King Abdul aziz university Faculty of engineering Electrical and computer Department Zero lock Mohammad M. AL-Saadi Jamal R. AL-Rehily Kamal Osman Graduation project improve version of telephone lock prof. adnan afandi fall 2007

Communication is considered as pulsating heart in the world Because no doubt it is the coming future with it's different arts and shapes. INTRODUCTION Communication is the hasten way for making the distances between the people near, either by telephone nor by post office, or by the internet, So let us to stop at that small equipment which holds more and more it's the telephone Graduation project improve version of telephone lock prof. adnan afandi fall 2007

It is the sending equipment which contains a number which communication completes By it, So Zero between these numbers. Zero is the clear expression for connecting to other country or other city. As many people not use these number as well us ideal using, thinking for trying to abolish this Number from the telephone except where necessary Graduation project improve version of telephone lock prof. adnan afandi fall 2007

This idea isn't new, but the new that we use a computer by using completing circle which programming through computer, and do all requisite (PIC. Micro Control). For that this project forming three two parts. Graduation project improve version of telephone lock prof. adnan afandi fall 2007

How to use the project: Our project is working automatically if your connect it to the power and telephone Line, but the user is needed at the case of errors removing password changing, other wise the project working properly. 1.at the case of the line bad the project gives the message (Line bad ) on the LCD and the PC also gives alarm 2.at the same time of incoming call it gives the message (Ringing ) the ID of the caller 3.at tha same time if out calling if gives a message of (dialing ) and gives called ID Not allow of national or international calls for the persons that has not password and off the line if three successive wrong password 4. By entering the key the project gives a chance to cancel the errors and changing the password 5.Any call external of the home not allowable even local call. Graduation project improve version of telephone lock prof. adnan afandi fall 2007

Benefits of the project This is better than last one that this project has LCD that gives messages of warning And guiding. Also this project gives the same massages to the PC (Personal computer ) that can print the result and the complete report including the data And time. Graduation project improve version of telephone lock prof. adnan afandi fall 2007

Our project consist of (Manly) : 1.MCU (Micro controller ) 2.DTMF receiver 3.LCD ( Liquid crystal display ) 4.Line hand set Ringing sensors 5.Relays to one of the line 6.Power supply The content of the project

Block Diagram Graduation project improve version of telephone lock prof. adnan afandi fall 2007

Flowchart and description of the project: Graduation project improve version of telephone lock prof. adnan afandi fall 2007

M-8870 DTMF RECIVER Features: 1.Low power consumption 2.Adjustable acquisition and release times 3.Central office quality and performance 4.Signal 5 volt power supply. 5.Dial the suppression. Graduation project improve version of telephone lock prof. adnan afandi fall 2007

Applications: 1.Telephone switch equipment 2.Mobile radio 3.Remote control 4.Remote data entry Functional Description : M-8870 operating functions (see fig. 16 ) include a band split filter that separates high and low tones of the received pair, and a digital decoder that verifies both of frequency and duration of the received tones before passing the resulting 4-bit code to the output bus. See Table2. Graduation project improve version of telephone lock prof. adnan afandi fall 2007

general Description of PIC16f871 The pic16f871 is a low-cost performance CMOS, fully static, 13bit microcontroller. The Data EEPROM and FLASH Program Memory are readable and writable during normal operation over the entire VDD range. A bulk erase operation may not be issued from user code (which includes removing code protection). The data memory is not directly mapped in the register file space. Instead, it is indirectly addressed through the Special Function Registers (SFR). Graduation project improve version of telephone lock prof. adnan afandi fall 2007

LCD: liquid crystal display Software: using acacia code we came write the characters and numbers and symbols also we have some. Instruction to write, clearing addressing shifting all these instructions Graduation project improve version of telephone lock prof. adnan afandi fall 2007

Cost of project : prise (SR)number of chippart 52Relay 201case 0.220resistance 51transformer 22bridge rectifier 21capacitor 100µf 21on/off switch 51pic 16f capacitor 22 pf 11MT buzzer 51power call 31telephone call 22strip board 101LCD 1201variable Resistance 10k 24Connectors 25 way 101computer call 25 way 268 SRTotal Cost