Searching \ for 'coin recognition' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=coin+recognition
Search entire site for: 'coin recognition'.

Truncated match.
PICList Thread
'coin recognition'
1996\11\25@214850 by Gonzalo Palarea

flavicon
I need to build a controller for a coin operated machine, which has to
recognize the different coin values.  Plus, it has to be capable of being
set-up for other countries' coins.  Does anybody know if such a detector
exists, and how it can be connected to a PIC?

1996\11\25@215912 by Dave Mullenix

flavicon
face
At 08:53 PM 11/25/96 -0600, you wrote:
>I need to build a controller for a coin operated machine, which has to
>recognize the different coin values.  Plus, it has to be capable of being
>set-up for other countries' coins.  Does anybody know if such a detector
>exists, and how it can be connected to a PIC?

There are several different brands of coin mechanisms that will do what you
want.  You pop the coin in and the box checks it thoroughly to make sure
it's not a slug or counterfit, then closes an appropriate contact to tell
you what kind of coin it was.  They're not too expensive - most video games
have two of them inside.

Call any place that handles video arcade games or vending machines and they
should be able to tell you where to get what you need or maybe even sell you
a coin box from their stock.

Dave, N9LTD

1996\11\25@234641 by rry W. Ogletree

flavicon
face
Contact Coin Mechanisms, Inc.  at 400 Regency Dr., Glendale Heights, IL.
60139.  Their phone is (708) 924-7070 or(800) 323-6498.
They make a line of coin comparitors (electronic coin mechs.) that can
be calibrated for foreign coins.

               Perry
               N0NMC@N0LBA.#CEMO.MO.USA.NOAM (Packet)
               spam_OUTpogletreTakeThisOuTspammail.coin.missouri.edu (Internet)

On Mon, 25 Nov 1996, Gonzalo Palarea wrote:

> I need to build a controller for a coin operated machine, which has to
> recognize the different coin values.  Plus, it has to be capable of being
> set-up for other countries' coins.  Does anybody know if such a detector
> exists, and how it can be connected to a PIC?
>

1996\11\26@134239 by EVAN CRANNA

flavicon
face
I noticed your application. I will be needing something similar soon.
Can you let me know if you are successfull with the comparotor
recoomended
                       Thx...Evan Cranna

1996\11\26@142816 by mike

flavicon
picon face
In message  <.....199611260253.UAA08539KILLspamspam@spam@jaguar.tikal.net.gt> PICLISTspamKILLspamMITVMA.MIT.EDU
writes:
> I need to build a controller for a coin operated machine, which has to
> recognize the different coin values.  Plus, it has to be capable of being
> set-up for other countries' coins.  Does anybody know if such a detector
> exists, and how it can be connected to a PIC?
>

Mars Electronics are the market leaders in the UK, supplying (amongst
others) British Telecom.

Their offices are just down the road from me. If you want
their phone or fax number please e-mail me.



Regards,

Mike Watson

1996\11\27@015500 by Werner Terreblanche

flavicon
face
>>I need to build a controller for a coin operated machine, which has
>>to recognize the different coin values.  Plus, it has to be capable
>>of being set-up for other countries' coins.  Does anybody know if
>>such a detector exists, and how it can be connected to a PIC?

>There are several different brands of coin mechanisms that will do
>what you want.  You pop the coin in and the box checks it thoroughly
>to make sure it's not a slug or counterfit, then closes an appropriate
>contact to tell you what kind of coin it was.  They're not too
>expensive - most video games have two of them inside.

I once opened one such mechanism that come from a one arm bandit slot
machine.   It works on a metal detector principle with two separate,
but similiar search coils.  A fixed coin gets permanently installed
over one of the coils, and the deposited coin then gets compared to
this fixed coin.  But this only lets you recoginise one particular
coin.  I presume the way to recognise several different types of
coins would be to use one such coil, and store a footprint lookup
table for each different coin that needs to be recognised.  That way
you can teach the device which coins to accept.

The mechanical problems to overcome would probably the most difficult
part of your design.

--
Werner Terreblanche   Tel +27 21 7102251   Fax +27 21 721278
.....wterrebKILLspamspam.....plessey.co.za (work)  OR  EraseMEwernerspam_OUTspamTakeThisOuTaztec.co.za  (home)
Plessey SA, PO Box 30451, Tokai 7966, Cape Town, South Africa

1996\11\27@023525 by Doug Claar

flavicon
face
>>>I need to build a controller for a coin operated machine, which has
>>>to recognize the different coin values.  Plus, it has to be capable

If you are building your own coinbox, I hope you aren't liable for any
losses.  There are many different and unique ways to defraud a coin box;
ways you'd probably *never* think of (I know I wouldn't).  People have
been working on this particular fraud for a long time.  I wish I had the
reference handy, but I read an article quite some time ago about the
evolution of the public telephone's coinbox.  For every step AT&T took,
the "baddies" countered with a new technique.

Ok, so maybe it isn't *exactly* the same, but it gives you the idea.  If
you are going to do the whole thing from scratch (I might have
misunderstood you, you might just want to know where to get one), here
are two things to worry about, just off the top of my head:

-How will you handle coins on either strings or a little wire that is
just long enough to get the coin in front of your sensor, and then
yanked as soon as it registers?

-If you use a coil, how will you determine if that disk is a coin
or a slug that is similiar in electromagnetic properties?

And these aren't even very sophisticated, and don't even touch on brute
force or other techniques. And I've seen the first one done: That was
how management dealt with "It ate my coin"...

==Doug Claar

==Doug Claar


'coin recognition'
1997\03\07@232636 by Per Lindqvist
picon face
On Wed, 27 Nov 1996 09:01:50 GMT+2, Werner Terreblanche wrote:

>>>I need to build a controller for a coin operated machine, which has
>I once opened one such mechanism that come from a one arm bandit slot
>machine.   It works on a metal detector principle with two separate,
>but similiar search coils.

I also have opened several coin operated mechanisms.
The simplest ones just roll the coin down a sloping plane in such a way
that only a coin with proper weight and size will trigger a microswitch.

A more advanced mechanism I found in a coin operated telephone.
In it, the coin is rolled down a sloping plane. In the track there are
two stations. One that capacitively senses the size of the coin, by
an array of electrodes on a printed circuit board, and
another where it passes by a coil, where I guess it inductively senses
the material of the coin.

My idea for making a coin validator myself (with a PIC of course), was
to sense the size with an array of LED-Photo diodes, and the material
with some kind of inductive sensor. If the coin has to roll down a sloping
plane with a certain speed, that can be timed by the pulse length from
the photodiodes/capactivie sensors, any interference with the coin, like
attaching a string to it, or something, will give the wrong result.
You can also put a special sensor, so that if the coin is pulled
backwards, the validator will enter some kind of tilt state.

More... (looser matching)
- Last day of these posts
- In 1997 , 1998 only
- Today
- New search...