New M9-R 45° throttle travel Hall Sensor Gimbal

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bob195558
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New M9-R 45° throttle travel Hall Sensor Gimbal

Post by bob195558 » Sun Aug 13, 2017 6:14 pm

New Frsky M9-R Hall Sensor Gimbal: (https://www.frsky-rc.com/frsky-hall-sen ... lots-m9-r/). (New M9 R Taranis Gimbals)

Update Sept 26, 2017: The real difference between the M9 and M9-R Gimbals is that the M9-R Gimbals restrict
the stick movement from 60 degrees to 45 degrees with less resolution.
See more info below (viewtopic.php?f=95&t=10431&p=130898#p132177).
And so by adding a curve you can do the same thing to your normal M9, see here: (viewtopic.php?f=95&t=10431&p=132191#p132191).

Description:
The Gimbals have a red metal body in place of the normal black: (https://www.banggood.com/Frsky-M9-R-Hig ... ewArrivals).
FrSky M9-R Gimbals are specially designed for FPV racing, 3D acrobatic with Fixed Wing, Quads and 3D Heli pilots.
M9-R Gimbals only have 45°of throttle travel
which will allow you to have a greater amount of throttle resolution giving you more precision control (less resolution).

M9 R High Sensitivity Hall Sensor Gimbals.jpg
New M9-R High Sensitivity Hall Sensor FrSky Gimbals
Cost is about $29.99 US

SPECIFICATION
Supply Voltage (VCC): DC 3.0 ~ ±0.5V (Add edit: or maybe "Supply Voltage (VCC): DC 3.0 ~ ±5V" (a max of 8V) see post #2 below.)
Sensitivity: 2.50 mV/G
Linear Output Voltage Range: 0.1 ~ (VCC +0.1) V
Quiescent Output (TA = 25°C, B = 0 G): 0.5 × VCC
Noise (no load): ≤40mVpp

FEATURES
only 45°throttle travel for quick throttle response
Hall sensor
4 ball-bearings
Adjustable tension
Ideal for FPV RACING, 3D and acrobatic fixed wing, 3D Heli
Last edited by bob195558 on Sat Nov 04, 2017 10:58 pm, edited 14 times in total.
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Re:New M9-R 45° throttle travel Hall Sensor Gimbals

Post by bob195558 » Sun Sep 03, 2017 5:41 pm

I did not see this until today.
The FrSky web page is listing "Supply Voltage (VCC): DC 3.0 ~ ±5V" (a max of 8V),
But other web places (like Banggood) are listing the voltage range to be "Supply Voltage (VCC): DC 3.0 ~ ±0.5V" (a max of 3.5V).
Not sure which is correct, but would guess ±0.5V would be the correct data.

The M-9 and M-7 FrSky Hall Sensor Gimbals are listing "Supply Voltage (VCC): DC 3.0 ~ ±0.5V" (a max of 3.5V).
The FrSky web page: (https://www.frsky-rc.com/product-category/accessories/).
The Banggood web page: (https://www.banggood.com/Frsky-M9-R-Hig ... ewArrivals).

Bob B.
Last edited by bob195558 on Wed Sep 27, 2017 12:59 pm, edited 2 times in total.
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Re: New M9-R High Sensitivity Hall Sensor Frsky Gimbals

Post by mpjf01 » Tue Sep 26, 2017 10:17 am

The M9-R gymbals are identical to the M9 except that the removable faceplate has different indentations that prevent the stick moving as far as it does in the M9. You can convert either one to the other by swapping the faceplates. Both are the normal Taranis standard 3.3V.

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Re:New M9-R 45° throttle travel Hall Sensor Gimbal

Post by bob195558 » Tue Sep 26, 2017 11:58 am

So by reducing the Stick movement, they are also reducing the resolution ? :?:

Could do this by adding a curve in the erSky9x firmware with the M9 Gimbals, no need for the M9-R Gimbals.

Bob B.
Last edited by bob195558 on Wed Sep 27, 2017 1:00 pm, edited 1 time in total.
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Re: New M9-R High Sensitivity Hall Sensor Frsky Gimbals

Post by jhsa » Tue Sep 26, 2017 12:52 pm

As far as I understand it is the physical movement of the stick that is reduced.

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Re:New M9-R 45° throttle travel Hall Sensor Gimbal

Post by bob195558 » Tue Sep 26, 2017 1:32 pm

Correct me if I am wrong, with the reduced physical stick movement,
when calibration is done with this reduced physical stick movement,
dose this remove a the total number of stick signals available (send) to be used,
so is this not reducing the total resolution ? :?:

Bob B.
Last edited by bob195558 on Wed Sep 27, 2017 1:01 pm, edited 1 time in total.
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Re: New M9-R High Sensitivity Hall Sensor Frsky Gimbals

Post by jhsa » Tue Sep 26, 2017 1:57 pm

If it is only the gimbal faceplate that is different, then yes, it might be reducing the resolution slightly depending on how much movement is restricted..

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Re:New M9-R 45° throttle travel Hall Sensor Gimbal

Post by bob195558 » Tue Sep 26, 2017 3:48 pm

I measure the M9 Gimbal from center stick (longitude throttle) position to its full travel, which looks to be 60 degrees, so the M9-R (red metal faceplate) is 15 degrees less travel or 1/4th less movement than the normal M9 Gimbals (total of 45 degrees stick travel with less resolution).
I think this would be 1/4th less resolution.
Where the M9 longitude stick movement, STOP is located, is at the back side (end) of the metal face-plate opening.
(I do not have a M9-R Gimbal to compare it with).

I was expecting (thinking) the M9-R gimbals would have a greater resolution not less.
I believe we can do the same thing in erSky9x by adding a curve like this:
M9 R Gimbal Curve.jpg
Using erSky9x Curve to make an M9 Gimbal to work like the M9-R Gimbal.
Bob B.
Last edited by bob195558 on Fri Oct 20, 2017 1:40 pm, edited 3 times in total.
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Re: New M9-R High Sensitivity Hall Sensor Frsky Gimbals

Post by jhsa » Tue Sep 26, 2017 5:19 pm

Bob, I think you are understanding this a bit differently than I do ;) :)
As far as I understand, for some reason it seems the gimbal's travel is being "Mechanically" restricted by the faceplate.
People that use them might want less movement of the gimbal itself (finger travel) and not less servo travel. They just don't want the stick to move as much as with other gimbals. The curve will do anything about that, as well as it will do anything about the resolution loss..
Imagine that with normal stick travel the voltage the hall sensor outputs is 0V when the stick is fully moved to one side, and 3.3V when the stick is fully moved to the other side.
If the faceplate limits its physical movement the voltage range will be less than before, say for example 0.8V to 2.5V (exaggerating here)..
After the calibration is made and the stick gives a value of -100% to 100% on the radio for the new voltage range, the result will be a little loss in resolution..

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Re: New M9-R 45° throttle travel Hall Sensor Gimbal

Post by bob195558 » Thu Nov 30, 2017 12:05 am

Do they really want/need a stop or shorter stick travel when a curve will do the same thing.
I do not think so. :)
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Re: New M9-R 45° throttle travel Hall Sensor Gimbal

Post by Daedalus66 » Thu Nov 30, 2017 12:14 am

A curve will not reduce mechanical travel, which is the desired result here.

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Re: New M9-R 45° throttle travel Hall Sensor Gimbal

Post by bob195558 » Thu Nov 30, 2017 10:44 am

Yes, but does give the same results, do you really need to hammer the stick home ?
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Re: New M9-R 45° throttle travel Hall Sensor Gimbal

Post by Kilrah » Thu Nov 30, 2017 11:12 am

With a curve you don't know when you've reached the max. Need a stop. Obviously people who need that do reach the endstops, they'd lose flying precision if they were pushing it past the point where the curve maxes out without being aware of it.

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