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[Sticky] GPS Logger FAQ

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mm_dev
(@mm_dev)
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Joined: 11 years ago
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We have a GPS Logger from You. It has worked fine, but recently a problem has appeared. It shows the date totally wrong. The date is now September 25, 2001. The date of the GPS Logger is thus almost 20 years behind. The time seems to be wrong, too, at least for the hour part.

That is an issue of older GPS receiver chips and the way the timestamp is encoded in the GPS signal, see https://en.wikipedia.org/wiki/GPS_week_number_rollover for details. Unfortunately the only way to fix this is to replace the device.

This post was modified 6 months ago by mm_dev

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mm_dev
(@mm_dev)
Member Admin
Joined: 11 years ago
Posts: 321
Topic starter  

Is it possible to set the date and time on the GPS logger? If not, is it possible to get the time when connected to a computer via the USB cable?

The logger only gets its time from the GPS signal, it is not possible to override this if no signal can be received.


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mm_dev
(@mm_dev)
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Joined: 11 years ago
Posts: 321
Topic starter  

Stoppt die Aufzeichnung nach längerer Stillstandszeit bzw. startet sie wieder nach Wiederaufnahme einer Bewegung automatisch?

Der Logger hat keine Automatik was das Starten oder Pausieren der Aufzeichnung betrifft, diese muss manuell über den Schalter gesteuert werden. Wobei jeder Stopp der Aufzeichnung einen neuen Track anlegt.


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mm_dev
(@mm_dev)
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Joined: 11 years ago
Posts: 321
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I am interested in your GPS datalogger mainly for velocity and acceleration. I noticed that the demo file only outputs only a single direction acceleration. Which axis or orientation is this? Does it have the capabilty to output x, y, & z accelerations (since it has a tri-axis accelerometer) so I can evaluate with the software?
The „speed“ and „acceleration“ values in the software and exported CSV files are extrapolations from the GPS sensor. The accelerometer by default is used to calculate the device orientation. The underlying 3D acceleration values are only available when using the „raw“ export or recording data directly on the device, and need to be processed manually (the recorded raw values need to be divided by 8192 to get g-forces).

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mm_dev
(@mm_dev)
Member Admin
Joined: 11 years ago
Posts: 321
Topic starter  
Is there a driver for Ubunti for GPS logger?
The logger is using a USB-Serial converter from FTDI that is supported by default in most linux distributions, no special driver required. However it works different than most GPS receivers in that it requires special parameters for the connection to work and only transmits data after a trigger command has been sent, so most third-party applications will not be able to use it. You would need to access it over the dedicated API to receive data, as described in our programming guide.

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