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About RW199
since
03-21-2024
03-21-2024
RW199
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03-21-2024
07:35 PM
@FAE_CA1 "It always takes time from positive peak to negative peak or vise versa, because there is a 0dps point when turning back" - true, like in the image shown for y-axis data; peak to peak with a 0 dps in the middle. If I was to do an error analysis regarding this, what spec of BMI270/reason would you say makes this plot unattainable for a 0.05 s duration. EDIT: Just wanted to ask about the effects of poor RSSI, was hovering around 80dbm as sensor is placed within a solid skull and maybe 1-2m from connected phone. Could this affect data, accuracy etc.? Thanks.
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03-21-2024
06:20 PM
Thanks for your reply @FAE_CA1 , I tried this out and achieved a sine-like graph with peaks at +/- 2000 dps as you described... However, it seemed consistent that everytime I repeated this, it took ~ 0.2 seconds for the angular velocity to go from positive peak to negative peak (reading @ 800Hz). Again, quoting I need the unit capable of reading peak to peak within 0.05 seconds, and as I'm unfamiliar with specs of these units, is there any other parameter which could affect how quickly it can read from peak to peak? Of course I understand in my test, I may not have been rotating the unit fast enough but just seemed coincidental to me how similar the peak to peak times were.
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03-21-2024
03:54 PM
Hi, I have purchsed an inertial measurment unit from MbientLab which incorporates the BMI270. I am using this sensor unit placed within a concussion model to detect the angular velocities reached during a concussive whiplash motion. I am using the maximum range quoted of 2000 degrees per second, which the model comfortably reaches during the first movement (+2,000dps) of the head forward. The issue is, in the reverse movement of the head backwards, the angular velocity only goes to zero / slightly negative, when I expect it to reach close to -2,000dps (shown in Image attached, blue line is data from sensor, red line is the plot I would expect if working properly). Is this due to the BMI270 only being able to measure -2,000 dps starting from the positive 2,000 dps peak? (Positive peak to negative peak occurs in 0.05 seconds). Or, should the BMI270 be capable of detecting the +2,000 peak quickly followed by the -2,000 peak, suggesting something else in my experiment design is at fault for these faulty results? Thanks, Robert
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