[Ovmsdev] GPS / NMEA integration

[Michael Balzer]

My multimeter says pin 79 (GNSS_ANT) is connected to GND (pins 77, 78 + 80 + frame etc.)…?

I've measured before & after unplugging the pigtail…

…and I think I found the bug: it seems our SIMCOM board design is wrong.

The official docs say GNSS_ANT is pin 79:




But we're using pin 78:





Mark, can you confirm this?

Regards,
Michael



Am 09.12.2017 um 23:46 schrieb Michael Balzer:
> I'm currently working on the NMEA module. The MUX channel is working, but I don't get a GPS fix.
>
> I've tried all GPS commands and now suspect my SIMCOM module having a hardware issue.
>
> I'm doing this:
>
> OVMS > level debug
> OVMS > power simcom on
>
> …wait for the MUX to be ready, then issue…
>
> OVMS > simcom muxtx 4 AT+CGPSNMEA=1
> OVMS > simcom muxtx 4 AT+CGPS=1,1
>
> …now the SIMCOM begins sending NMEA $GPGGA lines once per second looking like this:
>
> D (2937174) SIMCOM rx: f9 05 ff 35 24 47 50 47 47 41 2c 2c 2c 2c 2c 2c ...5*$GPGGA,,,,,,*
> D (2937174) SIMCOM rx: 30 2c 2c 2c 2c 2c 2c 2c 2c 2a 36 36 0d 0a 60 f9 *0,,,,,,,,*66*..`.
>
> Normally the modem should get a GPS fix within about 1-2 minutes and begin filling data in the $GPGGA record.
>
> But my modem won't, it just keeps sending empty fields.
>
> Can someone please try this with his/her module?
>
> To disable the GPS receiver, issue:
>
> OVMS > simcom muxtx 4 AT+CGPS=0
>
> Thanks & regards,
> Michael
>
> -- 
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>
>
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.teslaclub.hk
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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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