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Using Arduino => General Electronics => Topic started by: DocStein99 on Oct 20, 2017, 09:26 pm

Title: A good switch idea for my trim-switches for custom r/c ground station
Post by: DocStein99 on Oct 20, 2017, 09:26 pm
I am trying to build an openTX / clone transmitter for an R/C ground station - using atMega2560.  The suitcase houses a LCD screen, sticks, levers, knobsI have to  pick out some switches or buttons to use for trim switches on the control panel.  The trim switch is like a power-window switch, 3 (or more) pins.   

I was actually trying to find the short duck-bill type (rocker? - I do not know what industry term is).  I ordered some 3p momentary switches from eBay:

Common economy 3p on off on switch (https://www.ebay.com/itm/Miniature-Momentary-On-Off-On-Toggle-Switch-Car-Dash-Dashboard-Truck-Boat-SPDT-/182842654824?hash=item2a92458068:g:hMAAAOSw-xVZ6Wi3)

(the link above): These switches really take ALOT of physical force, and I often need TWO HANDS to toggle the over sized spring.  They would probably do the job, but I would not feel confident showing off my skills to someone else, by choosing these very common switches.

I was hoping anyone had ideas, of nice up/down momentary switches they seen or used?  Something that obviously can be toggled up/down with just one finger.  Size is not a big concern, I am not designing a tiny box , but I do have trouble finding switches that either are tiny PCB size, or GIGANTIC - MAME/ARCADE sized switches.

Any switches, buttons you seen which are your favorites, or good ideas to use are welcome, please - I enjoy actually collecting switches.  I'm trying to make my ground station look like those Star-Wars control panels from the death-star, or inside of the cockpit of Millenium Falcon.


Title: Re: A good switch idea for my trim-switches for custom r/c ground station
Post by: promacjoe2 on Oct 20, 2017, 10:10 pm
Are these terms which is going to be used to control RC airplane, or something else.

a little more information would be helpful.
Title: Re: A good switch idea for my trim-switches for custom r/c ground station
Post by: DocStein99 on Oct 20, 2017, 10:26 pm
I have many r/c's.  2 wheeled, and a quadcopter are primarily going to be used.  The wheeled are large, inbetween size of riding and push mowers.  Quadcopters are testing, have a small one and building larger 24" span with 12" props for aerial photography.

I am not exactly sure where your going with or how in-depth you need to know about the RC devices, that my transmitter will be controlling.  My books for my designs are stacked about 2 feet high from the last 9 months to the very least.
Title: Re: A good switch idea for my trim-switches for custom r/c ground station
Post by: promacjoe2 on Oct 20, 2017, 11:35 pm
Switches are normally used for on/off, All or nothing scenario. Trim controls are normally more precise, Increasing or decreasing the PWM output by a very small amount. A potentiometer/variable resistor would be better for this. What processor are you using and how did you connect your primary controls.
Title: Re: A good switch idea for my trim-switches for custom r/c ground station
Post by: DocStein99 on Oct 20, 2017, 11:46 pm
It's an Arduino Mega2560.  I'm doing an openTX project.  The schematic calls for switches (or momentary buttons).  I understand - yes maybe POTs better, except changing this is more involved.

If I want to change it to use POTs instead, I have to sort through the 10,000k lines of code from 30+ programmers, after figuring out which of the 8 other software packages the git-hub readme explains that I must install, just to compile the project myself.  To get my stuff done some time this year, I will just be using their pre-compiled .hex files as software and deal with my customized modifications when time permits.
Title: Re: A good switch idea for my trim-switches for custom r/c ground station
Post by: Wawa on Oct 21, 2017, 01:56 am
These switches really take ALOT of physical force, and I often need TWO HANDS to toggle the over sized spring.
Had some cheap clones who did that.
Good ones take almost no force to move the lever.
Leo..
Title: Re: A good switch idea for my trim-switches for custom r/c ground station
Post by: DocStein99 on Oct 21, 2017, 06:32 am
Here is MY example of a GOOD switch:

eBAY / omron switch, with LED - as used in 1980 Knight Rider control panel. (https://www.ebay.com/itm/SWITCH-HINGED-SPST-YLW-ylw-LED-Part-B3J3300-/391760376787?epid=1234206310&hash=item5b36bcf3d3:g:Yf8AAOxy5jxSa8Ck)

It has a very gentle CLICK, WITH a LED - and was actually used on one of America's greatest icons: "Knight Rider".  It has everything going for it.  They are used in electric musical instruments, as well.  Unfortunately, they are EXPENSIVE.  So I have to harvest them - setup snipe scans on eBay to be notified when any new item priced below a value is found on a search, and it takes forever.  They are expensive. The only way I can get them is to prowl for deals and buy when price is right, since I need like 20 switches to make any one of a number of my projects.  They are as wide as a thumb, so using them for trim switches is not ideal since I have no purpose for LED indicators on that function.

Now after I re-read my own text, I realize - there are cherry mx switches, used on computer gaming keyboards, all the time - which are cheap, since they are common.  I can fabricate my own button heads for them, or pick from the plethora of ones they already make.



Title: Re: A good switch idea for my trim-switches for custom r/c ground station
Post by: dougp on Oct 22, 2017, 01:13 am
Marquardt (https://us.marquardt.com/en.html) has some nice offerings.