[Ovmsdev] GPS / NMEA integration

[Michael Balzer]

Nonsense, we're using pin 79, forget that…

…still, it's shorted to GND on my module.



Am 10.12.2017 um 00:53 schrieb 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
>> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
>
> -- 
> 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
> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev

-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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