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PROJECT DESCRIPTION

The main scope of project is to sense the presence of any activated mobile phone from a distance of about one-and-a-half feet to prevent the use of un-authorized cell phone in defense security and probated areas.

This device can detect any active cell phone i.e. while some is trying to make a call or receive a call, sending a message or receiving a message. In the above mentioned conditions a buzzer will sound, in the presence of an active cell phone in the near vicinity.

The main units of project is an RF detector, tuned LC-circuits approach, steady state values of voltage, charge and current. LC circuits is also called as resonant circuit, tank circuit, or tuned circuit, consists of two electronic components connected together; an inductor, represented by the letter L, and a capacitor, represented by the letter C. The circuit can act as an electrical resonator, an electrical analogue of a tuning fork, storing energy oscillating at the circuit's resonant frequency. As charge and voltage is formed for detecting signals in the GHz frequency band used in mobile phones as transmission frequency ranges is from 0.9 to 3 GHz.

A capacitor is used to form a part of the LC circuit as C while the lead of the same forms the L to receive RF signals from the mobile phone. When the mobile phone is activated the intermittent ring of RF transmission signal is detected by the detector that starts sounding a beeping alarm through a 555 timer in mono-stable mode and also causing a  LED to blink.

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The main scope of project is to sense the presence of any activated mobile phone from a distance of about one-and-a-half feet to prevent the use of un-authorized cell phone in defense security and probated areas.

This device can detect any active cell phone i.e. while some is trying to make a call or receive a call, sending a message or receiving a message. In the above mentioned conditions a buzzer will sound, in the presence of an active cell phone in the near vicinity.

The main units of project is an RF detector, tuned LC-circuits approach, steady state values of voltage, charge and current. LC circuits is also called as resonant circuit, tank circuit, or tuned circuit, consists of two electronic components connected together; an inductor, represented by the letter L, and a capacitor, represented by the letter C. The circuit can act as an electrical resonator, an electrical analogue of a tuning fork, storing energy oscillating at the circuit's resonant frequency. As charge and voltage is formed for detecting signals in the GHz frequency band used in mobile phones as transmission frequency ranges is from 0.9 to 3 GHz.

A capacitor is used to form a part of the LC circuit as C while the lead of the same forms the L to receive RF signals from the mobile phone. When the mobile phone is activated the intermittent ring of RF transmission signal is detected by the detector that starts sounding a beeping alarm through a 555 timer in mono-stable mode and also causing a  LED to blink.

PROJECT HIGHLIGHTS
Non-Microcontroller Project.
Call/mail for Tech Support from 10 am - 7 pm IST.
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
×
Non-Microcontroller Project.
Call/mail for Tech Support from 10 am - 7 pm IST.
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
BLOCK DIAGRAM
Hardware Requirements
  • OP amp
  • 555 Timer
  • Transistor
  • LED
  • Resistors
  • Capacitors
  • Piezo buzzer
  • Switch
  • Battery
  • Antenna
×
  • OP amp
  • 555 Timer
  • Transistor
  • LED
  • Resistors
  • Capacitors
  • Piezo buzzer
  • Switch
  • Battery
  • Antenna
Q & A
Q:  How are the numerical calculations done for the output voltage and gain of the OPAMP and 555 timer assuming the values of the different components in the circuit.
A:  Basic 555 timer in monostable mode (standard calculations) is triggered through pin2 from output of a comparator. Full explanation is available in the documents supplied in the CD.
Q:  How to write the code on to a microcontroller?
A:  Code onto a microcontroller is dumped in the HEX format using A program burner specific to the microcontroller to be used.
Q:  How can I increase the range of sensing the mobile phone?
A:  One cannot increase the sensing range with this project, but using expensive technology it is possible.
Q:  Can this project sense any mobile within the area of a room?
A:  No, the sensing distance is limited to a range of 2 feet only.
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