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Radio Control Goes STEAMPUNK ! - Part II
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 Posted: Mon Apr 1st, 2013 12:39 am
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Toeffelholm
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Hi,

I have two of Davids small Tx2 2,4Ghz transmitter modules, which enable you to design your own small one hand control. Either for Davids tiny combined Rx/esc boards or for ordinary Spektrum DSM2 receivers as well.



(figure 1:24)

So beside my bigger transmitter that is made from an Dx5e, I wanted to build a second smaller one.






First I needed a case and, as some may know my design preference, I looked for something special. The case in the picture I bought years before on a christmas market, just because I liked it, but I never used it since then. It may be originally thought for snuff tobacco.

I got a 10kOhm pot with center-click from David, that he uses for his Tx21/Tx23 and purchased a nice poti-knob from the electric-guitar parts need. I want to install 3 switches, one for on/off, one for loco selection and maybe one for light. I had a few in the Rc-parts chest.







For connecting the pot to the Tx2 I used a common Servo plug with wires. The red and brown +/- wires are soldered to the outer connections, the orange "signal" wire to the middle pickup of the pot.

The Plug has 3 jacks, that would fit to the 3 pins of the Tx2. But the middle wire of the plug may not be connected to the supply voltage of the Tx that is to be given to the Tx's middle pin row. The voltage of the analog input devices need to be 1,55V. There is a reference voltage ( Vref=3.1V), that can be picked up at solder pads on the Rx. With an additional resistor of 10kOhm, serially connected to the pot, I get a voltage divider that provides the half reference voltage of 1.55V between the outer connections of the pot.







For the supply voltage I use a 9V battery for now. For connection to the Tx serves a 2-pole plug, that can be found as "BEC-connector" and that matches the pin-distance of the Tx2.

As the switch for binding is rarely used and the case is easy to open, I decided to install a micro slide switch inside the case. Binding is activated when the upper pin 5 is connected to 0V at the lower pin row. I used the "bind plug", that comes with the Tx2, for building the bind switch.







I placed these first parts into the case for testing and it works fine. I will change the 9V battery to a single LiFePo or Li-Ion roundcell to make place for the other switches. Also the status LED has still to be build in.







My antenna solution for now is just a piece of isolated wire going through the case. I think I will add a piece of brass coloured plastic tube there.



To be continued

Juergen

Last edited on Mon Apr 1st, 2013 09:51 am by Toeffelholm



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modelling in 1:22.5 on 32mm and 16.5mm track
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 Posted: Mon Apr 1st, 2013 09:50 am
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DavidT
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Very nice. Sticking out is fine but you could also wrap the aerial round the outside of the case (flat against the brass).
Regards, David.

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 Posted: Mon Apr 1st, 2013 11:36 am
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Giles
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Love it!



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Giles

The Loop. 0-16.5
http://www.youtube.com/watch?v=1FB2lTF4t4M&feature=plcp&context=C3775db8UDOEgsToPDskI_j5g3O_927OWTefW3AUU-
The End of The Line
http://www.youtube.com/watch?v=8SEo2v9v82Q
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 Posted: Mon Apr 1st, 2013 07:26 pm
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Toeffelholm
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Thank you David and Giles.

David, yes that's a good Idea, thank you.

Juergen



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 Posted: Mon Apr 1st, 2013 10:26 pm
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Bernd
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Juergen,

For some reason the pictures are not loading into the forum over here. At least I can't see them.

Bernd

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 Posted: Tue Apr 2nd, 2013 12:27 am
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bobquincy
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I love it!  I wonder if a miniature knife switch exists, kind of like those used in Young Frankenstein?  That would add a real steampunk look to the switch!



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 Posted: Tue Apr 2nd, 2013 03:39 pm
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Herb Kephart
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And a small tazer--so that you could have sparks going up a "Jacobs ladder".


Herb



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 Posted: Tue Apr 2nd, 2013 10:31 pm
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Toeffelholm
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Hi,

Do others also have problems seeing the pictures?

@Bernd, the pictures are stored on a German server, on a " .de " domain.

Any restrictions in your system?

Juergen



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 Posted: Wed Apr 3rd, 2013 12:20 am
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Bernd
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I tried just going to the domain and I couldn't see the pictures there either. It's looking like I'm the only one that can't see them. In any of the other sections I have no problems. The other thing I noticed was that "spell checker" isn't working either.

Running Windows 7 Proffesional and Explorer 9. I seem to be OK on other forums though.

Could be something on my computer changed from the last update. I hate when that happens. I'll have to check things out.

Do you have any other pictures else were on this forum I can try?

Funny part is I can go to your web site and see everything. Just having trouble see those pictures you osted here. Interesting.

Bernd



Last edited on Wed Apr 3rd, 2013 12:28 am by Bernd

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 Posted: Sun Apr 7th, 2013 10:47 pm
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Toeffelholm
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bobquincy wrote:
I wonder if a miniature knife switch exists, kind of like those used in Young Frankenstein?  That would add a real steampunk look to the switch!


Bob, thank you for mentioning this. I searched for this kind of switch longer before but didn't know the right term.


Juergen



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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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