Matt
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@MichaelG Please confirm that you are running firmware revision r1.3.4, improvements were made to idle state power consumption of the magnetometer hardware. Bluetooth advertisement current is not included in the data sheet idle current spec --…
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Hi @antela I'm not entirely sure I understand what you are asking about removing. Do you mean the metal battery clip/battery holder? The metal piece is not necessary to electrically connect the left and right sides of the board, so it will op…
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@rhristov r1.2.5 is the latest public release for MetaWearR. We have an upcoming release across all models that is in the final stages of testing. I reviewed the commit log, and there is one change that should fix your streaming lock up. As …
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@rhistov An issue with this failure signature was previously identified and fixed -- a corner case could cause our low priority TX queue to lockup. Notification type messages like accelerometer streaming data would get squelched, but high priorit…
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@tabchas The MetaMotion series boards do not support NFC in hardware or firmware. There is no way to attach an NFC antenna with the present designs.
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@tabchas All MetaWear models based on nRF51 series (everything excluding MetaMotionR and MetaMotionC) are the 16kB variant. MetaWear models based on nRF52 series have 64kB of RAM.
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Hi @pv000980 We agree that demagnetization only removes the static magnetic field and thus the effects of hard-iron distortion. The stainless steel of the coin cell case still contributes to soft-iron distortion being an iron alloy. Do you ha…
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@PHOLAN J-Link is the recommended method if you want to develop your own firmware. If you don't have one, the nRF52 DK is the development platform from Nordic that is compatible -- and has a built in J-Link debugger. We do not follow arduino …
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@tmalik Could you take a couple steps to rule out firmware or device state corruption? * Update firmware using the latest app store release of the MetaWear App (even if the firmware is up to date, re-update the firmware) * Test Magnetometer data…
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@JorgePereira We do not recommend using 2xAA with the MetaTracker. Beyond battery mounting issues, the battery level monitor is not setup for Alkaline chemistry. Further, at around 50% discharge the AA batteries will not provide enough voltage f…
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alessandromontanari Can you confirm that the 3v rail is driven immediately after connecting the battery, before connecting USB? The only thought that comes to mind to explain why inserting USB matters if is if the battery protection overcurren…
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@delaerpriest I would read back the contents of flash to verify that the NFC pin configuration gets written. The UICR is in a different memory segment and may require extra steps to program. When I say early, I mean shortly after initializati…
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@alessandromontanari What do you mean when you say "plug in a battery"? It is very easy to trip the over current protection on these small LiPo batteries, when in this state they stay cut off until they are applied a charge voltage. Once you "plu…
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@Chris14 We did some tests verifying the rotation axes. It seems that the issue here is just convention for what is pitch, roll and yaw. We verified that rotation around each of the physical x, y, z axes corresponded to euler angle values wit…
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@tbfs25 The I2C module is designed to work with 8 bit registers. For a 16-bit write, simply pass the high order byte as the register address, and the low order byte as the first byte of the payload. For a read to a 16-bit register, dependi…
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gcgl09zjq Our sensors do not presently compensate the magnetometer for hard or soft iron effects.
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@alessandromontanari That should mirror the default configuration of our devices. You said you had an SD card attached. How is it wired and is anything else externally connected?
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@alessandromontanari The battery charger seems to be misbehaving in some way. It could be how your pins which interface the charger are configured. The 5V sense pin should only be set as an input. Setting it as output high may pull the charg…
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alessandromontanari Have you tried feeding 3.7V from a lab power supply or similar? The boards are normally operated from only a battery at 3.0-4.2V and there are no issues. Vusb is designed to be floated when not charging so it should not be a …
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sjmerel We observed similar but less severe offset on devices in the lab. The "Zero-g Offset" spec for the BMI160 (most models) is +/- 150mg, and for the BMA255 (select models) is +/- 60mg. To improve the offset, you could self calibrate a…
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alessandromontanari There should not be a problem with how you've connected the monitor. The 3V supply is regulated down from the 3.0-4.2V of the battery source, so any current demands on the 3V supply would be limited by that regulator. C…
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alessandromontanari How do you have the power monitor attached to the MMR board? Our R series boards have no problem operating from an external power supply across +Bat. If the board is functioning with the USB connected, this is likely suppl…
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@denisdarmon 1. The I2C pins are pulled up to 3.0V using bias resistors built into the BLE SoC. Resistance is approximately 13k. 2. The MetaMotionR I2C interface can tolerate 3.3V. There will be sufficient noise margin for correct operation o…
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@DanT The way that circuit is designed, it most likely needs the full 5V for the amplifier to operate correctly. If you are able to provide the full 5V or find a module designed for 3V operation, you should be able to make use of the digital outp…
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@patrice Re: NDoF 50/100 Hz Mag, the sensorfusion algorithms in NDoF only support magnetometer input at 25Hz. However, changing the settings (which primarily involve oversampling) on the magnetometer can produce a more responsive or more averaged…
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@Riley @lionfish The way the sensorfusion module is presently implemented, if the sensorfusion module is explicitly disabled, then the fusion engine will have its state reset. This should be equivalent to a soft reset once you re-enable the modul…
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@patrice There is no easy way to change the antenna configuration on a MetaWear, and performing such modifications would invalidate the radio certifications (CE/FCC/IC) so we cannot recommend doing so. Normally the 2.4Ghz band couples well to …
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@rajmishra I would start by adding a 1M ohm resistance across the piezo, as they suggest in the arduino tutorial linked by sparkfun. Piezo elements are capacitive in nature, and may be accumulating significant charge over time. Before taking thi…
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@fryjs We have a firmware solution to this that is in testing now. Expect to release this with some other minor fixes within the next couple business days. It will take a little longer before it is exposed in the APIs. Matt
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@alanhortz Interesting technology. It would not work off the shelf with MetaWear because there is no protection circuit, battery charge current is a little low, and maximum discharge current is a little underrated. MetaWear needs to be able to bu…