#4375212 - 08/18/17 05:06 PM
Cougar hall sensor issues
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Joined: Aug 2017
Posts: 6
Povlhp
Junior Member
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Junior Member
Joined: Aug 2017
Posts: 6
Aarhus, Denmark
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Found my old HOTAS cougar - serial <1500. Throttle pot dead so got some 49E Hall Sensors. Testing with 5V power source the do fine. Connecting it to the cougar throttle connector it does not work. I have 0.7V only between Vin and GND. 4V with no 49E. With and without signal/Vout connected. Any explanation ?
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#4375217 - 08/18/17 05:42 PM
Re: Cougar hall sensor issues
[Re: Povlhp]
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Joined: Aug 2017
Posts: 6
Povlhp
Junior Member
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Junior Member
Joined: Aug 2017
Posts: 6
Aarhus, Denmark
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Well,looking around it seems like there is a 6.7k resistor towards 5V ? See https://pit.uriba.org/uriba/standalone-cougar-tqs-part-i/If this is the case, the 1.1k resistance of the 49E would cause a voltage drop of about 1.1/(1.1+6.7) * 5V = 0.7V over the 49E. This is exactly what I am seeing. But the actual voltage is only around 4V without the load. That matches better with 5V and a 1N4001 (1V voltage drop). Any help ? Next step must be to test with just a 1k resistor. Do I get the same voltage drop over it ? If so, I have to "steal" 5V elsewhere for the throttle hall. Any insight welcome.
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#4375235 - 08/18/17 07:38 PM
Re: Cougar hall sensor issues
[Re: Povlhp]
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Joined: Nov 2001
Posts: 3,955
Sokol1
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Senior Member
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Internet
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#4375360 - 08/19/17 04:07 PM
Re: Cougar hall sensor issues
[Re: Povlhp]
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Joined: Aug 2017
Posts: 6
Povlhp
Junior Member
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Junior Member
Joined: Aug 2017
Posts: 6
Aarhus, Denmark
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Works ok but not perfect. HOTAS Control Panel gives me a range of around 300 values with my setup. That is 2xmagnets side by side on an adapter in handle, and sensor fixed below the center axis. So when I turn north or south will get very close to the hall sensor. Considers making some 3D printed assembly for it to ensure minimal distance and more locked down relative position. But works for now.
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#4375600 - 08/21/17 11:08 AM
Re: Cougar hall sensor issues
[Re: Povlhp]
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Joined: Aug 2017
Posts: 6
Povlhp
Junior Member
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Junior Member
Joined: Aug 2017
Posts: 6
Aarhus, Denmark
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Yes, the ring magnet is a possibility, but more hard to come by.
The design I will play a bit more with is: having the sensor on one wall A magnet composed of 2 flat magnets reversed (giving one long magnet with south to one side, north to another). This magnet will be turned around a center point below the hall sensor, such that when turned 90 degrees north is up, south is down and the other way around. Adjusting center could be done by turning it a few degrees if needed. A grub screw could be used to lock the magnets-holding-thingie to the axle.
But for most uses, center is calibrated independently, and so is endpoints, so if is off by a bit it is not important. What matters is that I have plenty of resolution to each side.
The good expensive hall sensors has a sensitibility 2-2.5x better than the cheap. And since signal degrades with square of distance, you can do with 1.5x the distance with a good sensor compared to a cheap. If we talk 2 vs 3mm, both are easily obtainable with a 3D printer, operating in 0.1mm layers. The glue to hold the components will be thick enough to influence it as well. For now I have plenty of 4x4x1 mm magnets, and they re pretty good for this. Stack 2-3 to improve magnetic field, and all is good.
Will build a test-setup some day with an Arduino, and a display. Easier that juggling with the probes of a multimeter, and I have the parts. Time as a more rare resource.
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