Cockpit

* User Profile

Welcome, Guest. Please login or register.

Login with username, password and session length

Who's Online

  • *Users: 2
  • *Guests: 38
  • *Total: 40

WORLDFLIGHT 2017 - TEAM USA SUPPORTERS (HERO'S)


We would like to thank our HERO'S for Donating to support WORLDFLIGHT Team USA - 2017

- Anders Helin, James Hillegus, Joaquin Fuenmayor, Joe Lavery, James Williams, Fred Kurasiewicz -
- Sam Llorca, Trevor Hale, Edwin Burton, Vincent Thomas, Gwyn Perrett, Karen Combs, John Combs -
- Ray Sotkiewicz, Scott Wegner, Barb Hale, Warren Soeldner, Gary Seymour, David Bullock, Craig Allison -
- Greg Hembree, Kyle Hathaway, Darian Phillips, John Miller, John Ziegler, Doug Snow, Mike Sherick -
- Marco Fernandes, Don Desfosse, Albert Zaharias, Roy Stewart, Steven Cherry, Mick Cliffe -
-
Thanks to all of you, so far this year we have raised

$3,150.00 USD


Author Topic: PoKeys and Potentiometer Jitters  (Read 204 times)

Offline MistyBlue

  • Forum GURU
  • *
  • Posts: 59
  • Karma: +1/-0
  • Aviation Enthusiast
  • First Name: Tony
  • Home Location: Texas
PoKeys and Potentiometer Jitters
« on: October 18, 2017, 06:11:39 PM »
So last night I wired up the cabin temperature pots in my 737 overhead to my PoKeys 57E card.  They're working, but very jittery in Prosim, with regular spikes of the virtual knobs. 

What is interesting is loading up the PoKeys software and analyzing the analog ports without the knobs attached the values are still jittery.  Makes me think something is up with the power delivery.  But I just replaced my cheap-o power supply with a much better one and still the same thing.

Anyone run into this and have a solution?  Low pass filter somewhere?

Attached is a crude diagram of how they're wired.

Offline mickc

  • Forum GURU
  • *
  • Posts: 415
  • Karma: +0/-0
  • Aviation Enthusiast
  • First Name: Mick
  • Home Location: VIC, AU
Re: PoKeys and Potentiometer Jitters
« Reply #1 on: October 18, 2017, 07:04:08 PM »
In the Pokeys software there is a slider for the Analog filter value, slide this to the right to slow it down/smooth it out.

Also just double checking the power to the Pokeys, in your diagram it looks like you are feeding the pots and the Pokeys card with the same 3.3v power supply?
The Pokeys E cards need 5v, then you must connect the pots to the on-board 3.3v terminal, not an external source.

Offline MistyBlue

  • Forum GURU
  • *
  • Posts: 59
  • Karma: +1/-0
  • Aviation Enthusiast
  • First Name: Tony
  • Home Location: Texas
Re: PoKeys and Potentiometer Jitters
« Reply #2 on: October 18, 2017, 07:10:56 PM »
Thanks Mick.  Found that analog filter and that seems to have eliminated the spikes, and reduced the jitters significantly at about the half setting.

Sorry, the power in my diagram is a little off.  I'm feeding the pots with 3.3v off the main power supply, and feeding the PoKeys with 5v off the main power supply.  I'll try pulling the 3.3v off the PoKeys instead.  Easy fix and may help things further.

UPDATE:  Connected the 3.3v off the PoKeys and same jitters.  The filter solution is good enough.  At least the real knobs aren't jittery.  THAT would drive me nuttier than I already am, lol.
« Last Edit: October 18, 2017, 07:16:48 PM by MistyBlue »

Offline ifeliciano

  • Forum GURU
  • *
  • Posts: 28
  • Karma: +0/-0
  • Aviation Enthusiast
  • First Name: Ivan
  • Home Location: Arlington, Texas
Re: PoKeys and Potentiometer Jitters
« Reply #3 on: October 19, 2017, 03:30:52 PM »
Line noise, perhaps? Ground loop? Is everything grounded properly?

I've recently completed a CNC build, so during the controller build, "grounding" came up a lot. Can you run a small capacitor, to minimize noise, like in page 99 in the Pokeys manual?



« Last Edit: October 20, 2017, 09:57:55 AM by ifeliciano »

 

COUNTDOWN TO WF2018


WORLDFLIGHT TEAM USA

Will Depart in...

Recent Posts

FDS-O2 Panels For Sale!!! Realiable Realistic Panels!!!
by blueskydriver
[Today at 01:54:17 AM]
737-800 Arduino X-Plane Build
by kurt-olsson
[November 18, 2017, 05:38:33 PM]
Flyengravity order process
by blueskydriver
[November 18, 2017, 04:24:36 PM]
Another 737 builder :)
by 737NGer
[November 18, 2017, 10:41:42 AM]
Home Built Full B737-200 Sim for Sale - Richmond, BC Canada
by Bob Reed
[November 17, 2017, 10:03:12 PM]
Down memory lane - What was the first home cockpit SIM you saw?
by RayS
[November 17, 2017, 02:59:17 PM]
New supplier for your sim
by Fcoq
[November 17, 2017, 02:44:35 PM]
Oh Boy!!
by Bob Reed
[November 17, 2017, 01:37:54 PM]
FDS Shell Black or Raw Aluminum
by bernard S
[November 16, 2017, 06:15:12 PM]
B737 Startswitches
by archen
[November 16, 2017, 12:17:22 PM]
Worldflight Perth Crew news
by Trevor Hale
[November 16, 2017, 07:21:04 AM]
Worldflight 2017 Conclusion
by Trevor Hale
[November 15, 2017, 08:31:40 PM]
Jorge from NAVCOM
by Caflyt
[November 15, 2017, 04:50:25 PM]
Wanted 5inch screen
by fsaviator
[November 14, 2017, 08:41:16 PM]
737 FWD Overhead Switch Diagram
by MistyBlue
[November 13, 2017, 10:16:15 AM]
Sim out of the hangar
by Fcoq
[November 13, 2017, 10:05:13 AM]
Question for those that have converted real TQs
by mickc
[November 12, 2017, 02:47:54 PM]
Hey - PFD/ECAMS TFT
by BGStudios
[November 12, 2017, 01:22:55 PM]
Camera setup?
by Trevor Hale
[November 12, 2017, 07:48:26 AM]
Sim Progress (BAe146)
by Erj145sim
[November 11, 2017, 08:28:20 PM]
Where to order custom metal rod with predrilled holes.
by bernard S
[November 11, 2017, 11:48:38 AM]
737NG Single Seat Trainer "Starter Kit" :-)
by Captbrian
[November 10, 2017, 08:30:12 PM]
B737 DIY Gauges servo gears ??
by mickc
[November 10, 2017, 07:52:07 PM]
Delta 209
by blueskydriver
[November 10, 2017, 07:06:30 PM]
WorldFlightUSA - UAL 1120 Schedule
by Trevor Hale
[November 10, 2017, 03:53:00 PM]
PFC Jetliner Column Yoke USB
by RayS
[November 08, 2017, 03:49:53 PM]
Real-World Freq's
by Caflyt
[November 08, 2017, 05:09:03 AM]
My 737 Desktop Cockpit
by Bob Reed
[November 07, 2017, 12:44:40 PM]
Mickey's Flightdeck - A Boeing 737-800 Cockpit on Youtube
by Extraterra
[November 06, 2017, 05:01:57 PM]
XPlane and Avionics softwares.
by kurt-olsson
[November 06, 2017, 01:59:00 PM]