Multi Mode Timer

[Boncuk]

Bonuk
You obviously haven't read the last couple of posts .
When I was referring to the relay or transistor output we were discussing the coin mechanism in an arcade machine, not the timer. Read the last couple of posts carefully before you post.

Hi Airman1,

that's definitely the best way to discourage (p. them off) any member to answer your posts.

There is a minor difference between input and output!

The output of your arcade machine is an input for your timer circuit!

If you don't name the "terminus technicus" properly you haven't understood a bit about electronics!

Failing to understand the problem is not anybody else's fault but only yours!

I suggest to contact the author of the article to answer your more than silly questions and handle the also more than silly problems you have.

Boncuk

 

[Reloadron]

I believe Ron's calculation would result in something a bit flaky or a marginal design. In other words, it may or may not work and doesn't give any margin of safety for aging and component tolerances.

The data sheet uses a typical operating current of 20 mA and Vr (max of 1.5). This is what I would use if I were doing a "Worst case" design which I didn't do, but I did consult the datasheet.

I agree, I should have allowed for more current. I just ran with what I posted and not real bright on my part.


Ron

 

[KeepItSimpleStupid]

Thanks Ron. At least someone looked at my suggestions.

Here https://www.electro-tech-online.com/custompdfs/2011/05/Sentinel2BTech2BManual2BV0.pdf is an EXAMPLE of a coin mechanism with open collector outputs. It states it can pull things within 1 V, not even the 0.6 V I used. Again, this is worst case designing using 1V instead of 0.6 V.

It's RARE to have a 5 V pulse, so I questioned.

BTW, I liked the kit.

 

[Airman1]

I have finally had a chance to give the timer kit a try on a coin mech

I have tried changing R1 to a 390 ohm resistor and a 300 ohm resistor but it doesn't seem to work.

I have measured the coin output pluse and it has a normal voltage of 2.2 volts and when a coin enters the coin mechanism the voltage drops to 2 volts.

All the documentation I have for the coin mech show the output voltage as 5 volts.

Have I missed something?

 

[colin55]

The output of the coin mech is a brief pulse, normally about 100mS. You need a CRO to see this and tell us what is happening.
You can try this:
Put a LED and 470R between the output and a 5v supply. Then from the output to 0v and let us know when the LED flashes.

You have to do things in a logical, systematic way, and this is not what you are doing. You have to know that is happening at the output of the con mech before you can hitch it up to another circuit.

Some mech have one pulse for $1 and two pulses for $2.

It is a coin mech or a comparator?

 

[Airman1]

It's a coin mech fully programable by PC , these one is used in high end coffee machines

It programmed up for $1.00 coin at the moment

Ok will give the LED a try and let you know the outcome

 

[colin55]

Does it accept multi-coins? Do you have to drop 20 $1 coins through the slot?

 

[Airman1]

Can accept multiple coins , but it is just programmed up for 1 x $1

 

[Airman1]

Ok LED just flashes very quickly once when the coin is inserted.

 

[colin55]

Can you program it to accept $1 and $2 coins AT THE SAME TIME (one after the other )

 

[colin55]

But you haven't told us how the LED was connected.

I realise you are not electronic, but you simply do not follow instructions.

 

[Airman1]

Yes can program it to do that no problem?

 

[colin55]

So, what is the output when a $1 coin is inserted, then a $2 coin

 

[Airman1]

LED connected from 5volt Dc rail on coin mech terminal (negative) , other end of LED in series with pot which I set as close as possible to 490 ohms then connected to coin mech pluse.

 

[Airman1]

LED just flashes on and then off and then on again and then back off

 

[colin55]

This is incorrect:

LED connected from 5volt Dc rail on coin mech terminal (negative) ,

You have to more accurate. Are you connecting the LED to the 5v rail or 0v rail (chassis).
The little flat mark on the side of the LED is the cathode. Let us know where this lead of the LED is connected.

Are you saying the LED flashes TWICE.

 

[Airman1]

Connected to O volt rail

The shorter lead on the LED is to connected to the O volt rail
The longer lead ion the LED is connected to the coin mech pulse

Yes LED flashes twice

 

[colin55]

That means the output "PULSES HIGH." You can see the pulse is about 100mS and it pulses twice. If you put 3 LEDs in series and they still illuminate (very dimly) it will prove the pulse is 5v. This is all the facts you need, without the need for a CRO.

 

[Airman1]

Thanks for your help colin55

So it should work then

 

[colin55]

The next thing you should do is connect the input of the optocoupler to the output of the coin mech via a 470R resistor. The opto will have a symbol of a LED on the input terminals and this LED takes the exact same place as the LED you were previously testing and the 470R takes the exact same place as the test-470R
Then connect a LED and 470R to the output of the opto by connecting one of the output leads to 0v and place a LED and 470R on the other output with the 470R going to 5v and see if the LED illuminates. You may have to reverse the output leads if you cannot identify them properly.