Results 1 to 5 of 5
Thread: Levers: Analogue Vs Digital
-
11-04-2010, 07:59 PM #1
- Join Date
- Oct 2010
- Location
- Perth
- Posts
- 52
Levers and wheel: Analogue Vs Digital
Hi everyone,
Ive been gathering interface ideas from http://www.737ngproject.be . Particularly the throttle unit. Wondering why micro-switches where used for the flaps and trim, instead of analogue axis?
From what i can gather, a clothes peg has been utilized in such a way that it only activates a switch when the lever is traveling one direction, giving the other switch (which activates in both directions), a different output. Thus, flight sim knows what direction the lever is traveling in.
Very clever, but seems unnecessary, when you can do the same with a potentiometer.
I see that potentiometers have been used for the spoiler, and throttle.
Am i correct in my understanding of the switch system, at the before-mentioned web site?
Do micro switches offer some advantage over a simple axis?
Regards
Tomcat
-
11-06-2010, 05:39 PM #2
- Join Date
- Oct 2010
- Location
- Perth
- Posts
- 52
Re: Levers and wheel: Analogue Vs Digital
Well i will be lame and answer my own question.
Trim cant be a pot because you need "infinate spin" on the wheel.
So digital input for the trim(incremental trim up/down). Either in the form of a micro-switch system, or rotary pulse switch (mouse scroll wheel)
The flap lever can be either be a multi switch (a micro-switch at every increment), or potentiometer. I guess the decision there would lie in what interface you have.
goodnight
-
11-06-2010, 06:50 PM #3
- Join Date
- Oct 2009
- Location
- Juneau, AK
- Posts
- 553
Re: Levers and wheel: Analogue Vs Digital
Sorry I could not help with you original question. Is it the 737 that needs infinite spin? Most aircraft trim have physical limits that stop them, and as such are perfectly suited for pots. Many people use either multi-turn pots or gearing to mechanically reduce the arc.
It looked like the clothes pin was to create a mechanical encoder, but my Belgian or French is bad, and I could not figure out what the true intent of that was, or why they did not just use a rotary encoder.
Everything else was awe inspiring though!
Reidhttp://juneaucessnasim.blogspot.com
N58243 (virtual)- Low and Slow...
-
11-07-2010, 12:00 AM #4
- Join Date
- Oct 2010
- Location
- Perth
- Posts
- 52
Re: Levers and wheel: Analogue Vs Digital
I was under the impression they did, but im new to this, and probably wrong
"google translate" helped me out a bit. I think his trim works using 2 micro switches.
One of them is pushed when the wheel is turned (both directions),
and the other is pushed (by the clothes peg) only when the wheel is spun in one direction, giving the first switch a different output.
If i am right, i would love to know the wiring diagram, i mean both switches must be connected to each other some how.
So maybe there are "stops" to his trim wheel. That would explain the use of the bike chain.
Regards
Tomcat
-
11-07-2010, 01:13 PM #5
- Join Date
- Nov 2010
- Location
- UK
- Posts
- 16
Similar Threads
-
Matrox TH2go Analogue being sold
By richard hutchinson in forum Cockpit Outside VisualizationReplies: 0Last Post: 09-19-2010, 05:16 AM -
Digtal to Analogue Gauges
By verticallimit in forum I/O Interfacing and HardwareReplies: 4Last Post: 05-07-2010, 04:35 PM -
analogue software gauges, anyone?
By stabell in forum General Builder Questions All Aircraft TypesReplies: 18Last Post: 10-23-2008, 07:22 PM -
DH2GO/THH2GO Analogue or Digital?
By Drewsta in forum Cockpit Outside VisualizationReplies: 6Last Post: 06-28-2008, 07:32 AM -
Analogue output?
By MalcolmH in forum FS2Phidget UsersReplies: 8Last Post: 12-02-2004, 03:57 AM
Beautiful Womans in your town for night
B_34 TOGA takeoff