Opinion: walk-around throttles with/without "memory"

[mmagliaro]

While Peteski's caution is a valid one, there may be ways around it, like putting some sort of intermediate driver after the decoder before it goes to the track.

But to Ed's point, the *real* reason I would not do this is because I want to build it all myself, because that's where all the fun is. But you know, that's just how I am.

[Chris333]

I remember a walkaround throttle with memory in MR long ago. It used push buttons and there were plans on how to build it.

Sorry can't find it, but I do remember wanting to build it (never did).

Edit: this might be it (because I see push buttons)
data:image/png;base64,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

[peteski]

Dude, what the heck did you post?! 

Is that Uuencoded PNG image  maybe?

[C855B]

I remember a walkaround throttle with memory in MR long ago. It used push buttons and there were plans on how to build it.

Sorry can't find it, but I do remember wanting to build it (never did).

Edit: this might be it (because I see push buttons)
data:image/png;base64,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

Ah! Found it! I see push buttons, too! And I see dead people.

 

[Chris333]

LOL not even sure that is it. Sorry it was probably back around 1988ish in MR.

I remember each push button had it's own resistor and I think it knew what button you pressed based on what voltage went thru the wire to the base.

[mmagliaro]

That's some sort of encoded image, and believe it or not, if you paste that whole thing as a link into a browser, it will display.  But the image is so small I can't really see it.

Different voltages selecting different functions...  What a clever, old-school idea.
I can definitely see how it would cut down on the wire count to the hand-held unit, though.  I think if I were going to do something like that, I'd put a little oscillator in the hand-held, with different capacitors in it wired to different pushbuttons, so that each button put a different frequency AC on the line, and then at the throttle, "decode" that with simple filters...In fact, they make an IC that can do this, the LM 567.  A few external components can tune it so that when it sees a certain frequency on its input, it turns on an output line - a frequency-controlled switch.

In my case, I already have the actual circuitry for the throttle working and I am super happy with how it works.  And no, it doesn't use PWM, because I want the throttle to be versatile enough to run encoder-equipped engines without freaking out the decoder.

[mmagliaro]

Chris,
Even better!  You can buy a whole DTMF encoder (and a decoder) on a little board module for a few dollars from ebay or aliexpress.  Essentially, you'd send touch-tone phone tones through the walk-around wire and each tone received at the decoder can switch a different relay on/off.  Then you can control anything you want, speed, direction, etc.   You could probably buy some of the RF transmitter/receiver modules that are also everywhere on the internet these days and send the tones wirelessly.
LOL.  Wireless DC throttle control DIY.

[Chris333]

OK since I started all this and I hate remembering old memories, but being foggy on the details. 

The previous link I gave is wrong

Here it is. Jan 1986 MR (1988 could have been about the time I wanted to build it) I just know it was before I had a drivers license. And at the time my parents had a VCR with a tethered "push button" remote. Yes that remote got torn apart with the quickness 




Was I even remotely close on how it works?

And in a twist the reason I hate DCC so much is because I want a knob 

[mmagliaro]

In answer to your question, Chris, no, from looking at the schematic, the voltage on the wire doesn't control which function happens.  It looks to me like the accelerate/brake (speed up/down) controls just charge or bleed off the large C1 capacitor,
and the voltage on that cap is what controls the speed by controlling the voltage at the input base to transistor Q1.
As such, it also looks to me like this thing wouldn't have very steady speed.  Once you set the speed by pressing a button and C1 charges up, it seems to me that it will slowly discharge as the train runs and the train will slow down.  He used 4 transistors, I suspect, in an effort to have Q1 pass as little base current as possible, so that C1 holds its voltage for as long as possible, but it still has to gradually bleed down over time.  It may take a long time, but even if it took 20 minutes for you to notice that the train has slowed considerably, that's pretty clumsy.
When you read through the rest of the article, does he mention anything about it only holding speed for so many minutes before you need to press the accelerate button again?

[Lucas in Alaska]

Thai site has a 3A memory walk around throttle.

http://www3.sympatico.ca/kstapleton3/Index.html

[peteski]

And in a twist the reason I hate DCC so much is because I want a knob 

There are plenty of DCC handheld throttles which have knobs for speed adjustments.  Granted some are endlessly spinning encoders, but some of them use old fashioned potentiometers like the ones used in DC throttles.

[mmagliaro]

There are plenty of DCC handheld throttles which have knobs for speed adjustments.  Granted some are endlessly spinning encoders, but some of them use old fashioned potentiometers like the ones used in DC throttles.

Interesting you say this, because I have just been working on a way to use a rotary encoder in a wireless RF walk-around that would then drive a digital pot at the other end, allowing wireless remote control of a conventional DC throttle circuit that uses a pot for the speed control.  I am not even going to attempt using a potentiometer for this purpose, as interfacing that to some sort of digital converter and then to the RF transmitter would be a heck of a lot of work. 

[peteski]

Interesting you say this, because I have just been working on a way to use a rotary encoder in a wireless RF walk-around that would then drive a digital pot at the other end, allowing wireless remote control of a conventional DC throttle circuit that uses a pot for the speed control.  I am not even going to attempt using a potentiometer for this purpose, as interfacing that to some sort of digital converter and then to the RF transmitter would be a heck of a lot of work.

I find that humorous.  Like Chris, I prefer knobs for speed contol, but I intensely dislike the encoder type knobs.  I like the knob to have a minimum and maximum limits within a single revolution of the knob, with positive stops at both limits. Like a typical single-turn pot.  With rotary encoders (like the ones on Digitrax throttles) you have to spin multiple revolutions to go from zero to full speed.  The only indication of speed you have is the digital speed step display.

This gets specially annoying when a radio throttle drops packets and you need to stop the train fast. You frantically turn the known counter clockwise and the train is not stopping!!  I would definitely avoid that type of interface on anything I would build.

As far as interfacing a analog pot to a computer, most (if not every) microcontroller out there (or boards like Arduino) usually have multiple analog input channels available.  All you need to do is connect the pot's ends to ground and Vcc, then the wiper contact to one of those inputs.  The A/D converter is built-into the microcontroller, and there are routines available which will read the converter and provide a digital value.

[mmagliaro]

I agree, Peteski, I do not like rotary encoders for a speed control.
After exploring all manner of frequency/voltage conversion transmitter/receiver schemes, I'm afraid it does look like
the most straightforward way is to put a little Arduino board at each end.  The Tx side reads the pot, generates a proportional digital code, which goes into one of the cheaply available RF transmitter modules you can get these days.  On the other end,
a matching RF receiver sends the received code to another Arduino which outputs a voltage proportional to the code.
So effectively, you have a remote-controlled wireless pot.
I was hoping not to have to take this all the way to microcontrollers, but it looks like that is the best way to do it.