Monday, 16 November 2015

Week 6


  • Project overview: 
This project is mainly about the designation of a RF detector sensor that will sense the presence of mobiles phones in the particular area. The illustration of the system can be represented as follow:

  • Research Methodology:
Based on the illustration before, to achieve the design specification, a through research must be done and in order to achieve the objective,  the following protocol had been set up.

  1. Do a literature review about the mobile phones, RF signal, wireless communication and others.
  2. List and find out the suitable component for the circuit design.
  3. Component selection.
  4. Design the RF detector circuit.
  5. Test the circuit to check whether can work properly or not.
  6. Result and analysis..

Sunday, 15 November 2015

Week 5


Block Diagram

Circuit Diagram

This detector circuit detects an RF signal ranging from 860 MHz until 965 MHz which is previously had been discussed in the chapter before which is in GSM band. When a mobile phone been detected, the buzzer will sound and the LED will blinking and this will alert the other people that someone at the particular area had using their mobile phones.

Circuit Description:

An ordinary RF detector using tuned LC circuits is not suitable for detecting signals in the GHz frequency band used in mobile phones. The transmission frequency of mobile phones ranges from 0.9 to 3 GHz with a wavelength of 3.3 to 10 cm. So a circuit detecting gigahertz signals is required for a mobile bug. Here the circuit uses a 0.22μF disk capacitor (C3) to capture the RF signals from the mobile phone. The lead length of the capacitor is fixed as 18 mm with a spacing of 8 mm between the leads to get the desired frequency. The disk capacitor along with the leads acts as a small gigahertz loop antenna to collect the RF signals from the mobile phone.

Op-amp IC CA3130 (IC1) is used in the circuit as a current-to-voltage converter with capacitor C3 connected between its inverting and non-inverting inputs. It is a CMOS version using gate-protected p-channel MOSFET transistors in the input to provide very high input impedance, very low input current and very high speed of performance. The output CMOS transistor is capable of swinging the output voltage to within 10 mV of either supply voltage terminal.

IC NE555 timer is highly stable controller capable of producing accurate pulses. With a monostable operation the time delay is controlled by one external resistor and one capacitor. With an stable operation, the frequency and duty cycle is accurately controlled by two external resistor and one external capacitor.

Week 4

On this week, my partner and I search some components and buy that need to build our mobile phone detector. Both of us went to Jalan Pasar, Kuala Lumpur and bought all the components that is needed for our final year project.

Below is the list of components:

a)  Resistor:

  1. R1- 2.2MΩ
  2. R2- 100kΩ
  3. R3- 2.2MΩ
  4. R4- 1kΩ
  5. R5- 12kΩ
  6. R6- 15kΩ

b) Capacitor:

Ceramic capacitor
  1. C1- 22pF
  2. C2- 22pF
  3. C3- 0.22μF
  4. C5- 47pF
  5. C6- 47pF
  6. C7- 0.1μF
  7. C8- 0.01μF
Electrolytic capacitor

  1. C4- 100μF/ 16V
  2. C9- 4.7μF/ 16V

c) CA3130 Operational Amplifier:

d) Transistor:

T1- BC548

e) 555 Timers:

f) Antenna:

Wire type- detection area until 1.5m
Alternative- telescope antenna radio type, detection area until 20m

g) Piezo-buzzer:

h) Light Emitting Diode (LED):

i) On-off switch:

Week 3

History of the communication system

          Communication is the process where data or signal been send from one point to another point.The first information conveyed showed by the history is by direct method through people’s conversation.After realizing that distance has become the barrier, people start using smoke, letters or noise as a medium to send the signal.When the era changes and the people start to globalize, the technologies also start to grow to become more updated and make users easier to use.The new era of electronic communication also been trigged as time move on.The electronic communication system that has been created is a telegraph, telephone, fax, radio,satellite and mobile phone. The brief history of communication system can be seen as follow:

           Figure 1.2:Chronology of the electronic communication technology development

Samuel Morse invented telegraph
Alexander Graham Bell invented telephone
Radio communication system was invented
Television was invented
FM radio
Radar and microwave system was invented for World War II
Beginning of the satellite communication system
Creation of the mobile phone by Motorola
Optical communication and Internet

Week 2

Introduction: Development of Mobile Phone Detector in Hospital Environment.

Mobile phones nowadays are major technology that have been supported by many peoples.The usage of the mobile phones doesn’t only for business material but also for personal use. Because of this,we can see many people including students in high school already having mobile phone with them .With instant access from it, user can send short message and make a call to others which make a mobile phones is a must need technology nowadays.The phenomenon also supported by growth of the numerous telecommunication companies such as Maxis, Celcom, Digi, U-mobiles and others.

With the increasing user and subscribers for this Telco companies, many of this subscriber tend to forgot to silence their hand phones in the restricted areas such as mosque, meeting room , library and others.Its will become a habit and and can disturb people around us who want in silence environment.

The idea of this project is to create a system that can detect the active signal from the mobile phones and alert the users to not use their phones in those particular areas in hospital environment.

Week 1

Hi !
Welcome to our blog.
This is our first time using blog to make a report for our final year project.

Importantly, I would like to introduce myself and my partner.

My name is Muhammad Faiz and my partner name is Afiq Haszlan. Both of us study at University Kuala Lumpur British Malaysian Institute and still pursuing my diploma of engineering in electrical and electronics. This is an official blog for my final project. And you're invited to visit and do comment .

Thank you !