Setting a proper Throttle hold on a Taranis

[Two-Six]

Hi,
I have just pretty much finished my Trex 450L DOMINATOR Heli and I need some guidance on how to set up a proper throttle hold with my Taranis for it..

Here is the scoop, the ESC needs to see zero on the throttle channel in order to arm on boot-up.  I can also make sure its in "normal mode" so that low stick it at zero and it will arm.

However it will spin up if I accidentally nudge the throttle stick or switch into idle up.   Obviously this could be BAAAAD!

Also this ESC need to be set up so that you can switch on throttle hold or more accurately the auto rotation motor cut switch so it drops the throttle signal to about 32%. 

This stops the motor but because the ESC doesn';t see ZERO, so when you go "Oh Shizer" and screw up your auto-rotation you can un-hold it and the motor will spin up fast. 

If it sees zero with a traditional throttle cut then it will spin up using its soft-start profile...By the time the head is up to speed again it will be buried in the ground....

Throttle hold or the auto-rotation switch is not really a hold/motor disable setting as its sending 32% to the ESC..It works but its not a proper lock.

I can make a switch do this that over-rides anything on the throttle channel but because I am very likely to switch of the motor in flight using the overriding throttle cut switch.  I want to program my Taranis to be able to apply a proper zero value over-riding throttle cut signal for arming and safety but I want to make it hard to apply by accident.

So I was thinking it would be good if I have to move two switches together or hold one in for say 5 secs, or put that switch there and that one there, or turn a POT all the way left for zero-/lock/arming and then past the centre detent to the right before it will unlock.

I need to do something that';s hard to do by accident so it will not trigger the zero/motor-cut/hold/arm signal to the throttle channel by accident....Basically make it idiot proof

Any pointers at to how I should go about programming my TX to do this?

Thank you

[bazzerh]

you could use the SH sprung switch and using the EDGE logic parameters so that if its held for more than x seconds then another logic switch will trigger your throttle cut

read this about logic switches.

http://open-txu.org/home/continuing-education/logical-switch-functions/

[Two-Six]

I have managed to do a ESC';s disarm thing on my naze.  I did it by setting up about 7 logical switches that all make the Naze arm (or output +100) for various positions of two of the 3pos switches. 

BUT if I hold both of the switches DOWN then it outputs -100 and disarms the Naze.

Being totally crap at maths...How many possible combinations of switch positions can you get with two 3 position switches anyway???  Two to the power of Three or something??  What ever THAT means :-) 

Is that TWELVTY?

I think I can do this with my heli too, so that I would have to positively switch down two switches to make the motor cut out/make it safe/send zero throttle to the ESC.

I have autorotate throttle hold set up on the 2 pos left switch which drops the throttle signal to about 32%, just above the point where the governor will disarm but you can cut the motor.

However if you screw up your autorotation the head speed will recover fast if throttle hold is toggled off.  This is the autorotation bail out feature of the Castle ESC.

Below this point (about 30%) the ESC will use its slow-spool up speed which is really slow and the heli will be in dirt before the head speed picks up again..

I still haven';t programmed this into the TX for the heli yet but I think its going to work as intended.  It seems like the right solution to me but it might not be....Somebody who knows more that I do about it might well do it differently.

[Fletch]

http://www.rcgroups.com/forums/showpost.php?p=26049923&postcount=1550

I don';t know if you have this sorted yet, but here is a set-up I developed to use as Throttle Cut or Electric Throttle Safety.

For throttle cut you can use a momentary switch, but for Electrics I recomend the use of two or three position switch. The switches, on first operation will set and hold trottle full low. It requires a second operation of the switch to release the throttle.

Setting throttle cut on I/C engines and safety throttle for Electrics

Setting up switches:-
Go to Menu page "CUSTOM FUNCTIONS"   "CF1" should be highlighted, I used this, but you can scroll down if you wish to use a differerence one.
Short press ENT button, to select it.  the highlight will move across to first column. Short press ENT and highlighter will flash. Use the + / - keys to scroll though switches. Use "SH down arrow" for throttle cut and "SFdown arrow"(or any other positional switch ) for Electric Throttle Safety.
LONG Press ENT and a "t" should appear after the switch designation so, if using SHdown, it wil look like you are finding a way around the rude word filter .
Short press ENT and highlight will stop flashing.
Press "-" to move highlight to 2nd column.
Short press ENT, highlight will flash, use + / - buttons to  move to " SafetyCH3".
Short press ENT,  press "-" to move to next column and short press ENT.
Use " + / -"  to move to " -100 " and short press ENT.
Press "-" to move to square box.
A short press on ENT will place a "check" mark in box.
Now EXIT back to front page. Short press  PAGE button 3 times to go to CHANNEL MONITOR  and check everything works as required.