Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Phone call limiter - 16F84 and source code needed

Status
Not open for further replies.

Ivanko

Newbie level 3
Joined
Sep 4, 2003
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
38
Phone call limiter

Anyone help ?
I need project with 16F84 for telephone call limiter and source code if is possible.
 

glenjoy

Banned
Joined
Jan 1, 2004
Messages
963
Helped
72
Reputation
146
Reaction score
20
Trophy points
1,298
Location
Philippines
Activity points
0
Re: Phone call limiter

The phone call will be limited in what way? How many minutes, how to be restarted.
 

Ivanko

Newbie level 3
Joined
Sep 4, 2003
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
38
Re: Phone call limiter

Limit outgoing calls, all calls start with 0,9,or some other number : next, limit some call area 063,064 or some other : next, limit all calls except one
and some other functions and limiter is with PIC16F84 and MT8870.
 

semiconductor

Full Member level 4
Joined
Apr 4, 2003
Messages
236
Helped
4
Reputation
8
Reaction score
0
Trophy points
1,296
Activity points
2,737
Excuse me, I do not fully understand your question. limit here means phone-number limit?? That, you can only dial some of allowed phone number?
 

glenjoy

Banned
Joined
Jan 1, 2004
Messages
963
Helped
72
Reputation
146
Reaction score
20
Trophy points
1,298
Location
Philippines
Activity points
0
Re: Phone call limiter

Ivanko said:
Limit outgoing calls, all calls start with 0,9,or some other number : next, limit some call area 063,064 or some other : next, limit all calls except one
and some other functions and limiter is with PIC16F84 and MT8870.
When you are dialing a number, you are already making an outgoing call, now maybe you are telling me is limit, international call, domestic long distances?
 

Ivanko

Newbie level 3
Joined
Sep 4, 2003
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
38
Re: Phone call limiter

Yes the blocker must have next function:
-Block all calls starts with nr.0, or nr.1, or.........nr.9
-Block all calls starts with call area ( 0 X X ) ( X are numbers from 0-9)
-Block all calls except one
-Block all calls
-Must use power from tel. line

Maybe now is beter.
 

glenjoy

Banned
Joined
Jan 1, 2004
Messages
963
Helped
72
Reputation
146
Reaction score
20
Trophy points
1,298
Location
Philippines
Activity points
0
Re: Phone call limiter

All you need is the IC that I am looking for my friend. MT8888 or MT8870, but I think it can't be powered by the phone line alone, just like your caller ID phone, you need batteries for it. Just interface it to a microcontroller then have it recognize the first number you dialed.
 

wisely77

Member level 4
Joined
Jun 18, 2002
Messages
75
Helped
4
Reputation
8
Reaction score
3
Trophy points
1,288
Activity points
677
Re: Phone call limiter

hi,

you need to study about DTMF and you need to isolate the phone from the phone line. taking over the phone function, monitor the phone keypress by decoding the DTMF. if the key is correct, release the phone line and pass it to the phone.
 

aron

Newbie level 4
Joined
Jan 5, 2004
Messages
7
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,283
Activity points
86
Re: Phone call limiter

some time ago it was published by elektor a circuit that do that, but i use a atmel ic (i think)
 

glenjoy

Banned
Joined
Jan 1, 2004
Messages
963
Helped
72
Reputation
146
Reaction score
20
Trophy points
1,298
Location
Philippines
Activity points
0
Re: Phone call limiter

wisely77 said:
hi,

you need to study about DTMF and you need to isolate the phone from the phone line. taking over the phone function, monitor the phone keypress by decoding the DTMF. if the key is correct, release the phone line and pass it to the phone.

That will be the function of the MT8880 or MT8870, to decode the keypress then let the microcontroller recognize it.
 

conkhicon

Advanced Member level 4
Joined
Aug 31, 2004
Messages
107
Helped
3
Reputation
6
Reaction score
0
Trophy points
1,296
Activity points
1,015
Re: Phone call limiter

You should buy a small PABX. It's very cheap., About 100$ no shipping
I think that it's very cheaper your project
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top