Main > Main Forum
HAPP Analog pedals to A-pac from ultimarc
<< < (5/6) > >>
mytymaus007:
Thanks for all your tech support I should of save the whole weekend by just buying a multimter before I posted. It turned out to be a bad POT. Who new figured it wasnt because it was brand new! Some new things are dfective from factory thank to HAPP their sending a new POT! GO HAPP!
PL1:

--- Quote from: mytymaus007 on May 29, 2012, 11:53:52 pm ---Thanks for all your tech support I should of save the whole weekend by just buying a multimter before I posted. It turned out to be a bad POT. Who new figured it wasnt because it was brand new! Some new things are dfective from factory thank to HAPP their sending a new POT! GO HAPP!

--- End quote ---

So it was just a bad pot, or was having a discontinued version of the board part of it?


Scott
Mysterioii:
So Andy, the pins on the board labelled 1DOWN, 1LEFT, 2DOWN and 2LEFT are really +5V supplies and 1UP, 1RIGHT, 2UP and 2RIGHT are sense lines correct?  I had seen a thread that used that image a few weeks ago and the labels confused me, since I do understand how pots work.

Just a little more discussion for anyone who might be interested, but when you connect one fixed leg of a pot to ground and the other to some voltage, then measure the voltage at the wiping arm, it's essentially a variable voltage divider.  Adjust it fully one way and you'll hit the ground rail, adjust it fully the other way and you'll hit whatever your input voltage is, and at any other point along the way it'll be some voltage in between as Andy says.  Which is why it confuses me a little when people say "make sure you're using a replacement pot with the exact same resistance"...   It really shouldn't matter all that much so long as there's no additional load resistance between the supply and the high rail of the pot and you don't pick one with such a low resistance that your supply can't handle the current required to drop the specified voltage across it.  In general if you connect a 5V supply to one side of a 1K pot or a 10K pot or a 1M pot and the other side to ground, then if the wiper arm is perfectly centered all three will read 2.5V at the wiper.
BadMouth:

--- Quote from: Mysterioii on May 30, 2012, 09:08:01 am --- Which is why it confuses me a little when people say "make sure you're using a replacement pot with the exact same resistance"...   It really shouldn't matter all that much so long as there's no additional load resistance between the supply and the high rail of the pot and you don't pick one with such a low resistance that your supply can't handle the current required to drop the specified voltage across it.
--- End quote ---

Depends on the interface.  Gameports for example, do measure resistance (0-100k).
Most modern gamepads use 10k pots and have no calibration. 5k is center.
Mysterioii:
Ah, that explains that.  Thanks for the info!  Not sure why that method would be preferred over just measuring a voltage with an analog input but I'll take your word for it.
Navigation
Message Index
Next page
Previous page

Go to full version