Connecting a backup battery to the MTK GPS

If you use the DIYDrones MediaTek GPS, you're probably aware of the fact that, on each activation, it make take a very long time to get proper satellite lock. The reason is that it always starts from scratch; it is not aware of it approximate geographic location, not of the time.


The reason for this is lack of backup battery. Data is completely erased once you disconnect the main battery.

The GPS module itself has a backup battery input. I added a new Wiki page to the ArduPirates Wiki that shows how to connect an external battery to that input.

http://code.google.com/p/ardupirates...backup_battery  (link fixed)



Dror

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Replies to This Discussion

Permalink Reply by Sebastian Gralla on April 18, 2011 at 5:07am

early versions of Mediatek GPS had a backup battery, they was removed because it made ist "unstable"

I don't know how this affects the lock or something, i never had one

Permalink Reply by Andrew Radford on April 19, 2011 at 3:01am
Does the MTK protocol include gets and sets for almanac information for Assisted GPS?
Permalink Reply by Chris Barlow on April 19, 2011 at 5:25am

So i might think about doing this, however your link doenst work...how long have you been using this without any issues?

 

(edit by moderator: link fixed)

Permalink Reply by Dror Caspi on April 19, 2011 at 10:46am
Only tested very shortly so far...  I did the change so it is very easily reversible, and I see not real risk.

ModeratorPermalink Reply by John Church on December 31, 2011 at 1:12am

Bumping an old thread, but... Dror, how is this mod holding up for you? Notice any ill effects?

Permalink Reply by Dror Caspi on December 31, 2011 at 1:47am

This is indeed old history.  It did not work well, it failed to lock most of the time.  I believe the ACM (at that time, ArduPirates s/w) had problems synchronizing with the GPS module but I don't really know, I had no chance to really debug this, as I lost my quad a short time after that.

Dror

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