I would like to sample the acceleration of the wheel axis (vertically and left-right) N times per rotation (for example once per spoke, but not necessarily). The data would be processed with Arduino.
I have no ABS system in my car.
I can mount the accelerometer easily, but I don't know how to synchronise the sampling with the rotation of the wheel.
Which sensor could be easily mounted on lightweight wheels (no steel wheels) and work reliably in such dirty and vibrating environment?
My current option is only a Hall sensor on the brake caliper, together with a strong magnet fixed in each spoke of the alu wheel, to get about 6 readings per wheel rotation.
Still, I'm not sure the Hall sensor would be close enough to the magnet, and I'm not sure a rare-earth magnet would survive the vibrations of the wheel.
Any other options? I'm thinking also to place the N magnets in the wheel axis itself, as long as it is feasible. Still, is the Hall the best choice?
Of course, if you think that the magnets in the rims is a good solution and that it can withstand the stress, you can support that option. Additional solutions are fine, but not necessarily required.