T flip-flop switch with Trn

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This feature could be useful for security switch on throttle channel, and match 
perfectly with Trn switch (because it is monostable):
- radio on, TrnT (Trn T flip-flop) default value = 1
- one click on Trn => value TrnT = 0 => security disabled
- one more click on Trn => value TrnT = 1 => security activated

So, each time you turn on the radio, you are sure that throttle channel is OFF, 
whatever the position of switches.

TrnT (and its inverse !TrnT, with 0 as default value) could be also used as a 
mixer input or mixer switchf for example for activating LEDs for night flight 
with !TrnT : LEDs off when turning on radio, on when clicking one time Trn, off 
with a second click.

Original issue reported on code.google.com by f.ague...@wanadoo.fr on 31 Aug 2012 at 7:45

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I agree the TRN switch as a flip-flop could be useful, thought of that some 
time ago already... however I'd never use it for a safety switch.
If you set for example the THR switch as safety switch it's easy to see and 
confirm it's ON and active, it's pure hardware. With a flip-flop type switch 
you never directly know which state it's in, you have to go look at the screen 
on some place that's not always visible...

Original comment by bernet.a...@gmail.com on 31 Aug 2012 at 9:26

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The state is given by the model itself : for my examples, no throttle response 
or LEDs OFF is an tangible indication of what is happening.

For the throttle security, the advantage of T flip-flop is that you don't have 
to check  the switch when turning on the radio, security is always enabled as 
long as the button is not clicked. When done, you are now in normal use and so 
don't have to check again in whitch state the T flip-flp is.

Original comment by f.ague...@wanadoo.fr on 1 Sep 2012 at 8:43

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Yeah well, I usually activate/deactivate my throttle safety switch several 
times between the time I turn the radio on and off... My concern is that after 
toggling it a few times it's too easy to think you have it active, when it 
actually isn't. With the "hard" switch, when it's ON it's ON. 

Original comment by bernet.a...@gmail.com on 1 Sep 2012 at 8:56

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This thread leads me to think about using throttle trim as a multilevel switch, 
with default state 0 when the tx switched on, so it can be used as an automated 
throttle safety function. In the other states 1-5 it could be used as a FPx 
switch. Trim also does have its place on the LCD,where its state could be 
indicated.

Original comment by mho...@gmail.com on 2 Sep 2012 at 1:17

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I've kind of done the throttle trim as multilevel switch on my hexa to control 
camera zoom (8 speeds each side) by using a custom curve. A dedicated solution 
would of course be nicer as in my case I can obviously still go further with 
the trim than what's useful. 

Original comment by bernet.a...@gmail.com on 2 Sep 2012 at 7:07

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Using throttle trim as safety switch, instead of Trn, is an excellent idea ;-)

Original comment by f.ague...@wanadoo.fr on 2 Sep 2012 at 9:11

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You can already use ThrT as switch using some custom/function switches.

Original comment by romolo.m...@gmail.com on 6 Sep 2012 at 7:27

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Done.

Original comment by bson...@gmail.com on 26 Feb 2013 at 4:09

• Changed state: Fixed