Marcq Posted December 16, 2019 Posted December 16, 2019 For a throttle, I see people using one magnet, some use 2, even 4. What's the difference? Is more better? My plan was to use one, on the shaft of the throttle I'm building, with the sensor in front of it, using Arduino Pro Micro with MMjoy2 Thanks, Marc..
Marcq Posted December 17, 2019 Author Posted December 17, 2019 (edited) 131 views!! And no one can help me! Wrong forum? Would a picture help? Marc.. Edited December 17, 2019 by Marcq
Ranma13 Posted December 17, 2019 Posted December 17, 2019 It's unclear what you're asking. A hall sensor senses differences in magnetic fields in order to determine angular position. How many magnets used is dependent on the hall sensor; some only need 1, some need 4. There is no "best" just as there's no best number of tires for a vehicle; you could be riding a unicycle, bicycle, or car, all which need a different number of tires.
Goblin Posted December 17, 2019 Posted December 17, 2019 What Hall sensor are you using? I used Allegro A1302 sensors and diametrically polarized ring magnets. Worked great.
Sokol1_br Posted December 17, 2019 Posted December 17, 2019 "Best" magnet for contactless sensor is diametrically magnetized rings, as Goblin say. If ring is not available two opposite square magnets - e.g. in the "Bic" assembly, make a bit easy tune the magnet field relatively to sensor, as the magnet field will work like in diametrically magnetized ring. But for short angle movement just one square magnet wok OK, e.g for rudder pedal brake axis.
Marcq Posted December 17, 2019 Author Posted December 17, 2019 (edited) Thanks guys I really appreciate If I use the A1302 sensor and a ring magnet, how strong does the magnet need to be ? Like this one? https://www.kjmagnetics.com/proddetail.asp?prod=RX088 Here's my arrangement if that helps Marc.. Edited December 17, 2019 by Marcq
Goblin Posted December 17, 2019 Posted December 17, 2019 You need diametrically magnetized (polarized) magnets. The ones in your link are axially magnetized. These are the ones I used. https://www.supermagnete.de/eng/ring-magnets-neodymium/ring-magnet-10mm-5mm-5mm_R-10-05-05-DN You put the hall sensor inside the hole and let the magnet turn with the axis.
Marcq Posted December 17, 2019 Author Posted December 17, 2019 You need diametrically magnetized (polarized) magnets. The ones in your link are axially magnetized. These are the ones I used. https://www.supermagnete.de/eng/ring-magnets-neodymium/ring-magnet-10mm-5mm-5mm_R-10-05-05-DN You put the hall sensor inside the hole and let the magnet turn with the axis. Perfect Thanks, Marc
Goblin Posted December 18, 2019 Posted December 18, 2019 Come to think of it, I still have leftover hall sensors and magnets, from my build. If you only need a couple I could send them to you...
Marcq Posted December 18, 2019 Author Posted December 18, 2019 Come to think of it, I still have leftover hall sensors and magnets, from my build. If you only need a couple I could send them to you... Thanks bro, I already ordered the magnet and sensor , next time Marc..
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