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#3288516 - 05/06/11 04:10 PM Re: DIY hall sensor ... [Re: f15sim]  
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Sokol1 Offline
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Tirta,

I think that you dont need shield, X and Y axis is not too close, and dont have another ferrous metal part around inside stick.

Anyway, since you disassemble a defective CD/DVD-ROM drive (to get magnets) these things have a small DC motors, disassemble one - leave metal case and internal ferrite magnet - and use around your HALL assemble. Sample:



Clarification to CH purists: Tirta no making any sacrilege putting HALL in your Fighterstick.
Are a old gameport model "USBbified" with DIY Mjoy16 controller. wink

BTW - Cost to replace 2 CH pots ~ 20 U$ + 10 U$ postage (last time I buy. And in my case + country fees, around 100%).

Cost of DIY 2 HALL + magnets assembly ~ 10 U$.

Sokol1

Inline advert (2nd and 3rd post)

#3288572 - 05/06/11 05:17 PM Re: DIY hall sensor ... [Re: Sokol1]  
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tirta Offline
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Hi Sokol1,

thanks for the reply.

Quote:
metal case and internal ferrite magnet

is that the circular one?
is this for shielding?

so I still need the 2 little magnet blocks near the laser for the hall sensor, right?

#3288848 - 05/06/11 11:17 PM Re: DIY hall sensor ... [Re: tirta]  
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Sokol1 Offline
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You still need the Neodymium magnets - these circular ferrite probable dont have necessary force to work with HALL. But make a test.
I suggest use just for shield - in fact only the case of motor (or a piece of tube of ferrous material) is suitable to shield. But start without this, probable find that is not necessary.

DIY HALL assembly is very flexible - you just need do some experimentation. Just dont mix + and - wires. smile

Sokol1

#3289078 - 05/07/11 08:34 AM Re: DIY hall sensor ... [Re: f15sim]  
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tirta Offline
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ok, Sokol1, thanks for all the replies.
I have learned a lot about from reading this thread and yours.
I will let you know the result. biggrin biggrin biggrin

#3290266 - 05/09/11 03:41 AM Re: DIY hall sensor ... [Re: f15sim]  
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f15sim Offline
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A few pics from the final version of my A1302 based hall effect pot replacement:







The first picture shows the control arm mounting plates that I made - they press-fit onto the pen body. They're VERY tight.

The second pic shows the completed assemblies with the control arms installed.

The third pic shows them installed in the Jentron MK2 gimbal. The original pots would jitter around center anywhere from 200 to 400 points. These hall effect replacements are rock solid. No jitter or spiking at ALL. They're stupidly easy to make too!

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3291681 - 05/10/11 09:37 PM Re: DIY hall sensor ... [Re: f15sim]  
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f15sim Offline
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Here's where you can get the bearing that I used in the project:

http://www.vxb.com/page/bearings/PROD/SB/Kit1063

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3306691 - 05/29/11 11:56 PM Re: DIY hall sensor ... [Re: f15sim]  
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Sokol1 Offline
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A different an interesting arrange for DIY HALL:

http://www.sukhoi.ru/forum/attachment.php?attachmentid=134869&d=1306067091

HDD magnets, that are use not only do excite HALL but to replace gimbal springs, the joystick is centered by magnet force. Gimbal made with HDD parts, include disc.

http://www.sukhoi.ru/forum/showthread.php?t=59583&p=1625474&viewfull=1#post1625474

Sokol1

#3318677 - 06/14/11 04:48 PM Re: DIY hall sensor ... [Re: f15sim]  
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tirta Offline
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Hi Guys,

I have finished converting my CH flightstick + pro throttle + pro pedal, all the major axis to hall sensor successfully.
I use Allegro 1302, since that is the only hall sensor I could find in my town.
The magnets are from used dvd/cd drive.
I must say the result is very good, the HOTAS feels very smooth, very stable, very accurate and no more spikes! biggrin

I would like to say thanks to you all for contributing to this thread especially to Gene for starting it and to Sokol1 for his special help.

Happy simming! biggrin biggrin biggrin

#3318679 - 06/14/11 04:55 PM Re: DIY hall sensor ... [Re: f15sim]  
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f15sim Offline
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Pics! Pics! smile

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3318864 - 06/14/11 08:59 PM Re: DIY hall sensor ... [Re: f15sim]  
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Falstar Offline
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Originally Posted By: Gene Buckle
Pics! Pics! smile

g.


+1 biggrin

#3328367 - 06/26/11 07:50 AM Re: DIY hall sensor ... [Re: f15sim]  
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tirta Offline
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Ok Guys, finally I manage to get some pictures here.
Sorry they are rather unclear, I do not have my camera so I use my psp cam.

so here is my CH HOTAS :

Sorry I miss the Pro Throttle, it is still under the table.
I have use this since the 90s, so now it is almost 20 years.

here is the inside part:

this is used to be a gameport joystick,
I have made it USB by using mjoy16, thanks to Sokol1. cheers

here is the hall sensor and the magnets:

I glued the magnet to a unused pots part, and put the sensor above the magnet.

The magnet is very near, but does not touch the sensor.



Sokol1, with A1302 there is no need for shielding the magnet, mine works just fine.

Gene is right, after you know what to do, hall sensor is very easy to make. copter

#3329368 - 06/27/11 01:53 PM Re: DIY hall sensor ... [Re: f15sim]  
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f15sim Offline
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Very nice! Congrats!

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#3330162 - 06/28/11 10:04 AM Re: DIY hall sensor ... [Re: f15sim]  
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Brandano Offline
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Caput Mundi (well, it used to ...
Yup, very clean setup, congratulations. What is the sensor used? The position of the sensing plate relative to the magnet seems a bit odd to me.

Last edited by Brandano; 06/28/11 10:04 AM.
#3330250 - 06/28/11 12:47 PM Re: DIY hall sensor ... [Re: f15sim]  
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tirta Offline
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thanks all for the kind words.
I use Allegro 1302.

I am sorry if the picture is not very clear,
the sensor position is based on this picture:

Thanks to Sokol1. thumbsup

#3330341 - 06/28/11 02:17 PM Re: DIY hall sensor ... [Re: f15sim]  
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Brandano Offline
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Caput Mundi (well, it used to ...
Ok, that's a bit odd because on the A1302 the sensing portion is parallel to the body of the package, and it should sense the flux lines going through it. I am going to try this arrangement on some of the sensors I have left to see if the sensitivity is the same.

#3330788 - 06/28/11 10:29 PM Re: DIY hall sensor ... [Re: Brandano]  
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wledzian Offline
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The 1302 does sense flux strength perpendicular to the package. Important to note in that graphic is that the magnet pivots along an axis below the sensor. When aligned as in the graphic, the flux lines will be parallel to the package face, and should produce a 2.5v output. When the magnet pivots to either side, the field lines will no longer be parallel to the face, and will produce an off-center output.

If the magnet were to pivot around an axis through the sensor, that arrangement [/i]would[i] fail.

#4106498 - 04/15/15 11:20 AM Re: DIY hall sensor ... [Re: f15sim]  
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tirta Offline
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Hi Guys,

I have just changed my hall sensor from A1302 to S495A

My joystick is CH Combatstick.
I have measured the angle movement:
for x axis, it is around 60 degrees from extreme left to right.
for y axis, it is bigger: around 70 degrees from extreme up to down.

using this setup:

with A1302, I can use it right away, no problem here.

However, with ss495a, now I find its max angle movement is too small for y axis,
I have not moved the stick to its extreme down position,
but the sensor value has already reached 0.
the same with max up position (around 4060).
the maximum angle movement for s495a is around 55-60 degrees.

Since my max angle movement for y axis is around 70 degrees,
what should I do to make the angle movement of the sensor bigger?
Please advise.

#4106598 - 04/15/15 01:40 PM Re: DIY hall sensor ... [Re: f15sim]  
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f15sim Offline
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Try moving the sensor so that the top is pointed at the magnets. You should get 90 degrees out of it easily.

g.


Proud owner of 80-0007
http://www.f15sim.com - The only one of its kind.
http://geneb.simpits.org - the Me-109F/X Project
#4107071 - 04/16/15 11:20 AM Re: DIY hall sensor ... [Re: f15sim]  
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tirta Offline
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Hi Gene,

Thanks for the reply.
I tried to set up the sensor so the top is pointed at the magnets.
However, now the sensor value can not reach 0 and 4060.
They are around 300 (min) and 3800 (max).

However, these values does not work well with mmjoy.
When I test it with joytester in joysetup.exe,
the values always changes, they can not be used optimally.

You can read about that more clearly here:
http://SimHQ.com/forum/ubbthreads.php/topics/4092126/Re:_MMJoy_-_Build_your_own_USB#Post4092126
http://SimHQ.com/forum/ubbthreads.php/topics/4093559/Re:_MMJoy_-_Build_your_own_USB#Post4093559

#4107608 - 04/17/15 09:25 AM Re: DIY hall sensor ... [Re: f15sim]  
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Brandano Offline
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Caput Mundi (well, it used to ...
You can't reach the full range of the ADC converter in the microcontroller with a Hall sensor, unless you use additional circuitry or have a way to set a different reference voltage on the ADC. Even in optimal situations a common hall sensor will swing the output voltage only between 0.5 and 4.5 volts (approximately) and this means that 20% of the full range of the converter won't be used. This is generally not a problem, since you would find it really hard to position a control with the accuracy of the remaining range, and indeed many joysticks only have 256 "steps" per axis. You just have to calibrate the controller to make use of the available range, something that the firmware can probably do automatically by assuming the controls to be centred when it is powered up, and extending the maximum and minimum value for each axis every time a new value exceeding the current one is reached.

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