9X (and possibly 9XR/PRO) Switch Board Design

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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa »

By the way, as you can see on the picture, the latest switch board I built is smaller and it allows a bigger / taller speaker to be installed..

JoãoImage

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andrewju
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by andrewju »

Yeah, that's nice! That's exactly why I made these slots on my board:

Image

If someone doesn't use a stock beeper, he can easily cut (or just break) the unused part of the switch board and free up some space for a larger speaker. I do have a couple of speakers that didn't fit otherwise.

The only thing I miss on your design is a 6-pin socket for the stock harness.
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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa »

andrewju wrote: Thu Jun 01, 2017 12:43 pm

The only thing I miss on your design is a 6-pin socket for the stock harness.
I am not really bothered about this because I can get 6 pin plugs from ebay and just solder the wires. Then I just secure them with a bit of hot glue. Not pretty but functional, and allows me to use big / Better mosfets..
If you are using the AO3407A be careful with the charging current.. Certainly not more than 500mA. That applies to the radio as well.

The IRF7416 allows for a higher current, and it is easier to place on a single sided board :) Not that making double sided boards bothers me anyway.. Actually my double sided come out better than the single sided, go figure why :o maybe the board quality itself, I don't know..
I did set a charge limit of 800mA before the Mosfet starts getting too hot to the touch. And this is a 7A Mosfet according to the datasheet.

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andrewju
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by andrewju »

I think there should be enough space to put a stock connector at the bottom of the board - similarly to how I did it on mine. This way it will be both, nice and functional! :)

Regarding mosfets, that's why I left the positive and negative poles on the switch. I know, I know, I'm the one who said it's probably not a good idea to do it this way. And in order to check myself, I use the switch board with both positive and negative battery poles connected to the switch itself. Time proves it works good and I didn't see any issues with the switch so far. Well, at least in my use case.
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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa »

Hmm, It might work, but when you warned me for the fact I had both, it did click that it wasn't a very good idea, and I would like to keep to it. In fact I am very happy to keep positive and ground as far from each other as I can :)

On another subject, I have been thinking about combining 2 of my projects together and design another safe switch board ;)
How would you like a single push button to turn the radio ON / OFF? :) :D
Would have to keep pressing for 3 or 5 seconds to turn the radio ON or OFF. If there is a bad connection on the battery, radio would be ON when reconnecting..
Charge would only be available if radio was OFF.. This would involve me messing with an ATtiny chip, Messing with something I don't really understand, which is the code :), and most certainly a double sided board.
also, how to install a push button replacing the power switch in a way that looks nice and it doesn't get pressed by mistake??
Questions, questions.. :) I bet I'm getting myself into trouble again by asking this :) :mrgreen:

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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by andrewju »

The FrSky Q X7 has a push button. You push it quickly, and the radio powers up. You push and hold it for a few seconds, and the radio powers down. On the X7 it is integrated into the main MCU. So that when the radio is ON and you push the power button, there are dots appearing on the screen, one by one. After the 4th (or the 5th?) dot, the radio powers down. This visualizes the process and makes it quite convenient.

There's also an LED built into the on/off button. It's green when the radio is ON, and it turns red when there's some alert displayed on the screen. Also a nice feature, in my opinion.

I'd say these features have to be implemented directly on ARUni (or on a similar board), with corresponding support in software. Then it will be convenient.

Still, it's going to depend on the enclosure specifics. Turnigy 9x enclosure is designed for a slide switch, and modifying that part may be tricky. Though, if we add a spring that will return the slide switch to the bottom as soon as it's released, it will behave as a button. Hmm... this may be interesting! Hmm... :)
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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

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Forget the on screen stuff :) that is more work for Mike and the free pins on the boards are better used for extra switches and pots in my opinion.. For the 9x this has to be done standalone just like the safe power switch, or the RF Power Switch module I built for my radios :)
We could make LEDs light in sequence, but that would mean a bigger chip, not a small ATtiny..

João

EDIT: And then there is another problem. Current draining when OFF. I would like to know what is the OFF current of the QX7.
To be implemented on the board itself, it would need other regulators in my opinion. And again, on the board it would use valuable pins that we might want to use for Better stuff. Look, the QX7 has less switches and pots than the other taranis.. :) That is when I love my 9x radios :)


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andrewju
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by andrewju »

In my opinion, replacing a slide switch with a push button doesn't make much difference. The real advantage the new board may have is the RF Power Switch on-board. Though, it's only useful to those having an internal RF module installed.

P.S. I don't have a Q X7 now... Next time I get my hands on it, I'll measure the current with the radio switched off (I hope I won't forget!).
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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa »

The push button thing is not something really needed, and it doesn't improve safety at all :)
It is just more fun, if it made reliable :)

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Re: 9X (and possibly 9XR/PRO) Switch Board Design (current drain on battery)

Post by bob195558 »

Current Draining battery when OFF,
interestingly the Aloft-2500 mAh -AA-7.2V battery which cost $11.50,
(http://alofthobbies.com/frsky-taranis-2 ... grade.html)
in my Taranis-x9d radio went flat after being left plugged in over several (winter) months.
Normally I am building and doing mods through the winter months, but this year I did not have the time.

So my Taranis-x9d must have some current drain from the battery when the radio power is OFF ? :?:

So if I know I will not be able to use my Taranis-x9d for several months, I should then unplug the battery.

Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa »

Some NiMh and NiCad batteries have a high self discharge rate, so that would be perfectly normal

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