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Topic: how to detect coin mech pulses (Read 738 times) previous topic - next topic

steve_w

Hey,

I'd really appreciate some advice on a project that I'm right in the middle of. 
I hope I've posted in the right section - I've searched the rest o the forum but I still don't really understand how to tackle my problem.
 
I'm trying to get a coin-mech (the type used in arcade machines) to work with the arduino. it
is a single coin type that allows the pulse to be set manually.
 
The wiring harness for the mech is as follows:

grey line: counter (+/-)
red line: DC +12V
White line: Coin Signal
Black Line GND
grey Line: counter (+/-)
 
The spec sheet for the mech states that the timer Switch, for synchronising the system has three options:
100ms
50ms
30ms
 
-----
 
OK.. from what I understand i would need to use the White Line to ascertain when a correct coin has been inserted - counting the pulses, I believe..
 
Firstly, I haven't been able to work this out.
Secondly, I think I blew one of the pins by putting the line straight into my arduino - how do I avoid this?
 
Many thanks for any advice!

fungus

Did you connect all the ground lines together (mech+Arduino)?

What voltage do you measure on the white line with a multimeter?
No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

steve_w

Hi Fungus,

I haven't tied all the ground lines together should I do so?

The Voltage from the coin line is 6v

Thanks.

Grumpy_Mike

Yes all grounds need to be connected together.

liudr

If the coin mech gives 6V output, then you need a voltage divider to drop it to 5V. Try a white-1Kohm-5kohm-gnd circuit and use arduino to sense between the two resistors. What are grey counter +/-?

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