prepared ByPrepared By
Muhammad AddasMuhammad Addas
&&
Ramez DmaidiRamez Dmaidi
Supervised BySupervised By
Dr- Loai MalhesDr- Loai Malhes
Graduation Project
Introduction
In this project we tried to design full computerized Gas station without employees in station, this station is one of multiple networked units.
Each unit is connected serially with PC In which enough information about customers available including account number and balance.
The customers enter account number, the computer in that station checks for valid account and sends back the result to PIC.
If the account valid the user enter the number of liters wanted.
Objectives
1) No need for the worker in each station.
2) The system will work until the amount that entered finished.
3) Security, each user has account number.
4) The price updated by the centralized server daily.
Hardware Diagram
Microcontroller PIC 16F877
Keypad
LCD
Relay
PumpSerial
PC
SimulationSimulation
Hardware Components
1) PIC16F877 : we choose it because we are familiar and available in the market with suitable price.
2) LCD : 16 char one line LCD.
3) pump : 12V.
4) Relay: 12 v.
5) Buffer to drive Relay 7407.
The buttons are debounced by hardware.
Then the buttons are interfaced to 8-3 active low
encoder we need two encoders for 12 buttons.
Then the output of them is fed to PIC.
6) Keypad: to interface card reader we need to save the pins of the pic so we choose the following design
of keypad:
Encoder Connection
1 2
1KΏ
Vcc = 12
From PIC c3
Relay
To Pump
7407
Pump Circuit
We use 7407 to drive the pump as it requires high current and the relay to isolate the pump from the PIC
The Serial Diagram
+ 1u
U1
ICL232
12
14710
11
138 9
13
45
26
R1OUT
T1OUTT2OUTT2IN
T1IN
R1INR2IN R2OUT
C1+C1-
C2+C2-
V+V-
C7
C6
+ 1u
594837261
+ 1u
+ 1u
Serial And PIC Interconnection The project based on using a Card Reader to handle he money
payment ,but cause of the lack of these resources we replace the Card Reader with the a PC control using the serial port.
The PIC controller gets the account number from an external keypad and send it thought the serial port to be handled by a Visual C+
+ program.
The program checks the account number and send the balance for this customer to the PIC, then gets the number of litters to be pumped.
The program performs the calculations related to the balance and returns the new value to be displayed on the LCD.
A daily update is done for the price value .
Software Flow Chart
Serial
Test Account
Start
Initialization
Read Account Get Balance
Price
#Of liters
Pump 0 1
Problems
Card Reader: not available specially programmer.
Encoder: takes alot of time to find it.
Pump needs a lot of current.
FINALLYFINALLY
Thanks to all…Thanks to all…