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Dr. StrangeLiPo ... or How I Learned To Stop Worrying & Love The Battery !
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 Posted: Thu May 11th, 2017 06:33 am
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Helmut
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@Michael
Don't let the specs fool you. The PCB alone is roughly 20x20x5mm³, if you take the wires and plugs off. It works with EVERY R/C receiver. On the downside is the size of the  receiver you'll need too, that is at least another 20x30x5mm³, contact pins and housing removed. That receiver works with every DSM2 transmitter. Only prerequisite is, that you have to have at least three channels.
Now compare that to DT's space requirements.

Last edited on Thu May 11th, 2017 06:38 am by Helmut



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 Posted: Thu May 11th, 2017 10:24 am
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Si.
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" I still want to see your shopping list for all of the parts.  What transmitter do you use with that tiny receiver? "



Hi Michael :wave:



When I decided to have a go at R.C. I wanted to find an economical & workable solution.

I thought that a 'decent' workable solution, might be possible for about £15.

This was when I was still looking at a certain type of car/transmitter, to use for parts.



Having made the decision to go for a 'modular' system, rather than 'on one board', I needed a cheap transmitter.

I actually bought a 2.4GHz transmitter recently, for £0.99p + £3.45p P&P.

I could not resist it at the price, as it also looked simple & ideal for 'customization'.

Whether it will work with the receiver I have ordered, is as yet unknown.

Also, for most people, the option of picking up a transmitter for this price, is pretty minimal.



In deciding not to go for the initial 'cheap car' option, my budget 'realistically' possibly went up by about £10.

If the transmitter I have works OK, then I am 'on budget' to do the lot for £15.

If the transmitter I have doesn't work OK, then I will need to get the 'FlySky' transmitter.

This means my budget will increase, to an 'all in' price of around £25.



The setup will still be 'modular', so any toasted-parts can be easily & cheaply replaced.

Also the 'availability' of parts is important as well.

The 'FlySky' TX. & Rx. is not only very cheap at less than £20 inc. P&P, but very widely available.



I thought I would slowly but surely, document my 'economy system' for those who may be interested.

One thing I aint, is QUICK !

Spare time, other models to be made etc. etc. means this isn't 'a race' for me.

I would just like to come to the cheapest & highest-quality solution that I can reasonably find.



£15 or perhaps more realistically £25 spent, is an encouragement to those who might not want to spend 'the big bucks'.

Since I am still waiting for many parts to arrive, it is obviously hard to recommend anything.

Although what I have speced. is not 'rocket science' & is essentially tried & tested R.C. practice.



The bottom-line for this project, will however, always be quality AND cost !

Moose Mountain money, goes on modeling materials, NOT microchips !! ;)



:moose:



Si.



This is the transmitter that 'went for a song'. ;)

I have it here & have had a good 'nose around' inside it ! :shocked:





This is the 'FlySky' Tx. & Rx. twin-set, available for under £20 inc. P&P.







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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Thu May 11th, 2017 10:59 am
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Helmut
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Nice summation, but I think you forgot to take into account that for that receiver you need an additional 5V-supply or BEC, as it needs at least 4.8V, not exceeding 6V ( This is the standard R/C spec. ). Normally the speed-controller's logic takes its supply from the receiver, so that BEC must be able to supply both. Not a great issue, but to be kept in mind.
When I was still in 1:20 Outdoor Railroading, all my BPRC locos were equipped with components similar to Si's listings. You just have the room there for all that modularity, which I doubt will be available in 1:35.
May I also humbly remark that for RR puroses, those car transmitters are almost unusable in their 'as-is' form? The trigger-type speed control doesn't work so well with locos, when you want some more than on-off operation. Forward and reverse swings are different and do not give the same speed range. The spring-loaded centered steering wheel is a wee bit better, but still you have only some 30..45° degrees of control adjustment.

Last edited on Thu May 11th, 2017 11:13 am by Helmut



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 Posted: Thu May 11th, 2017 11:29 am
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Si.
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Hi Helmut :wave:



The 5 Volt logic-supply, is made by the E.S.C.s that I have speced.



So ... inside the loco, there needs to be :-

Receiver.

Electronic Speed Controller.

Battery.

DC-DC 9 Volt step-up regulator.



The parts should easily fit in the 1:35n2 Plymouth ... I think.

The R.C.ing business is generally a 'shoehorning' operation, I have noticed.

Unless of course you are doing perhaps 'O' or 'G' standard-gauge, or have huge tenders etc.



I have both a 'fixed' & 'adjustable' DC-DC step-up regulator coming.

Both extremely small.

More on these soon.

One cost £0.57p inc. P&P

The other £1.28 inc. P&P



:moose:



Si.



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Thu May 11th, 2017 11:34 am
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Si.
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" for RR puroses, those car transmitters are almost unusable in their 'as-is' form?
The trigger-type speed control doesn't work so well with locos, when you want some more than on-off operation.
Forward and reverse swings are different and do not give the same speed range.
The spring-loaded centered steering wheel is a wee bit better,
but still you have only some 30..45° degrees of control adjustment."



Hi again Helmut :wave:



Sounds like I might as well just give up then ...

... and simply go back to using my reliable, cheap & easy to wire-up, Tri-ang resistance-controller.



Maybe I should get out, while the going is good ...

... I've only wasted £15 so far.

Perhaps I could sell the parts on eBay & not loose too much money ?



:f:



Si.








____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Thu May 11th, 2017 01:19 pm
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W C Greene
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Gee, I didn't know that the "r/c car" pistol transmitters don't control locos properly. I guess that I will need to get rid of the two I have been using for 15 years or so and find something "more appropriate". I have believed that they worked pretty well all this time but what do I know anyway?
Hmmm, since I am on social security, I imagine that I will have to keep things as is and have fun running my antique trains with my caveman equipment.
Now, is anyone willing to front me the money to buy the latest toys?

Troublesome Outlaw Woodie



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 Posted: Thu May 11th, 2017 01:52 pm
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Helmut
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Woodie -
I just described my experiences with a few brands of car transmitters that I bought during the last five years. A particular one is shown on the photo. It came as a bargain package w/receiver. It has two channels, the receiver has three.
The speed trigger gave very bad resolution and was not symmetric, although it is a full proportional channel. So I decided to have something more familiar with a decent rotary knob.
I removed the original centering spring and the mechanical travel limits, and the trigger. That channel I used for function by installing a resistive ladder and pushbuttons, giving four different function values in my case. How it works is a  different story and may be told later.
Most commercially available on/off switch PPM decoders work with just the maximum/minimum setting of the channel PPM signal. Depending on duration and /or repetition rate of the signal, one or more on/off outputs can be switched.
The other channel is used for speed+direction setting, easily done by a DPDT switch, two resistors, and the pot. The signal it generates is understood by almost all available reversible speed controllers. The principle may also be topic of a thread later.



@Si
That's all, I keep my mouth shut  in your thread now. Show us your shoehorning.

Last edited on Thu May 11th, 2017 02:04 pm by Helmut



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 Posted: Thu May 11th, 2017 03:35 pm
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Michael M
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Helmut,

I'm about as dumb as dirt when it comes to R/C, so I generally sit back and listen to those in the know and try to learn a thing or two.  My first attempt at installing a Coke can R/C car into a loco was a failure (I think I fried the board), but on my second attempt I did mange to shoehorn a 1:18 scale R/C car components into a 1:35 scale 4-wheel critter.  I was just thrilled to death that it worked!  What I really like about using R/C car components (or tanks) is that everything I need is there.  All I have to do is pull everything apart and shove it into a loco shell (I'm very good at taking things apart...putting things back together not so well).


Woodie and Si,

Just keep the information coming please.  The more I learn the braver I get. 


I did pick up one of those voltage step-up boards.  This thing is VERY small!  But it was only a couple of dollars, and I couldn't resist.



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 Posted: Thu May 11th, 2017 08:41 pm
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W C Greene
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Helmut, I failed to mention that my old "Capt. Kirk" space pistol transmitters were made by KYOSHO, at the time a top name in the rtr r/c car market. The boards which I still have in the lokies are also KYOSHO Mini T parts. This old stuff has served me well, I am glad that I could afford the stuff back when I had a job and not be tied to being an old man waiting for the "check in the mail" from the government. It's all cool.
Have fun and run a (r/c) train today!

Woodie



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 Posted: Sat May 13th, 2017 04:33 pm
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Si.
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" That's all, I keep my mouth shut  in your thread now. Show us your shoehorning."



Hi Helmut :wave:



Sorry Helmut, you can't jump-ship just as it is springin' a leak ! ;)

We need your expertise on hand, in case there is trouble pluggin' the hole !! :brill:



Your GX2 mods. look very interesting.

A 're-badged' FlySky, by the looks of things.

I did see that they seem to be available in both monochrome & orangey placky.



One of the reasons I bought the £0.99p transmitter was ...

... I knew I wouldn't end up in tears, if my HACKSAWING of the main-board went pear-shaped ! :shocked:

I am probably known for more crazy plans than this ...

... so it probably won't surprise much, that I had considered re-casing it, in a spare Tri-ang P-42 ! :Crazy:

You just can't get quality phenolic-resin enclosures like these in the 21st Century. :f:







The 2-channel FlySky, GX2, or whatever they are floggin' it as these days, looks pretty simple.

Although it does have all the extra 'trim' jazz & switches/buttons under the flip-up hood at the back.

Still, better than the ones with L.C.D screens, which I have totally avoided ...

... I can do without 'watching tele' while I'm playing trains. :P



Helmut, you should do that Thread on modding your transmitter, it looks very interesting.

I may start another Thread if I mod. my £0.99p one, as I am going to keep this Thread as simple as possible.



I am actually still on the lookout for some 27MHz A.M. gear, as it happens.

For some unknown reason, it seems quite scarce on eBay.

What does come up, is always complex, high-cost & 'collectable' even, vintage stuff.


I nearly bid on 2 'Hi-Tech' 27MHz A.M. receivers the other day.

In the end, they sold for a lot more dough than the £3.84p FlySky though. :f:

Oh well, first things first, I have some Gigas that are gonna Herts me first ! ;)



:!:



Si.



Dave the postman delivered some more cheap crap I'd bought, this morning.

Including a pair of nice small & cheap DC-DC 9 Volt step-up regulators ...

... and THE WRONG E.S.C !  :f:  which aint nuttin' like the one in the eBay photo !


I guess you get what you pay for ! ... Or not, as in this case !! :f:  ;)


:moose:




____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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