Originally Posted by
kufman
Currently 4. I have experimented with 1, 2 and 4 pickups. The main problem with my pickup is that PLA doesn't block IR light so I have to cover the disk with electrical tape. I then cut out the holes in the disk with an X-acto knife and the edges aren't as clean as the 3d printed part.
Yes, sorry. Wrong velocity. The big wheel didn't really work any better anyway. No gear reduction but the data points are timed revolutions not a polling. Every 15msec, it records the next 1/4 revolution time and equates that to RPM. I have been playing around with 2 different ideas. The first being the improvement of the Simple Dyno sketch. The second is dumping the whole run to an array using the Minima (doesn't work with SD yet or my Win7 shop computer. Had to bring a Win10 computer down to the shop).
How big is your encoder wheel? I can print one in PETG, or even PA6-GF. Haven't had a chance to print with the PA6 yet, but it is supposed to be dimensionally stable.
Would you care to share your timing for the 15ms intervals and how you go about collecting the times? I'm curious if you are using only timers or if you are using any delays.