[Ovmsdev] GPS / NMEA integration

[Michael Balzer]

Anything looking wrong here?






Am 10.12.2017 um 00:55 schrieb 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
>
>
> _______________________________________________
> 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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