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gadgetPool.de :: View topic - watch out for this problem if you use GPS module
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watch out for this problem if you use GPS module

 
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jferguson
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Joined: May 20, 2011
Posts: 17
Location: US East Coast

PostPosted: Sun Aug 19, 2012 1:45 pm    Post subject: watch out for this problem if you use GPS module Reply with quote

After endless fussing with my code which runs on an Arduino Uno and reads a Skylab SKM 53 (Mediatek 3329) GPS module I've discovered a problem. After starting the software, the LCD display and starting to read the GPS, it seemed to die after a few seconds and although emitting clock signals, and nmea sentences, stopped indicating position changes if there wasn’t much movement.

It turns out that there is a speed threshold function built into the firmware which turns-off new position indications if the chip hasn’t moved faster than some threshold speed – default appears to be 2 M/sec. This is for use in cars and is intended to restrict display of position “hunting” when the car is parked. No good for use on anchored boat where movement is less than 2 M/sec.

There is a command to reset threshold to lower speed or nothing.
examples:
$PMTK397,0*23 <CR><LF>
$PMTK397,0.2*3F <CR><LF>
$PMTK397,2.0*3F<CR><LF>
first reset threshold to 0 m/sec, second to 0.2 m/sec.

First is one i chose for boat anchor drag detecting. I will need to smooth output a little, but without the position information, i was wasting my time.

These changes cannot be written to flash so need to be added to startup.

From searching the web, it does not look like very many people know about this. Shocked Shocked
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FWallenwein
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Joined: Mar 26, 2006
Posts: 419
Location: Mannheim / Germany

PostPosted: Wed Oct 10, 2012 10:11 am    Post subject: Reply with quote

Thank you for this !!
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