renev
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Linear acceleration is calculated by transforming raw acceleration from sensor frame to a global frame using an estimated sensor orientation, and then subtracting gravity. This means that it is vulnerable to calibration errors in accelerometer, gyro…
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I should have waited just a little before sending the question above. I now have the answer: return temperatureSensor.addRouteAsync { source -> source.stream { data, _ -> Log.d(SENSOR_LOG, "temperature data ${data.va…
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I ran into this issue as well. It seems that for whatever reason the Float::class.java type is cast into a primitive float type (so not Float with a capital F) on the Java side in the mbientlab API. I've tried quite a few things but have not been ab…
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It is possible to integrate linear acceleration (= acceleration minus gravity) to obtain velocity and position. Due to various errors this works for 1-2 seconds, after which the accumulated error blows up. Zero-velocity update (ZUPT) algorithms expl…
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Tommy, did you set the correct MW_MAC_ADDRESS?
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All I ask for is allowing data from multiple sensors to be packed, rather than just from a single sensor. It really would solve a host of bandwidth and synchronization problems. I don't see why you consider that a 'useless' comment.
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gilhalell is right: the Metabase app allows simultaneous sampling of gyr+acc at 100Hz. I suspect a rate of 50Hz is used, probably packing 2 samples for acc and gyr each. Adding magnetometer data would probably be a stretch, though.
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0.3s in 5min = 0.1% clock drift. @Laura: would that be within specs (it may be)?
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I would like to point out that the main problem is NOT BLE bandwidth. I have some experience with a comparable product (Moticon Insole3), which happily logs 3D acc, 3D gyro, timestamp, temperature, and 16 channels of pressure data, at 100 Hz. Oh, an…
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Hi Laura, Thank you for your kind offer. I desperately need a Java example for Android, though. Especially an example of setting up the data routes for the combination of accelerometer and gyroscope would be really, really helpful for the applicat…
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@Laura said: Hi John, It is explained in our tutorials, please go through them carefully. I have the same question and I spent a lot of time going through the tutorials, all sample applications that I could find, forum questions and wh…