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Simple R/C Car Controls made usable
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 Posted: Wed Jul 5th, 2017 04:41 pm
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Helmut
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@LeeB
EVERY RC system is capable of handling that IF you let the antenna peek out of the roof. You cannot overcome laws of physics and the Faraday's cage phenomenon. So what?



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 Posted: Thu Jul 6th, 2017 01:07 am
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Bob D
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Hey guys,Don't mean to be a snot, but please include the scales you're working in, I doubt this setup would move my 14lb O-scale 4-8-4 :moose:I'm sticking with the Deltang-based gear for now :old dude:



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 Posted: Thu Jul 6th, 2017 01:34 am
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Si.
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Hi Bob :wave:



The £3.84p 'FlySky' receiver & £2.54p 20-Amp E.S.C that I bought ...

... would EASILY be usable even for HUGE 'G'-scale locos !



I don't even think it would break a sweat on an 'O'-scale 4-8-4.



So for £6.38p inc. P&P + the battery of your choice ...

... you've got sensibly priced parts for an installation no problem.



:moose:



Si.



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 Posted: Thu Jul 6th, 2017 07:52 am
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Helmut
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Bob D wrote: I'm sticking with the Deltang-based gear for now :old dude:
Which I don't consider a dumb decision - I'm using it in my TT scale locos throughout.

@all
The reason why I wrote this article is to show what extra effort you have to put in to achieve a loco-like behaviour for in most cases, just one vehicle at a time. No opportunities for additional functions etc.
Hope that helps to avoid some pitfalls for those who first and almost only look at initial costs.



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 Posted: Thu Jul 6th, 2017 08:52 pm
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bobquincy
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This is an interesting thread to me since I dabble in PWM motor controls and microcontrollers. Educated in analog electronics in the 70's and 80's I understand what Helmut has drawn but having gotten lazy in the past decade I now buy things like Pololu's DRV8835 motor control boards that do all this for us. :)

One of the systems I work with is an infrared remote with FWD/REV (on/off). My recent modification is to use a PIC microcontroller to slowly (3 seconds) ramp up/down the speed with PWM instead of just on/off. The PIC is less than $1, the kind of price tag that Si likes! ;)

I make no pretense that this stuff is easy (it isn't easy for me either) but it is possible and works well. The low end systems are fun to play with as long as we don't expect too much and are willing to tinker with them.

I call it FUN! (I also call programming in assembly language fun, take that into consideration).  In the meantime I use Deltang for most of my RC projects.

Last edited on Fri Jul 7th, 2017 01:31 pm by bobquincy



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 Posted: Fri Jul 7th, 2017 01:10 am
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Si.
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" Educated in analog electronics in the 70's and 80's "



Hi Bob :wave:



Ah ! ... The good ol' days ... I remember them well !!



Those lovely ( relatively ) cheap 741 white-noise generator op-amps ...

... 'high-tech' leaky zinc-carbon batteries, the size & weight of boat-anchors ...

... bemoaning the passing of 'environment-friendly' vacuum-tubes ...

... the Z80 computer ...

... flares, 'taches, prog. rock triple LPs !



Marvelous stuff !! ;)



- - - - - - -



" less than $1, the kind of price tag that Si likes ! "



Come on Bob ...

... don't make me out to be THAT much of a cheap-skate !

I forked out a whopping-great £3.84p inc. P&P for my state of the art 2.4GHz receiver !!



" The low end systems are fun to play with as long as we don't expect to much "



Why settle for a 'low-end system' ?

When you can have a high-end system for virtually the SAME money ??



Have you heard the one about the Trabant, the Ford, and the Ferrari ? ;)



:moose:



Si.



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' 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: Sat Jul 8th, 2017 09:29 pm
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Helmut
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Si. wrote: " Have you heard the one about the Trabant, the Ford, and the Ferrari ? ;)

D'ya mean the one where when it came to a recently-ploughed field, all of them got stuck but the Trabant plowed right through ( I've done that with a Trabant, so please no argueing about that )?
Si, when you take the total cost, those cheap 2.4G systems allowing for binding ( i.e. multiple parallel operation ) have an advantage when you are willing to recycle all the components, motors and transmitter included.
Of course, when you want something a bit more sophisticated ( like me ), they are not the premier choice



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 Posted: Sun Jul 9th, 2017 07:37 am
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Michael M
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Can someone talk more about these microprocessors?  Just what kind are you looking for, and how do you install the thing?



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 Posted: Sun Jul 9th, 2017 06:16 pm
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bobquincy
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If you are asking about the microcontrollers, there are several types that are useful for our projects.  But first, what can these do for us?  Add speed and direction control to a simple on/off system; control or flash LEDs; detect magnets or lights (with suitable sensors); decode DCC or RC signals; BEMF; whatever we can think up...

Search for "model railroad arduino projects" and "model railroad pic projects", plenty of uses and articles.
http://pcrnmra.org/pcr/clinics/ModelRailroadingWithArduinoRdr7up.pdf
http://e2e.ti.com/blogs_/b/motordrivecontrol/archive/2013/10/25/easy-cruise-control-for-brushed-motors-using-bemf


The type I use the most are PIC by Microchip.  A PIC is only the microcontroller chip, no board or other components.  As a result these are inexpensive (about $1) and highly configurable but are also the most difficult to use as they require knowledge of electronics.  PICs are usually programmed in assembly or C using a development board, Microchip's Curiosity is about $20.
PICs can directly power LEDs but motor control requires an additional driver board like Pololu #2135 ($5).

Next are the Arduino types, much more user-friendly and ranging in price from about $6 - $12 (Adafruit Trinket, Arduino Pro Mini) and up.  There are also generic types for even less.  Arduinos include the microcontroller mounted on a board along with USB, I/O, voltage regulators, etc.
Programming can be done with a USB cable and open-source development software.  There are many libraries of Arduino code and plenty of online help so you may not have to develop much software on your own.  Most Arduinos also require a motor driver board although some (like Pololu's A* robot controllers) can directly drive motors.

Other microcontrollers include TI's MSP430 series and more (see Adafruit's "development board" category) but I have not used them and have little knowledge of them.

Last edited on Sun Jul 9th, 2017 06:17 pm by bobquincy



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 Posted: Mon Jul 10th, 2017 01:18 am
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Michael M
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Bob,

Thanks for the information but most of that went right over my head.  I'm just mastering putting RC into my locos.  The less wires the better for me.  When I worked for PacBell installing phones I zapped myself all the time.



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