Calling Card Dialer

Automatic dialer for calling card.

As part of one of our projects, we are looking for an experienced telecommunications electronics.

Our project involves the construction of an automatic dialer for calling card meets all safety standards in force in this sector.

The first part of this project is the realization of the electronic diagram of the product.

So that you understand correctly what we want to achieve, we will briefly explain how the product works.

The product is physically placed between the user's phone and the wall outlet telecommunications provider.

If a call is incoming, our product will do nothing and be completely transparent to the user.

In the case of an outgoing call, when picking up the telephone, our product will give the dial tone dial the phone number.

This operation must be performed without physically connecting the user to the telephone line.

When the user has finished dialing his phone number, our product physically connect the phone line and dial sequences calling card to route the call to.

In summary, the user dials the desired number and then our product communicates with the core of calling card to save the cost of communications.

We have selected some components that must be in the diagram.

These components are:

IXYS Litelink III CPC5622 - Insulation barrier according to the protocols in force internationally .

$ [url removed, login to view] file/[url removed, login to view]

IXYS CPC5602 - Mandatory with the CPC5622 .

$ [url removed, login to view] file/[url removed, login to view]

HOLTEK HT9170B - DTMF Receiver

[url removed, login to view]

HOLTEK HT9200B - DTMF Generators

[url removed, login to view]

FTDI FT232R - USB UART - Allows to connect our computer-generated.

[url removed, login to view]

MICROCHIP PIC18F46K20 - Microcontroller performing product management.

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The following pins of the microcontroller are already operated :

RE0 - RE1 - RE2 (For LEDs )

The PORTC ( RC0 - RC1 - RC2 - RC3 - RC4 - RC5 - RC6 - RC7 ) are used for USB ( RC6 - RC7 ) RS232 communication

For the rest of the schematic , everything is possible.

The PORTA - PORTB - PORTD are currently free so you can connect other components.

I stay at your disposal for any additional information and suggestions.

Skills: AutoCAD, CAD/CAM, Electronics, Engineering, Product Design

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About the Employer:
( 0 reviews ) Dominican Republic

Project ID: #4883207

6 freelancers are bidding on average $1344 for this job


Hello, I can do this project. Please see my project experience and reviews. PM me for more details Joby

$3157 USD in 45 days
(28 Reviews)

Hello, electronic engineer available. you can check my work on my pro web site. I can design and provide you a full assembly RoHS prototype. compliant to all requirements and certification. I'm expert with Mico More

$2222 USD in 35 days
(3 Reviews)

please check private message

$684 USD in 3 days
(18 Reviews)

I have experience with the PIC 18F, designing devices and programming in both assembly and C. I have read over the data sheets of the chips that you've mentioned and I can deliver what your looking for. I can deliver More

$555 USD in 30 days
(0 Reviews)

hi i have 10 year plus experience in projects design and development. contact me

$722 USD in 30 days
(0 Reviews)

HI, I already used the components you suggested to realize a naval telephone used inside the navy. no problem at all to do this. some few details will be clarified in the following (like size, power...) I wou More

$722 USD in 5 days
(0 Reviews)

Dear Customer, first of all please allow me to introduce myself: I'm an automation and information technology engineer with over 25 years experience in electronics and computers. I'm assistant professor, working for ov More

$555 USD in 3 days
(0 Reviews)