Laura
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Hey, Unfortunately, we don't provide any tutorials on this subject as there are already many great tutorials and examples on the web. It is up to you to interpret the data, our job is only to give you the data. Some amazing sources: * …
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* Is Javascript SDK better than Python using Warble? If so, Can I develop on windows machine? Javascript has a better and more reliable bluetooth library (unfortunately we do not write the ble libraries our API used (they are from 3rd parties) and …
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Are you able to replicate this and if so, how? Please send us the steps to replicate (code would be ideal) so we can solve this as a possible bug.
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The lag will be phone and conn settings (bluetooth setting) specific. You may be able to calibrate this lag out of your setup but we are not planning on doing anything for this (there are too many devices on the market and we don't have the manpow…
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Are you able to play with the connection settings and experiment? We do advertise quite slowly so this could be an issue.
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Unfortunately you are asking a general Python coding question, not a sensor or metamotion question so this is not the appropriate forum. Just do a few python dev tutorials online, get experience with Python scripting/coding, get more comfortable w…
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Why are you installing something that is already installed on the Metahub? It seems you are running our of stack/mem space on the install.
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Your board doesn't have that sensor on it. It has the BOSCH accelerometer on it (not the MMA). It is returning nul as appropriate.
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Ok. Can the receiving station get data in a wireless mode, after the logging stage? Yes, of course (you get your smartphone or hub to download from the sensor log memory using bluetooth).
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Hi @pingjapan, It depends, we have some folks that kill the battery in 6 hours and some in two weeks. You should experiment and figure out your device lifetime for your setup.
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can the sensor reach a sampling frequency of 200 Hz (raw gyro + raw acc)? In streaming-mode or logging-mode? Yes, in logging mode. Only 100Hz in streaming mode. we need the data form multiple MetaMotionRs to be in sync. Is data tagged …
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Please note it is your responsibility to learn Python. This is not a question related to our sensors but rather on how to use and code Python.
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You need to read up on how to code in Python. Once you are comfortable, you can modify this script by opening a file and writing the angles to that file.
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Unfortunately we don't own any of the BLE libraries but you are welcome to find the owner on github and make a pull or modification request.
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Is this something like a built-in default calibration value that isn't wiped by anything that the programmer can do with the SDK? Yes, it is done by our manufacturers/suppliers. Let's say that I set a different calibration with mbl_mw_…
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You would need to monitor the rssi outside of our APIs (code your own monitor). For example if you were developing an App using our Javascript APIs, they use the Noble BLE libraries under the hood. Noble has a .rssi monitor: https://github.com/mb…
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Can you update the firmware on the boards, make sure they are fully charged, and let us know if they work fine with the MetaBase Android app. After that is done, you can resume your Python tests and let us know how that goes (I think your Python is…
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just g
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There are three modes: * GpioPullMode.NONE == Floating (Tied to nothing, detached, no electricity can flow through) * GpioPullMode.DOWN == 0V (Tied to ground) * GpioPullMode.UP == 3V (Tied to power) You should use the correct mode to turn…
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* I need to find the velocity and position from it using Matlab. I used the integration once and twice but I'm not quite sure with the results. I guess I missed something like DC offset, increasing the error due to integration, etc.? This is not…
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Yes, you can use a timer to periodically read the signal. Check out this example where you would read the battery signal instead of the temp signal (Everything else is the same): https://github.com/mbientlab/MetaWear-SDK-Python/blob/master/examples…
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The max name length is 7 characters. Try something like MW1 in the first place and repeat your experiment.
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* what is the maximum number of bards that I can connect to PC bluetooth? I read 4, is it correct? 1 Dongle on PC. Up to 4 connections but only 100Hz total as per the BLE spec. * Is there a difference between Windows and Linux OS? Yes, Windows …
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Ok thanks for the update.
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Try to use an iOS device with a fresh MetaBase install to reset the board: http://mbientlab.com/troubleshooting
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Well you should always check that the boards are ok with our MetaBase iOS App. Let me know and confirm this first. Python and bluetooth is notoriously unreliable and unfortunately it's nothing to do with us or our code base.
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Hey @FraSabba, I would have done everything that you did, reset the board, use hci reset, reboot the Pi. You are still seeing issues after all this?
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Hey @FraSabba, The gyro samples do seem worse than they should be. What error rates are you getting if you lower the sampling frequency?
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Please reset your system. It seems something is corrupted. You can reset your board using the MetaBase App and you can reset your Bluetooth and Pi with some simple system commands (google this).
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By the way: I'd like to stream simultaneously accelerometer (25Hz), gyroscope (25Hz) and magnetometer data (20Hz) for 60 seconds from four different boards connected to the same integrated bluetooth antenna of RaspberryPi 3 model B. The expect…