* User Profile

Welcome, Guest. Please login or register.

Login with username, password and session length

Who's Online

  • *Users: 0
  • *Guests: 12
  • *Total: 12

Author Topic: PoKeys and Potentiometer Jitters  (Read 297 times)

Offline MistyBlue

  • Forum GURU
  • *
  • Posts: 72
  • 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.
My Never Ending 737 Sim

Offline mickc

  • Forum GURU
  • *
  • Posts: 428
  • 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: 72
  • 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 »
My Never Ending 737 Sim

Offline ifeliciano

  • Forum GURU
  • *
  • Posts: 59
  • 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 »




Will Depart in...

Recent Posts

Windows 7/10 updates
by Ed
[Today at 05:17:24 PM]
What have you done for your simulator today?
by Joe Lavery
[Today at 12:02:26 PM]
Beechcraft Speaker Grills
by Joe Lavery
[Today at 10:49:59 AM]
Tons of 737 OEM stuff for Sale
by XOrionFE
[January 17, 2018, 12:22:29 PM]
737-800 Arduino X-Plane Build
by jackpilot
[January 16, 2018, 07:27:12 PM]
Jeehell: The AP does not follow the lateral guidance from the FD
by emulov
[January 16, 2018, 02:58:37 PM]
Real Harrier sim, voice comms help needed
by RayS
[January 15, 2018, 07:36:17 PM]
My Generic GA Build
by fsaviator
[January 15, 2018, 12:22:39 PM]
Flight Control Pot bleedover
by brianwilliamson
[January 15, 2018, 12:48:59 AM]
SOLD, for sale: OEM cables + connectors from FWD OVHD 737 classic
by jameas
[January 14, 2018, 03:28:59 PM]
Cockpits for Sale...mine?
by blueskydriver
[January 14, 2018, 07:28:29 AM]
Mickey's Flightdeck - A Boeing 737-800 Cockpit on Youtube
by Caflyt
[January 12, 2018, 05:17:32 AM]
Projector issue advice
by fsaviator
[January 09, 2018, 11:36:18 PM]
CPFlight MIP board
by fsaviator
[January 09, 2018, 11:33:17 PM]
PFC Yokes and Pedals, B727, and B737 Cockpits For Sale
by jackpilot
[January 09, 2018, 08:30:14 PM]
Weather set problem
by BABA767
[January 09, 2018, 05:46:56 PM]
737-800 aluminium MIP backplate
by kurt-olsson
[January 09, 2018, 02:30:31 PM]
Sismo equipment suite with WideTraffic - failed Ethernet interafaces
by FredK
[January 09, 2018, 11:14:49 AM]
I want your feedback!
by archen
[January 08, 2018, 02:22:52 PM]
B767 MIP
by 737NGer
[January 07, 2018, 09:54:02 AM]
Ultimate Traffic Live across a network
by DaveA320
[January 06, 2018, 09:56:08 PM]
Boeing 737-800 MIP announciators
by 737NGer
[January 06, 2018, 10:56:11 AM]
German B738NG Homecockpit-Projekt
by MjTom
[January 06, 2018, 09:05:26 AM]
737 toe brake force
by Gallie
[January 05, 2018, 11:00:52 AM]
Online ATC
by Aerosim Solutions
[January 03, 2018, 07:22:31 PM]
Boeing 737-800 Next Generation Simulator
by jackpilot
[January 03, 2018, 07:05:41 PM]
737 Headset and intercom connections
by fsaviator
[January 03, 2018, 06:23:03 PM]
My pit now on Youtube
by Stinger2k2
[January 03, 2018, 02:30:12 PM]
Issue uploading photos with post
by fsaviator
[January 03, 2018, 06:32:36 AM]
P3D v4 and WideTraffic crashing
by gregh
[January 02, 2018, 05:51:31 PM]