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Button Mods for Pinball games on MAME cab
BobA:
NC means the switch contact is closed if the switch is not activated. If you use the NC contacts and have the plunger touching the switch when at rest then the contact is open until the plunger is pulled away. At that time it closes and makes contact. When the plunger is let go it comes to rest on the switch and the NC contacts open again.
Dazz:
Here is how my plunger is on my pincab, but I used the same when this was installed in my MAME cabinet.
Optical switch plunger.
The black triangle looking thing is an optic that is reading the tip of the plunger. It is wired to a PCB that has power and a de-bounce circuit. The power is 5v being pulled from my opti-pac, and the input is wired to my ipac. When pulled back the switch activates and when the plunger is moved back into place it triggers the shot. While this doesn't allow for precise plunger control there is no physical contact with the plunger.
Hituro:
--- Quote from: BobA on December 18, 2010, 10:35:37 am ---NC means the switch contact is closed if the switch is not activated. If you use the NC contacts and have the plunger touching the switch when at rest then the contact is open until the plunger is pulled away. At that time it closes and makes contact. When the plunger is let go it comes to rest on the switch and the NC contacts open again.
--- End quote ---
Yeah that makes sense now, thanks for clearing that up. now that I re-read NC's post, I was misreading it and that's where i got condfused.
And DAZZ, that's awesome! I might just have to get me one of those. Still debating if I want it on there. Some friends of mine think it will take away from the overall look of the cab. I want it more or less for personal use in that I like pinball and I like pulling the plunger for shots. But I know in newer pinball games like Indiana Jones, there is just a button to press or a trigger to pull. Still debating though... that only makes me want one more though ;p
Hituro:
--- Quote from: Dazz on December 19, 2010, 03:14:38 pm ---Here is how my plunger is on my pincab, but I used the same when this was installed in my MAME cabinet.
Optical switch plunger.
The black triangle looking thing is an optic that is reading the tip of the plunger. It is wired to a PCB that has power and a de-bounce circuit. The power is 5v being pulled from my opti-pac, and the input is wired to my ipac. When pulled back the switch activates and when the plunger is moved back into place it triggers the shot. While this doesn't allow for precise plunger control there is no physical contact with the plunger.
--- End quote ---
I really like this setup. Can you tell me where you got the parts for something like this? Specifically the optical device? And is it necessary to use the Opti-pac for this? I mean, I'm sure Andy is gonna love that I've been buying so much from him lately :D
Dazz:
Unfortunately, a lot of the parts that I used are obsolete. I'm sure there are newer parts available, but I don't know enough to match up the correct parts. I'm sure any 5v source would work, not only the opti-pac. I'm actually using the 5v from my Led-Wiz now, but I was also using the 5v off the computer power supply.
Pinball Plunger Circuit Parts List
IC1 74LS14N (Mouser P/N# 512-DM74LS14N)
R1 1K Ohm ¼ Watt Resistor (Radio Shack)
R2 220 Ohm ¼ Watt Resistor (Radio Shack)
C1 10 uF Electrolytic Capacitor (anything above 10v)( Radio Shack) (Check polarity!)
LED1 Green LED (Radio Shack)
SL1 Computer Disk Drive Power Connector(Mouser P/N# 538-15-24-4345)
JP1 3 Position Jumper (Mouser P/N# 544-CA-S36SP100 and 151-8000 jumper)
X1 4 Position Phoenix Connector(Mouser P/N# 651-1729144)
Opto-switch Sharp GP2L24 Reflective Opto-switch
R3 Resistor in harness - 300 Ohm ¼ Watt Resistor
R4 Resistor in harness - 10K Ohm ¼ Watt Resistor
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