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the AH180 has a Tperiod of 150ms. That gives me 8Hz only. So i think with more magnets this wont work. I tried this with one magnet and got max 240rpm measured. This is 4Hz. So: The sensor is not capable to switch fast enough. And with only 1 magnet rpm wont be reported for ages.
If I try to insert magnets as SNSNSN - with alternating poles facing the sensor, will that cause faster switching?
Are there any other hall effect sensors that have a quicker switching time? I was pointed to a "Quadrature hall effect sensor" any idea how to implement that?
It turns out ... these sensors are much more expensive here in Australia than in US. So I went for these: [...]The data sheet show that rise and fall time is 2microsec as compared to 1microsec for the other one. Hope these work.
This seller does not post to Australia.
Item location: SZ, ChinaPosting to: United States, Europe, Canada, Australia, MexicoExcludes: Alaska/Hawaii, US Protectorates, APO/FPO, Africa, Asia, Central America and Caribbean, Europe, Middle East, North America, Oceania, Southeast Asia, South America
The sprockets are plastic. I tried to insert the magnets at 45 degrees, but in hurry, one or two got a bit off. Being plastic, i had to use the magnets for the hall sensor to work. I will look at IR as well.
Problem solved..... turns our the wires were not copper.....after using proper copper wires it all works great. The sensors are very responsive and was able to measure upto 1000 rpm easily and as slow as 4 rpms.
AND I changed to wires to copper at the same time ....
yes ... breadboard tinned jumper cables
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Mechanics and Construction