capturing change states in pm

A forum for open discussions. Feel free to discuss any and all elements of Flightdeck Building. NB: This section is for individual builders to openly discuss issues that may or may not pertain to FDS. Organizations/Political Groups or Commercial Entities Will require approval prior to posting. Prior Approval From FDS required prior to posting items for sale. No Exceptions.

Moderators: Curtis, Jetcos

flyboy01
Posts: 89
Joined: Sat May 06, 2006 7:42 pm
Location: Newcastle Australia

capturing change states in pm

Post by flyboy01 »

Hi All.
Not sure if i can post this here or if it is considered out of ethics, but let me start by saying that i do support fds in all its entirity and i am using the fds interfaceit cards. But i am also using the open cockpits io cards for situations that i have not been able to work out on the sys cards. for example the sys cards put out a pulsed 2.5 volt for the outputs which i have found i am unable to trigger a relay from. plus the fact i can only get hold of a 5 volt relay. This is where the iocards come in handy for me. I am using this for the engine start switch flick back mechanism. Has anyone got any experience with these cards and does anyone know how to capture the offset change state in pm systems to trigger an output? if this post is not welcome please let me know and i will remove it
Thanks in advance
Trev

pcos
Site Admin
Posts: 2285
Joined: Mon Nov 03, 2003 8:39 am
Contact:

TekWorx

Post by pcos »

Brent dropped off the first SYS board that is designed to mate with the group and allow real aircraft parts or components to connect.
VERY robust item and capable of 8 devices and various voltages.
We are using it on a Real Nose that is going from a -500 series to an NG.
It is running the Engine Start Switches and Stick shakers right now. We will add more elements as we need them.
It is not likely a "Cheap" card by price but it is robust as I mentioned.
As far as the OPEN CARDs go I am not sure I can help. Perhaps someone can message or email you on that.
PC

vidarf
Posts: 504
Joined: Fri May 12, 2006 11:37 am
Location: Narvik, Norway
Contact:

Post by vidarf »

Try the forums at opencockpits.
We've had a discussion about just this topic in this forum, and somebody (can't remember who it was at the moment) came up with a solution utilizing darlington-coupled transistors. It went a bit over my head, but seemed easy enough. You might want to do a search. :)

pcos
Site Admin
Posts: 2285
Joined: Mon Nov 03, 2003 8:39 am
Contact:

FDS-SYS-R1

Post by pcos »

FDS-SYS-R1 is now posted on teh interfaceIT link.
Stock this month.
Picture to follow.
PC

flyboy01
Posts: 89
Joined: Sat May 06, 2006 7:42 pm
Location: Newcastle Australia

Post by flyboy01 »

Thanks Vidarf.
Will search but i think i am getting close on my soic code. Just need to add a line or 2 more and should work. I will keep posted on my progress or falure whichever occurs.
Kind regards
Trev

dcutugno
Posts: 60
Joined: Tue May 17, 2005 1:33 pm
Location: Italy

Post by dcutugno »

I did it a long time ago with OC cards....

flyboy01
Posts: 89
Joined: Sat May 06, 2006 7:42 pm
Location: Newcastle Australia

Post by flyboy01 »

Hi All,
I have had sucess. I managed to get the right combination of sioc programming after hours of trial and mostly error. But the good news is that i finally have functional engine start switches that auto flick back to off after start. The answer was a simple one and i was trying to make it more complicated than was nesissary. Thanks to all for their input and help. Much appreciated.
Happy flying and safe landings
Trevor Wimmer

jsheph
Posts: 53
Joined: Sat Mar 04, 2006 10:32 am
Location: Charlotte, NC

Post by jsheph »

Are you using real start swiches or a home made solution?
John Shepherd

melnato
Posts: 1087
Joined: Sat Feb 04, 2006 10:43 pm
Location: Australia
Contact:

Post by melnato »

Yep...please explain...you cant get away that easy :)

Nat

flyboy01
Posts: 89
Joined: Sat May 06, 2006 7:42 pm
Location: Newcastle Australia

Post by flyboy01 »

Hi all,
I am using home made switches (12 position rotary switch) modified by the shaft drilled out and a new extended shaft manufactured and installed. Then the simple adition of a servo arm on the end of the shaft and away we go. Photos attached
Image

Image

jsheph
Posts: 53
Joined: Sat Mar 04, 2006 10:32 am
Location: Charlotte, NC

Post by jsheph »

Fantastic Work!!!! Now you know your going to haver to put together a tutorial, right??????

What type of solenoid are you using?
John Shepherd

flyboy01
Posts: 89
Joined: Sat May 06, 2006 7:42 pm
Location: Newcastle Australia

Post by flyboy01 »

Tutorial should be no problem to put togeather.
Will sit down and do one when i get a chance. Hang tight on this as it wont be long.
As for the solenoid, I used a 12 volt push type solenoid From JAYCAR in Australia. www.jaycar.com.au
Aprox $30aud each. I am writing an sioc code to hopefully be able to remove the micro switch from the circuit. Saves a bit of money and time. If anyone has any further questions in the mean time do not hesitate to pm me and i will do my best to provide an answer. And i will start on a tutorial.
Kind regards
Trevor Wimmer

melnato
Posts: 1087
Joined: Sat Feb 04, 2006 10:43 pm
Location: Australia
Contact:

Post by melnato »

Sorry Trev...but how do the rotatry switches auto flick back?

Nat

jsheph
Posts: 53
Joined: Sat Mar 04, 2006 10:32 am
Location: Charlotte, NC

Post by jsheph »

Fantastic thanks Trevor, looking foreword to seeing your tutorial.
John Shepherd

flyboy01
Posts: 89
Joined: Sat May 06, 2006 7:42 pm
Location: Newcastle Australia

Post by flyboy01 »

Hi Nat,
They work by capturing a change state in pm systems.( if you watch the graphic, the graphic shows the switch auto returning to the off position despitr what your physical switch position is. This change state is then programmed to activate an output at that exact time which operates a 5 volt relay and able to use 12 volt through the switch part of the relay to power the solenoid. The solenoid pushes on the servo arm and forces the switch to the off position.
Kind regards
Trevor Wimmer

Post Reply