I4ll explain a bit:

I need a coin detector circuit / mechanism that should detect
two types of coins (or at least, if the circuit/mechanism gets
too much complex, detect just one).
It should reject invalid ones, so just like a Vending Machine.
Don4t want to buy one, for cost reasons, I should made it by myself.

Any clue ??

Thanks to whom answered before.


  Gabriel.-


-----Mensaje original-----
De: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]En nombre de Jinx
Enviado el: Jueves, 19 de Febrero de 2004 17:47
Para: PICLIST@MITVMA.MIT.EDU
Asunto: Re: [EE]: Coin detector circuit


Hi Gabriel, what exactly do you want the detector to do and
what sort of application is it ? For example do you need to

- detect any metal coin
- detect counterfeits
- differentiate and count coins
- have any sort of reject system
- comply with any commercial laws re performance

etc etc

I have made my own coin detectors (not strictly what's known
as a "coin mechanism"). A sloping chute with opto-interrupters
at different heights to detect and count the 6 NZ coins. Basically
it's a digital system. If you can do the engineering and wire up
diodes it's pretty easy

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