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#3140922 - 11/20/10 01:19 AM uni-joint/hall sensor question  
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Bohemond Offline
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Bohemond  Offline
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Albuquerque, NM
I'm having issues getting my HE sensors to operate properly. I followed the basic plan of Julian's design. For some reason, I'm not getting consistent responses from the HE. Sometimes no movement shown and other times erratic movement running through BUO836X. The only idea I can come up with is perhaps the magnets are too close the the metal of the uni-joint which is causing interference with the magnetic field? If any of you stick building gurus have any ideas, I'd greatly appreciate any and all advice.

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#3140933 - 11/20/10 01:38 AM Re: uni-joint/hall sensor question [Re: Bohemond]  
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PropNut Offline
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Greenville, Michigan
Can you post a picture of your setup?


F/A-18C Hornet cockpit build project:

http://hornetpits.org/index.php?topic=15.0
#3140967 - 11/20/10 02:54 AM Re: uni-joint/hall sensor question [Re: PropNut]  
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Bohemond Offline
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I'll try to get some pics up tomorrow

#3141061 - 11/20/10 08:51 AM Re: uni-joint/hall sensor question [Re: Bohemond]  
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The first thing I would be checking would be the wiring connections, looking for poor connections or shorts. But pics would be great!

You can eliminate the stick's metal as the culprit by holding the magnet in one hand and the sensor in the other, and watching the output of the BU0836X as you rotate the magnet.

Also double check that your magnet is rotating about the correct axis.

#3141197 - 11/20/10 04:35 PM Re: uni-joint/hall sensor question [Re: Bohemond]  
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PropNut Offline
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This is hard to see but I glued mine to the end of a dowel just as the original version was but mine is a little longer to get the magnet away from any metal.



F/A-18C Hornet cockpit build project:

http://hornetpits.org/index.php?topic=15.0
#3141285 - 11/20/10 07:46 PM Re: uni-joint/hall sensor question [Re: Bohemond]  
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Bohemond Offline
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Albuquerque, NM
Thanx for the replies guys. Unfortunately my camera is on the fritz, so no pics. Looking at both Prop's and Julian's setups, mine is almost exactly the same. Magnets are closer to yoke. Probably 3-4mm away from the bearing cup. Testing the sensor and magnet dismounted still gives erratic readings ( btw, using Honeywell SS495A sensors ). Now, I'm thinking it's maybe a bad solder between the sensor and wires. Wierd thing is, when I first hooked an axis up, I got good readings. I'll make a new sensor mounting board and try that. Keep you posted. Thanx

#3141296 - 11/20/10 08:05 PM Re: uni-joint/hall sensor question [Re: Bohemond]  
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PropNut Offline
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I did get odd readings like that with mine at first also (I forgot about this until you mentioned checking your connections) I had the wires crossed when I soldered the first one up. I think it was VCC to leg 3 and VOUT to leg 1 or some such, the reading jumped all over. I wound up killing that sensor. Until I replaced it I was pulling my hair out (dont have much left to begin with). When I purchased mine (the allegro units) I got a baggy full for a couple of dollars on Ebay (I think it was) so replacing one was not problem.

By the way, I do not know what ujoint assembly you are using but mine is off an old Yamaha street bike. It is much smaller than a car ujoint assembly so I could fit it into a tighter box, etc. 20.00 on ebay did the trick.

Here is one for 10.00, notice the flange on the bottom to make it easier to mount to a flat surface. I removed the shaft itself and made my own so I could run the wires up through it and mount my top flange for spring center return.

http://cgi.ebay.com/ebaymotors/1980-Suzu...sQ5fAccessories

Last edited by PropNut; 11/20/10 08:09 PM.

F/A-18C Hornet cockpit build project:

http://hornetpits.org/index.php?topic=15.0
#3141380 - 11/20/10 11:28 PM Re: uni-joint/hall sensor question [Re: PropNut]  
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Bohemond Offline
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Albuquerque, NM

Prop,
I'm usins a bike uni also ( off a Honda I believe. Cost about $15 ) I bet I mixed up the wires. I guess I thought the only pin that was dedicated was the ground. Oops! Now I probably fried the sensor. Good thing I got spares. I'll have to try and find the correct wiring scheme. I'll give that a go when I get home from work in the am.
Thanks for the input.

#3141407 - 11/21/10 12:07 AM Re: uni-joint/hall sensor question [Re: Bohemond]  
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PropNut Offline
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PropNut  Offline
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Greenville, Michigan
Here you go:



F/A-18C Hornet cockpit build project:

http://hornetpits.org/index.php?topic=15.0
#3141421 - 11/21/10 12:34 AM Re: uni-joint/hall sensor question [Re: PropNut]  
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Bohemond Offline
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Great! Thanks for the diagram. If I'm reading it correctly, + is voltage in, - is ground, O is output ?

#3141422 - 11/21/10 12:36 AM Re: uni-joint/hall sensor question [Re: Bohemond]  
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PropNut Offline
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PropNut  Offline
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Greenville, Michigan
Yes, that is correct.


F/A-18C Hornet cockpit build project:

http://hornetpits.org/index.php?topic=15.0
#3141424 - 11/21/10 12:47 AM Re: uni-joint/hall sensor question [Re: PropNut]  
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Bohemond Offline
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Good deal. I really appreciate all the help. I'll hopefully get a couple of pics up when I get it sorted out. Thanks again Prop and Julian.

#3141606 - 11/21/10 02:06 PM Re: uni-joint/hall sensor question [Re: Bohemond]  
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Sokol1 Offline
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After you hook the HALL sensor in BU you go to Windows Control Panel, did the calibration process and hit APLY button? Sometimes response look weird, but after calibration all work OK.

Sokol1


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