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'DelTang' 2.4 GHz Receivers
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 Posted: Mon Oct 22nd, 2012 05:49 pm
   
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DavidT
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Yes, small world.

It can be done. I'd expect to need a 'ramp speed' setting which would be easiest if set using a spare channel. This would be separate from the primary motor control channel. Does this sound appropriate?

We'd also have to decide whether this feature lives in the Rx or Tx. A DX18 Tx can probably do this now but at a very high price. It may also be feasible to build it into an experimental product such as my Tx2.

BEMF-based ESCs will be more effective than plain PWM in converting the commands to smooth movement. However, I think this is the same whether we are talking about manual or automated ramp up and down.
dt.

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 Posted: Mon Oct 22nd, 2012 11:13 pm
   
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mwiz64
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I would be very surprised if the DX18 could do that. The closest you could come to that are the ESCs used to fly helicopters where they run in what's called governor mode. They spool up the heli rotor in stages. Particularly, the larger helis cant just leap up to speed without breaking something. Now you can flip a switch on the TX to tell the esc to go up from idle to the next throttle setting but its the esc that handles the smooth transition.

That said, if you can work the programming, I believe Turnigy has a 9 channel TX that has open source coding that people have been modifying to suit their needs. Don't know if a throttle ramp up is possible, however.

Mike

Last edited on Mon Oct 22nd, 2012 11:14 pm by mwiz64



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 Posted: Tue Oct 23rd, 2012 05:22 pm
   
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Bernd
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I'm a bit excited. I went to a LHS and purchased a Tx today.

Here's a few self explanatory pictures.

All the elctronics laid out and labeled.



 The Transmitter




All of it together.



Next, hook it all together and figure out how it all works and is set up.

David, I may need your help on this.

Bernd

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 Posted: Tue Oct 23rd, 2012 05:42 pm
   
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DavidT
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Looking great. I love the cable system. Feel free to ask.
dt.

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 Posted: Sat Oct 27th, 2012 10:34 pm
   
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Bernd
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Frankin-crane Lives. :rah: :rah: :rah: :rah::shocked:

http://www.youtube.com/watch?v=jEltlyGHz0A&feature=plcp

I'll fill in the details on my crane thread soon.

Bernd

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 Posted: Sat Oct 27th, 2012 11:24 pm
   
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Ray Dunakin
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Too cool!



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 Posted: Sun Oct 28th, 2012 12:05 am
   
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W C Greene
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What Ray wrote! Way, way cool.

Woodie



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 Posted: Sun Oct 28th, 2012 08:08 am
   
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DavidT
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Outstanding Bernd. It's great seeing it doing something useful. I like the way you have mounted and deliver power to the Rx.

I would find it more intuitive with the swivel on the left/right stick and the speed a bit slower. If you want to experiment with less responsiveness you can press in the right Tx stick once powered up. The led on the Tx should flash and you will have invoked 'low rates' on the Tx.

I think low rates reduces the speed of all motors. To 'permanently' reduce the speed of 1 motor such as the swivel, you can put diodes in the wires to the motor. Each diode such as a IN4148 will drop about 0.6v. You need at least two, in parallel with opposite polarities, to preserve two-direction control.
Regards, David.

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 Posted: Sun Oct 28th, 2012 11:49 am
   
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Bernd
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David,

I had trouble getting it to work. I just hooked the mototrs to the Rx and hoped for the best. I still don't quite understand how the binding is done. As I said it just happened to work. On the back of the Tx is instructions for binding. It also said that it would not be nesscary since it was already done at the factory. So I was a bit confused.

Can I change the stick functions around on the Rx/Tx somehow or do I need to unsolder the motors leads and change them around?

As far as speed is concerned I really don't want to add more electronics to the Rx. Being able to adjust speed by the amount of stick movement is good enough. I'll give your suggestion a try on pushing the stick down on the Tx. I knew that the left stick does that sine that is part of the binding instructions on the back of the Tx.

I am looking at doing 3 more cranes like this. I've learned a lot on this project and hope to make improvements on the next three cranes.

When I had heard railroad modelers talk about battery power and R/C control I was very skepitcal. I thought to myslef, "learn how to wire a layout guys". But now that I've actually built a R/C battery powered HO scale model I'm sold.

I need to let some of this soak into the brain and also need to play with it somemore. My biggest fear was when soldering the wires to the Rx that I get a solder bridge or heat the board to much, but my many years of doing circuit board soldering saw me through with flying colors.

So David I plan on getting at least three more Rx's from you in the future. Now I need to finish the crane up and start my next project, a mechanical indexing turntable. Oh yeh, I also need to do some work on my HOn30 limestone quarry layout.

Bernd

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 Posted: Sun Oct 28th, 2012 12:29 pm
   
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DavidT
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Bernd,
Your Tx is normally sold with a plane. So the reference to already being bound is in that context. Since you have my Rx43d working, you should not need to rebind that again.

Rx100-T that I sent you should be used to build up some confidence with RC. It would be worth getting a cheap servo if you don't have one. The servo and the 3 green leds on the bottom of Rx100 will give you things to experiment with. I can explain more when you are ready.

To bind Rx100 (and any other DSM2 Rx), the Rx needs to be in bind mode before the Tx (with my Rx's, switch on and wait 20s). If the left Tx stick is being pressed when the Tx is switched on, the Tx will then execute the bind. The orange/red leds on both with flash if happy and then go solid when done.


When space is not critical I fit small sockets (S1.27) to the Rx. This allows you to swop and reverse motors very easily. I can also supply it with wires now.

For now, the easiest and lowest risk will be to cut the wires and rejoin them, but see below too.

The outputs can also be re-assigned electronically. This is easy once you get your mind around it but it is not intuitive. To consider this you should first experiment with 'programming' the Rx100-T once you have that working normally.
Regards, David

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