GANDTT

Re: GANDTT

Postby krokodil » Fri Jan 23, 2015 12:07 pm

image.jpg
Turntable painted

image.jpg
GDTT turntable



Almost done :grin:
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Re: GANDTT

Postby ConducTTor » Sat Jan 24, 2015 11:39 pm

It's gorgeous :) How do you plan on turning/controlling it?
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Re: GANDTT

Postby Rob M » Sun Jan 25, 2015 1:58 am

Beautiful work!
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Re: GANDTT

Postby krokodil » Sun Jan 25, 2015 3:23 am

ConducTTor wrote:It's gorgeous :) How do you plan on turning/controlling it?



The plan is to turn it by a geared stepper motor ( I have found some in my favorite electronic shop). Yesterday I just started to write a code for the control unit. It is not a big problem ( :boohoo: ) to control the motor ( I have already a starting electronics tu turn manually the bridge). The bigger challenge is to design the GUI - ie.the control panel or the way how to control the turntable I do not have many exits ( 2x4-5), so there are several options:
1. I can use a modern encoder - just a knob to turn and the bridge will follow
2. or I can place 2x4-5 small pushbuttons around circle on the control panel and the bridge will turn to the selected position.
3. or the very sophisticated universal solution would be to place 32 ( or practically any number, depends on the mechanical construction) illuminated switches around the circle, where the light will indicate the recent position while with the switch I can select the next required position. The lights in the swithes will follow the motion.

All 3 options have advantages and unfortunately also dissadvantages ( too many cables, complicated wiring or too complex electronics). I have to find a balance..... :grin:

I will see in the next days I will start to write a code.
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Re: GANDTT

Postby krokodil » Sun Jan 25, 2015 5:33 am

A question:

There are many control solutions for the turntables. Who has experience with any of them and what would you prefer as an optimal control solution? ( What should be on the control panel to operate the turntable?).
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Re: GANDTT

Postby MacG » Sun Jan 25, 2015 2:50 pm

I would prefer a manual control knob with two speeds, like the prototype. My second choice would a display with two digits and a encoder to choose the position. But this is more programing effort.
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Re: GANDTT

Postby CN-TT » Sun Jan 25, 2015 6:30 pm

She's a beauty! :thumbup:
I'd prefer solution #2 "place 2x4-5 small pushbuttons around circle on the control panel and the bridge will turn to the selected position."
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Re: GANDTT

Postby krokodil » Mon Jan 26, 2015 12:24 am

CN-TT wrote:She's a beauty! :thumbup:
I'd prefer solution #2 "place 2x4-5 small pushbuttons around circle on the control panel and the bridge will turn to the selected position."


That is fine if you have just several positions, like in my case up to 10 tracks ( positions). This kind of control is gettimg to be very complex when the number of positions is rising.
From operation point of view it is of course the best, what can be done. Just to place a pushbutton to the required position and it is defined. ( The problem is, that every pushbutton requires an extra input on the control device - up to 32 (48) - what is usually not available, or there is a need for a complex matrix readout of the pushbuttons and the corresponding wiring. I will see.)
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Re: GANDTT

Postby dileTTante » Tue Jan 27, 2015 12:52 am

Maybe this has useful ideas--
http://www.trainturntable.net/

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Re: GANDTT

Postby krokodil » Tue Jan 27, 2015 2:26 am

Thank you, very interesting approach.
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