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PROJECT DESCRIPTION

The main objective of this project is to display dialed telephone numbers on a set of seven-segment- LED-based display system for better visibility by using the concept of DTMF (dual tone multi frequency) sensing.

Every button on the keypad of the telephone generates a unique frequency when pressed. These frequencies are decoded by a DTMF decoder and digital signals from its output are fed to a microcontroller through buffer circuits. While the program is executed, the output of the microcontroller delivers same data to parallel connected seven-segment displays.

The parallel connected seven-segment display operates in multiplexing mode fed from the microcontroller through driving transistor switches to generate exact display of the dialed numbers. In a parallel connected several 7 segment units, one seven-segment display 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 / or land line duly connected from its ear phone socket to the DTMF decoder for receiving data. This data is transmitted to the microcontroller for processing. This processed data is then given to the parallel connected seven-segment displays.

Furthermore, this project can be enhanced for displaying time, cost, and date parameters on a 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:  The microcontroller used in this project is a 40 pin IC from 8051 family.
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.
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