Matt
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Hi @seamus I ran some tests with an oscilloscope and confirmed a successful read of addresses higher than 0x07 via the I2C module. It is also worth nothing that if an external chip does not respond to a device address, the I2C module will retu…
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Hi @Tine Great detail on what you have tried. In the first case, yes, the bluetooth link is a little too slow. Bluetooth LE uses a low duty cycle communication scheme -- it has a short conversation every so often. Depending on your platform, …
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@jgummeson @sonalideo : Eric and I recreated the use case as best we could given the information we have, and we were not able to reproduce any crashes. Lets start by confirming versions, and if we are all on the latest we will need more details t…
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@jgummeson : Could you confirm the version of the firmware and API are you running? We made a many enhancements to the logger to improve robustness and reliability that were released in r1.1.0. Your use case should work as expected, however downl…
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@Gadget: The new simple enclosure looks great! I had a chance to cut the lid piece on the laser, but only had access to a blue acrylic sheet. The dimensions ended up being slightly off but I have not yet figured out why. The four …
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@JpEncausse : once your new die has settled, you can use the accelerometer to determine its orientation. The accelerometer can see the force of gravity, which will tell you how it is oriented. There are six outcomes for the accelerometer orientati…
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@sonalideo : The logger works with 4 byte words, variable length entries are not supported at this point. The technical complexity is very high to make variable length entries work reliably with power cycling, readout disconnections, etc -- and the…
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This is a major point release with many new internal and external features. Full release notes: - Improved log readout algorithm for robustness and reliability - New task scheduler and queueing system - Adds multi priority main task queue …
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@Gadget: The DXF file looks good, and the dimensions inferred by the cutter software seem be to right. I will have a chance to use a cutter later this week and make a few pieces to test the size. The simple enclosure looks awesome, I'll print one…
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@Gadget: We have been getting the documentation cleaned up for release. The datasheet is live on the getting started page. Here is the direct link: https://mbientlab.com/docs/MetaWearCPSv0.5.pdf.
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@alessandromontanari The charger circuitry is completely independent of firmware control, and will charge regardless of the state of the microcontroller. Something in your system is likely interfering with the trickle charge of the battery. …
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@Gadget: Regarding the diameter, I would increase it by 0.15-0.25mm. It fits but it is tight and difficult to remove. Regarding the DXF file, the perspective is challenging for me to do much with. I have not been able to get a clean top perspect…
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Hi Sonalideo, we are using a coin holder from Linx technologies, datasheet available here: http://www.linxtechnologies.com/resources/diagrams/bat-hld-001-thm.pdf There are four small pads which form the negative contact, which look like this: …
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@Gadget : Version 2 of the waterproof case prints out very nicely. I had to force the MetaWearC slightly, but it fit. Seems like a 1.5mm o-ring is much easier to source. Acrylic top would be great, I'll try cutting one if you could export a DX…
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@Gadget: Here are some o-rings that might be good fits. It looks like McMaster doesn't stock a 27mm diameter, 1mm wide o-ring. The 26mm or 27mm diameter, 1.5mm wide might work well though. http://www.mcmaster.com/#o-rings/=9p6q8gvpduii6ee8l1
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@Gadget: If you want to update the files, I will wait to print the new version. I'll take a look to see if I can find a source for the o-rings convenient enough for most users -- Amazon over McMaster or similar. Otherwise maybe we can place a bul…
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@Gadget: I got both test files printed off. From what I can empirically tell, the smaller features start from the left of the models. With both tests, the second from the left has the best fit. In the diameter test, the left most is too tight…
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@Gadget The new lid fits the case very well, and the twisting latch mechanism works well. I would say the fit on the lid is ever so slightly tight. It would definitely stay put just with friction, and it had to be very slightly forced to fit tog…
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@minmax I'm looking into the possibilities for enabling these functionalities in firmware. Item 1: Eric and yourself have already discussed how this is possible with the Sample/Delay filter. It handles the general case of an n-deep delay. W…
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@Gadget I'm printing with a 0.4mm nozzle. The summary captured everything pretty well. The walls seem thick enough to me though. I was unable to test the latch mechanism because the diameter tolerance would not allow the two pieces to int…
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@Gadget Had a chance to print your case out last night. It printed out with really good quality. Did not have any issues slicing with Simplify3D or printing on a FlashForge Creator Pro. The latching mechanism printed pretty well for ha…
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@propan Regarding BT activity frequency: There are a couple variables in play, primarily the advertising interval and connection interval. Change in connection state will transition between two different frequencies. Overall radio traffic will a…
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@sonalideo In a soon to be released firmware, the math operation filter will be enhanced to provide multiple input functionality. For the use case you described, it will allow you to: * Take 3 channels of 16 bits as input * Right shift each cha…
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@propan We have experienced similar disturbances with the ADC and the On-die temperature sensor from droop on the 3V supply caused by current spikes during radio events. The radio bursts up to 10-15mA depending on TX power settings. We believed …
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Hi Sonalideo. The MetaWearC will ship by default with a coin cell holder clip that can hold a CR20XX in place without any additional casing. That way it is standalone and ready to go out of the box. The coin cell holder can be removed if you are…
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Hi Propan, We have a sighting of a similar issue with I2C reads from our iOS guru. In certain cases, which we have not yet identified, a read command will not execute properly. When a second read is requested both are executed together. This so…
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Hi Sonalideo, there is no way to do this at present with the filters we have, but I can certainly see the value. We have a firmware release coming up very soon, and I will see how we can enable this -- likely in a way a way that is generally useful…
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Hi Sonalideo. Presently the accelerometer and gyro output are 6 bytes in total -- 2 bytes (16 bits) per axis. Using the data processing module, you could apply a root mean square (RMS) or root sum square (RSS). RSS is equivalent to the vector ma…
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@veeru, MetaWear has in internal system for executing sequences of commands local to the device. This can be used with multiple I2C operations to issue a start command followed by a read data command. They can also be connected to a timer to perfo…
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@Jeremy, it is a little unconventional to skip the register address in I2C so it is not presently supported in our firmware. Have you tried passing an address of 0x00 in when doing the read and write to see that works with the sensor? Often times …