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PROJECT DESCRIPTION

The main objective of this project is to display the dialed telephone number on seven segment display for better visibility. This project is based on the concept of DTMF (dual tone multi frequency). Every button on the key pad of a telephone generates a unique frequency when pressed.

These frequencies are decoded by a DTMF decoder and the digital signals are fed to the microcontroller through buffer circuits. While the program is executed, the output of the microcontroller delivers the same data to parallel connected seven segment displays.

The parallel connected seven segment displays operate in the multiplexing mode fed from the microcontroller through driving switches to generate exact display of the numbers dialed. In actual operation only one seven segment display interfaced shows the number at any given time out of the ten used.

Owing to persistence of vision, all the numbers appear glowing at the same time as they are in high speed multiplexing mode. The project uses an 8051 family microcontroller, and a cell phone duly connected from its ear phone socket to the DTMF decoder for receiving the data. This data is transmitted to the microcontroller for processing. The processed data is then given to the parallel connected seven segment displays.

Further the project can be enhanced to displaying the time, cost, day and date parameters on the digital display.

PROJECT HIGHLIGHTS
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
Call/mail for Tech Support from 10 am - 7 pm.
Can be Customized for Arduino, Raspberry Pi, PIC
BLOCK DIAGRAM
Display of Dialed Telephone Numbers on Seven Segment Display
Hardware Requirements
  • 8051 series Microcontroller
  • DTMF decoder
  • Resistors
  • Capacitors
  • Diodes
  • Voltage Regulator
  • Transformer
  • 7-Segment display
Software Requirements
  • Keil compiler
  • Language: Embedded C or Assembly.
Q & A
Q:  Which microcontroller is used in this project?
A:  An 8051 family 40 pin microcontroller is used in this project.
Q:  Can one use it with landline?
A:  Yes, it can be used with landline phone to display the dialed numbers
Q:  Can it be used with mobile phones?
A:  Yes it can be used with mobile phones
Q:  What is DTMF?
A:  DTMF or Dual tone multi frequency is a signaling system which uses a combination of two frequency tones to represent a key pressed on the keyboard of any cell phone.
READ WHAT OTHERS HAVE SAID
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Showing 1 of 1 reviews
rahulbattu, Mumbai on 14th May, 2014, 10:03 AM

As Edgefx has home delivery system, we can know about kit delivery status in online itself. We found it is user friendly & simple in implementation & complex in demonstration. Can improve in future by clearing minor mistakes through a call or online only.

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