Laura
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Comments
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When we use limit method to reduce sampling rate on Sensor Fusion from 100Hz to 50Hz is the down-sampling performed on client or the sensor? Downsampling is performed on the sensor (in firmware). Please send more info about your setup.
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You can simply use our software reset functionality in the APIs and our MetaBase App if you want. That way you don't have to do a physical reset. Let me know if that works for you.
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We don't support pairing and you cannot connect to the sensor via the Menu on your phone. The only way to connect to our sensor is via the MetaBase App ( or if you write your own App). If you think it's a bug or issue, please follow the steps: h…
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In the MetaBase App, you can only group a sensor once (one sensor cannot belong to more than one group). There is no way to get around this with our Apps unless you write your own App using our APIs.
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Yes you can do that.
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We do not have a formula for "x,y,z". You will have to do this yourself. There are some great white papers on this subject online. Another question: when I change the range of accelerometer(e.g. 4f, 20f, 200f) by using the above method, the ou…
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I am not sure if we have an example for Java, you will need to look around our documentation. The principle is the same.
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Hey Illius, Can you share mag data from three sensors (one from your defective unit) to see the difference between them. Now please note that MMR+ do come with a warning notice that the vibration motor has a magnet that may severely alter the …
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The coordinate system, the resolution, and the units could be different. Some sensors use milliGs, some use Gs. The XY,Z orientation could be different. And so on. This is definitely comparing apples and oranges so be careful in your analysis.…
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https://github.com/mbientlab/MetaWear-SDK-Cpp/blob/d679878b8f7f88471697491f352469c391c7f27f/cppdocs/source/accelerometer.rst You can see an example here: https://github.com/mbientlab/MetaWear-SDK-Cpp/blob/d679878b8f7f88471697491f352469c391c7f27f/…
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https://mbientlab.com/tutorials/Windows.html -> 2017
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IQ?
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Yes, other people on the forum have commented everything works on the Pi4. I can only think that your setup is somehow compromised.
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You should wait a few seconds for the action to be over before you call it again.
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What I meant was that the motor should just turn on once. You shouldn't be calling libmetawear.mbl_mw_haptic_start_motor non stop. That's not the intended use of the motor
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Is the function implementation of the read_gatt_char function important for connect? Yes, we read the device information when we connect. Does the example code you uploaded work under the firmware 1.5.0 version? If I need to downgrade …
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You need to read our developer documentation: www.mbientlab.com/developers and our examples: https://github.com/mbientlab/MetaWear-SDK-Python/blob/master/examples/log_acc.py
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Since this was not the intended way to use our sensor; it is difficult to comment appropriately.
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why are you calling this more than once: libmetawear.mbl_mw_haptic_start_motor
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An occasional reset might do the trick.
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Remember sensor fusion comes out at 100Hz and there's a max of about 120Hz or so in a BLE link. You would have to downsample the acc.
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you can only log one sensor fusion output. quaternion OR linear acc
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BLE5 has been written about quite a lot already so I think it is best to point you to Nordic's blog on this: https://www.nordicsemi.com/Products/Low-power-short-range-wireless/Bluetooth-5
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Python bluetooth libraries are notoriously unreliable so you have to implement reconnects and graceful error handling if you are going to use python. In our experience, we have much better reliability with javascript (noble).
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Thanks sanjeev
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Thanks for the update.
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In streaming mode, if you disconnect, you lose data.
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Again, you can use the MetaBase windows app or just make your own with our APIs.
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This is entirely correct. Unfortunately BluetoothLE is slow so if you max out the memory it will take 15 minutes to download.
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Yes you can stream but you cannot graph on the smartphone MetaBase App (ios and android) If you want to graph live data you have to do it on the Linux or Windows metabase App. Linux and Windows have enough screenspace and processing power to g…