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Reset coin counter to Zero?

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DaOld Man:

I think this would be the way to go if you want to use diodes, but I wouldnt do it this way.

protokatie:


--- Quote ---The relay may be over kill.
--- End quote ---

I woundn't call it overkill. Separating two different voltage systems with a relay in this kind of application is what I would call insurance. Besides, a 12 volt rated relay costs like 3 or 4 bucks... And can be found at most electronics stores (IE electronics stores, not big box "electronics" stores like best buy).

You did smart: Would you rather
1. have a relay, or
2. have your Ipac/Keywiz/etc and USB port controller die?

Yes, I understand there are other ways to electically separate the two source voltages, but I will be going the relay and separate power source route myself.

mountain:


--- Quote from: DaOld Man on April 13, 2008, 07:00:42 am ---I think this would be the way to go if you want to use diodes, but I wouldnt do it this way.

--- End quote ---

How would you do it?



--- Quote from: protokatie on April 13, 2008, 11:02:31 pm ---
--- Quote ---The relay may be over kill.
--- End quote ---

I woundn't call it overkill. Separating two different voltage systems with a relay in this kind of application is what I would call insurance. Besides, a 12 volt rated relay costs like 3 or 4 bucks... And can be found at most electronics stores (IE electronics stores, not big box "electronics" stores like best buy).

You did smart: Would you rather
1. have a relay, or
2. have your Ipac/Keywiz/etc and USB port controller die?

Yes, I understand there are other ways to electically separate the two source voltages, but I will be going the relay and separate power source route myself.

--- End quote ---

I think the diodes are probably plenty to keep the counter isolated from encoder. I would not recommend supplying the counter a ground from any encoder unless the manufacturer says it can handle it. The Bosch relay I used pulls 150ma through the coil. I don't know what the coil in the counter draws but RandyT told me that on the Keywiz line of products, the inputs are sink rated for between 7 and 12 ma. I am sure the ground supplied from Keywiz can handle WAY more than that, but I don't think they were designed to power accessories.



DaOld Man:


--- Quote from: mountain on April 13, 2008, 11:22:39 pm ---
--- Quote from: DaOld Man on April 13, 2008, 07:00:42 am ---I think this would be the way to go if you want to use diodes, but I wouldnt do it this way.

--- End quote ---

How would you do it?


--- End quote ---

I agree with protokatie about keeping the encoder isolated from the counter and its power source.
But instead of using relays at 3-4 bucks each, i would use opto-isolators.
they arent much bigger than a diode and run around 50 cents to a dollar each. (depends on where you get them and how much it costs to ship, etc). Plus they make no noise, dont require suppressing diodes, and they should outlast a relay by several years.
You can also get dual opto-isolators which would supply both encoder inputs. they are two opto isolators in a single 8 pin DIP package. (Integrated circuit with 4 pins on each side.)
Plus, again agreeing with protokatie, I would much rather overkill something than under kill it.
Under killing something leaves the door open for it to bite you in the a**.
But if you feel comfortable about letting the encoder and counter circuits touch each other, then the diode drawing I showed should work fine. the relay shouldnt be necessary, but there are several ways to do something. Using relays would work too.
You could also use a relay to isolate the circuits, but the opto isolators will do the same thing cheaper and take up a fraction of the room.
I can post a drawing using optos if you'd like. I can also give you some links for more info about the optos. They are very easy to use, but do require some soldering skills.

mountain:


--- Quote from: DaOld Man on April 14, 2008, 01:54:09 am ---
--- Quote from: mountain on April 13, 2008, 11:22:39 pm ---
--- Quote from: DaOld Man on April 13, 2008, 07:00:42 am ---I think this would be the way to go if you want to use diodes, but I wouldnt do it this way.

--- End quote ---

How would you do it?


--- End quote ---

I can post a drawing using optos if you'd like. I can also give you some links for more info about the optos. They are very easy to use, but do require some soldering skills.

--- End quote ---

Thanks for the explanation. Please post or PM me what you have, you have my attention  :cheers:

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