Again a very interesting video exploring the depths of powered up! I don't think your sensor is defective, looking at the Lego Education Blog where they detail all the different sensors, they list the force sensor as having an resolution of 0.1N but with an accuracy of +/- 0.65N and activation force between 2.5 and 10N. It makes sense the sensor returns pretty much garbage below the activation cutoff, and it also makes sense this sensor isn't really accurate since it's designed for school use, you'd rather have a less-accurate sensor that kids can throw around and still work, that one that is a bit more precise but breaks when looked at with ill intent. With the same numbers coming up, internally the sensor submits its reading as an uint8 (unsigned 8-bit integer), so there's only 256 different values (0-255) it can return, so it would make sense that the "force" values are just a multiplication of that 0-255 range to map it to "real world" units.
Where did you find this blog post about the activation force? It's one thing if that's a thing, but it's ridiculous if it's not listed on the product page; I'd even call that scummy.
@@NonsenseWars Try searching for Exploring SPIKE Prime Sensors This is the 3rd time I've tried replying, if it gets removed again by youtube I give up.
I think at 5:37 you really hit on the problem of quantisation - the way the analogue quantity is converted to digital ‘steps’, and the completely-misleading number of significant figures that results! As you say, not enough resolution in the A/D conversion - but I guess that big ‘cliff’ must have a mechanical cause, such as rising spring rate. I wondered if a spring inside was becoming coil-bound but you’d think that would happen at max deflection; not starting deflection On another note, can you guys do a review of original Mindstorms NXT in your usual excellent style? :D with a follow-on video of aftermarket sensors? I really enjoyed the RCX stuff you did
I always like their deliberate style. You might think of it as stuttery, but I find it aligns with the speed of my thought process :D The annunciation is also clear for those of us used to other accents
Again a very interesting video exploring the depths of powered up!
I don't think your sensor is defective, looking at the Lego Education Blog where they detail all the different sensors, they list the force sensor as having an resolution of 0.1N but with an accuracy of +/- 0.65N and activation force between 2.5 and 10N.
It makes sense the sensor returns pretty much garbage below the activation cutoff, and it also makes sense this sensor isn't really accurate since it's designed for school use, you'd rather have a less-accurate sensor that kids can throw around and still work, that one that is a bit more precise but breaks when looked at with ill intent.
With the same numbers coming up, internally the sensor submits its reading as an uint8 (unsigned 8-bit integer), so there's only 256 different values (0-255) it can return, so it would make sense that the "force" values are just a multiplication of that 0-255 range to map it to "real world" units.
Where did you find this blog post about the activation force? It's one thing if that's a thing, but it's ridiculous if it's not listed on the product page; I'd even call that scummy.
@@NonsenseWars Try searching for Exploring SPIKE Prime Sensors
This is the 3rd time I've tried replying, if it gets removed again by youtube I give up.
Eh?! It only returns 8-bit values?!
I think at 5:37 you really hit on the problem of quantisation - the way the analogue quantity is converted to digital ‘steps’, and the completely-misleading number of significant figures that results! As you say, not enough resolution in the A/D conversion - but I guess that big ‘cliff’ must have a mechanical cause, such as rising spring rate. I wondered if a spring inside was becoming coil-bound but you’d think that would happen at max deflection; not starting deflection
On another note, can you guys do a review of original Mindstorms NXT in your usual excellent style? :D with a follow-on video of aftermarket sensors? I really enjoyed the RCX stuff you did
NXT is actually on the list now that it's basically old enough to be a vintage set lol
Fun video. Recommendation: try presenting the info a couple of times. The delivery is quite stuttery.
I always like their deliberate style. You might think of it as stuttery, but I find it aligns with the speed of my thought process :D The annunciation is also clear for those of us used to other accents
You're new here aren't you!?😂
would you consider selling your force sensor since you are unhappy with it?
Hmm, if we don't find a use for it, that's certainly a consideration. Might be a while before we take a look at it again, though.