Guarneri
About
- Username
- Guarneri
- Joined
- Visits
- 306
- Last Active
- Roles
- Member, Administrator, Moderator
Comments
-
Hi Mark, In general, there are couple of things to keep in mind when using accelerometers to calculate a "linear velocity": 1. Consider using a high pass filter to filter out the constant force of gravity and other low frequency noise, this wi…
-
Hi Nils, We have not tested any displacement calculations over a long period of time, but perhaps something like this would help: https://math.stackexchange.com/questions/90081/quaternion-distance Thanks, Yu
-
Hi Malarram, In order for us to figure out what frequency range your noise is in exactly, we would have to work with your data (which requires you to setup a support contract with MbientLab). However, I can suggest using a low-pass filter of some …
-
Hi Nub, Unfortunately, it is a known "difficult" problem to calculate the exact orientation of an object in rapidly changing motion. This is largely due to the relative nature of the data given to you by the IMU. For example, we only know the …
-
Hi Nub, I took a look at the 2 images that you linked in your post. It seems that you might want to find a more consistent way to gather/identify your throws by collecting or filtering your data differently. While it is obvious to me with the "nak…
-
Hi Asadm, Unfortunately, if what you are trying to measure is turning at a significantly faster rate than the maximum possible measurements of the gyroscope, there is unlikely to be any data analysis techniques that will help you recover that info…
-
Hi Michael, First I would recommend using a high pass filter to get rid of gravity in your data. This will likely reduce the variance in RMS by a lot. I also wouldn't worry too much about the % variance of RMS in a stationary position. In almost a…
-
Hi rpierson, When tackling a problem like this, it's good to figure out what kind of data we can get from our sensors. In this case, accelerometer provides us an absolute position relative to gravity (provided the device is stationary) as well as …
-
Hi Shiqi, Pure gyroscope data means results taken from the gyroscope without adding the accelerometer data. The equation for the complimentary filter is described in one of the blog posts I made a while back: http://projects.mbientlab.com/in…
-
Hi Shiqi, It is expected that the complimentary filter produces similar, but different results when compared to the pure gyroscope data. I cannot run and check your code, but I would not make the assumption that it is wrong simply because the two …
-
Hi Stu, Swift and Xcode are being updated fairly frequently. It's possible that our latest release for Swiftstarter is a bit outdated, which can cause compile errors. We'll look into it soon. Thanks, Yu
-
Also, please make sure that your Xcode is updated to the latest version.
-
Hi Physiowear, This type of error is usually caused by some kind of typo in one or more of the source files. Can you make a completely clean copy of the sample project and try again? Thanks, Yu
-
Hi Garvgarg, Yes, I think it would be very possible using multiple MetaWears located on either side of the elbow. We don't currently have any example code for this, so you may have to do some R&D work. Thanks, Yu
-
Hi Krunde, Stephen is currently on vacation right now. Normally I would try to answer your iOS questions, but it seems like you're already deep in discussion with him, so I will forward this question to him when he returns next week. Thanks fo…
-
Hi calebwong, Could you try to reset the boards and try again? Thanks, Yu
-
We will definitely release some samples using I2C in the next couple of weeks.
-
Hi pbljung, Are you compiling for the simulator? Bluetooth does not work on the iOS simulator and must be run on a real iOS device. Thanks, Yu
-
We're working on at least 1 sample data logging app for Android. We can probably give you a couple code snippets if you need something in particular now.
-
Hi, We were actually discussing this issue with the team yesterday. We'll get back to you sometime next week with an update. Thanks for your patience! Yu
-
Hi kandalf12, I assume you are using the Android API? If so, we are actually working on improving the API so that you can connect only to MetaWear devices in the near future! Thanks, Yu
-
Very cool!
-
Hi R, We will look into the issue with our Android Developer. Thanks!
-
As a general piece of advice, keep in mind some of the limitations of logging and streaming accelerometer data when designing your overall solution: - Streaming via BLE limited to <200hz from accelerometer due to bandwidth saturation - Logging…
-
It was tested on iOS 8.1 with an iphone 5, 6, and 6 plus. However, our in-house testing was rudimentary for this initial release. We'll look into it.
-
I won't speak to the issues related to the ANCS API, but the battery MUST be attached in order for the LED to work properly. Sometimes, the LED may work off the micro USB alone, but that is not a supported mode since the micro usb doesn't deliver en…
-
Will forward this to iOS API developer.
-
Let me take a look at your ANCS issues. Since this was a newly implemented feature, there might still be some bugs/issues. Thanks for your feedback!
-
Thanks for the info.
-
Id like to propose some options for replacement. Check your pm!