#4436439 - 08/30/18 02:25 PM
Re: User friendly Hall Effect Rotary Sensors
[Re: Manchot]
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Joined: Nov 2001
Posts: 3,955
Sokol1
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Internet
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The fixed 2,48 reading suggest that magnetic field is not detected/processed. Maybe for this sensor you need diametrically magnetized magnet. The sensor you get is programmed for use analog output or PWM output? "The ICs offered here are unprogrammed and not lured. The blocks can only be programmed with the Melexis Programmer PTC-04 with Daughterboard HALL06 or be taught-in to the magnet design." This MLX90371 is a new model, probable not used yet in DIY, I know that (few) people have been use with success MLX90333 - that came programmed for analog output. Similar version is used in digital output in Warthog, T.16000M, X-55/56 - what require digital inputs in USB controller. BTW - Although cost more an really "friendly to use HALL sensor" - because have all is need: sensor, magnet, operating axis pole, assembly point in one package: is Bi-Tech 6127, that have versions with limited "electric angle" (30, 50, 90....) - desired in joystick use, and not only 360º version. https://www.digikey.com/product-detail/en/tt-electronics-bi/6127V1A60L.5/987-1391-ND/2620660
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#4436978 - 09/03/18 02:49 PM
Re: User friendly Hall Effect Rotary Sensors
[Re: Sokol1]
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Joined: Aug 2018
Posts: 5
Manchot
Junior Member
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Johannesburg
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Hi Sokol, Thank you for the reply, sorry I am only responding now, for some reason I am not receiving notification of new contributions to the thread. The fixed 2,48 reading suggest that magnetic field is not detected/processed. - Agreed Maybe for this sensor you need diametrically magnetized magnet. - That may very well be, thanks for pointing that out. While possibly not optimal using a round 9mm by3mmT rare earth magnet, I would however still expect some variation in the reading if the sensor is working. The sensor you get is programmed for use analog output or PWM output? - It comes standard as analog output but can be programmed for PWM The ICs offered here are unprogrammed and not lured. The blocks can only be programmed with the Melexis Programmer PTC-04 with Daughterboard HALL06 or be taught-in to the magnet design. This MLX90371 is a new model, probable not used yet in DIY, I know that (few) people have been use with success MLX90333 - that came programmed for analog output. Similar version is used in digital output in Warthog, T.16000M, X-55/56 - what require digital inputs in USB controller. - That is good to know that I am not the only one battling with this! BTW - Although cost more an really "friendly to use HALL sensor" - because have all is need: sensor, magnet, operating axis pole, assembly point in one package: is Bi-Tech 6127, that have versions with limited "electric angle" (30, 50, 90....) - desired in joystick use, and not only 360º version. - I suspect that this may be the way I need to go.... Here is another that may or may not work out of the box, not sure.. https://www.digikey.com/product-det...0-00-02-A/1294-55200-00-02-A-CHP/5401501 Many thanks for the very informative response Sokol!
Last edited by Manchot; 09/03/18 02:53 PM.
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#4437027 - 09/03/18 07:26 PM
Re: User friendly Hall Effect Rotary Sensors
[Re: Sokol1]
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Joined: Aug 2018
Posts: 5
Manchot
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Thank you Sokol. I need to find something that will be reasonably easy to implement for non-technical people. So while I may be able to follow this and set it up for myself, providing it as a common solution for the Heritage Flight Simulation Mk.IX Spitfire may be problematical. I will keep working at it and gladly accept all advice. I am waiting for feedback on the Melexis from Digi-Key and hope they will be able to provide some clarity on how the MLX90371GVS-BCC-100-SP-ND is supposed to be implemented... Was there any discussion on the forums about the other Melexis unit? Your point on working angle is well made. Easiest in my case is to have a few printed gears as necessary to give the full resolution.
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#4437312 - 09/05/18 12:41 PM
Re: User friendly Hall Effect Rotary Sensors
[Re: Manchot]
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Joined: Aug 2018
Posts: 5
Manchot
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Well my question has been answered. After failing to get an answer from Digi-Key (Melexis had I requested that I contact them as one of their distributors), I went back to Melexis and put it strongly that users were being let down through lack of information. This was the response from their technical staff: We regret to hear you were disappointed in the service provided by our partner and are currently checking why they were unable to assist.
In the meantime our Melexis engineers have had a look at your query and below you can find their feedback :
Hello,
The output mode is indeed set to analog by default, as stated on section "11. End-User Programmable Items" of the datasheet (see "AOUT_MODE_NORMAL" parameter). In the same section, you'll see that "CLAMPLOW" and "CLAMPHIGH" are by default set to 50 %VDD. This means the output will remain equal to 50 %VDD regardless of what the sensor is measuring. Therefore, in order to start using the sensor, you should at least program "CLAMPLOW" and "CLAMPHIGH" to different values (10 and 90 %VDD, for example).
After changing these parameters, the output of the sensor will vary linearly with the measured field, between CLAMPLOW and CLAMPHIGH.
P.S.: In order to program the sensor, you will need a PTC04 programmer and a DB-HALL06 daughter board.
I hope this helps.
Kind regards, I have responded as follows so it will be interesting to see whether Melexis will actually come to the party and make these units availble in a usable format: Thank you for that information from your engineers. Regarding that information herewith my observations: I find that not clearly stating in the datasheet (that the units are not usable without programming), ignorant at best, deceitful at worst. There can be no excuse as to why these units are not supplied in a usable state, i.e. to have the ClampHigh and ClampLow values set at generally optimal levels, with the option for further refinement through programming should the user wish. Selling these units with a setup that renders them useless therefore forces the user to purchase the programming units. The quote I have on these from Digi-Key are as follows: PTC04ND: US$1141 PTC04DB: US$260 DB-HALL06: US$296 So whichever way you look at it, a user is in for a cost of US$556 or $1,437 Is it the intent to make these units exclusive to industrial use, ignoring the potential market for makers and hobbyists and other smaller users? Simply by shipping the Dimm4 Analog units with optimal clamping values, this market can easily be tapped. In the meantime, I feel a little done in by having 12 of these units which are unusable. Furthermore, I have spent significant time incorporating the units into my designs for our simulator. Designs which will now have to be redone to incorporate more conventional solutions, as I cannot expect purchasers of my product to all have programming boards before they can use it. Kind regards,
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#4437324 - 09/05/18 02:01 PM
Re: User friendly Hall Effect Rotary Sensors
[Re: Manchot]
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Joined: Aug 2018
Posts: 5
Manchot
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Johannesburg
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So I will be following your advice Sokol and doing a redesign using the Bi-Tech 6127 for all critical axis, being the roll, elevator, yaw and throttle. The others will incorporate cheaper potentiometers. Damn, also just dawned on me that your link to the German site indicated you must have a programmer!
Last edited by Manchot; 09/05/18 02:07 PM.
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