[Ovmsdev] GPS / NMEA integration

Mon Dec 11 09:47:28 HKT 2017

Thanks for this. Code looks good. A lot neater than the kludgy way we had to poll for gps data in v2.
I do like the gsm mux - a pita to implement, but very powerful.

Regarding the antenna, as expected the reply from China side is:

It is designed for passive antenna at the moment (I think they just took the default diagram for SIM5360). I have asked them to make a change in production version to switch to use active antenna circuit. Much easier to find active antennas, and they are half the price of the passive ones.

The existing boards are fairly easy to ‘mod’, if required. Seems to be just a 47nH + 10R in series between antenna and VDD (3.xV).

Or just use a passive antenna. Something like this?

https://www.aliexpress.com/item/Passive-GPS-antenna-Frequency-1575-42MHZ-SMA-J-connector-1-5M-SMA-GPS-Passive-Antenna-2PCS/32588132155.html <https://www.aliexpress.com/item/Passive-GPS-antenna-Frequency-1575-42MHZ-SMA-J-connector-1-5M-SMA-GPS-Passive-Antenna-2PCS/32588132155.html>

Regards, Mark.

> On 10 Dec 2017, at 10:33 PM, Michael Balzer <dexter at expeedo.de> wrote:
> 
> Works, pushed:
> 
> OVMS > config list modem
> modem
>   apn: hologram
>   apn.password: 
>   apn.user: 
>   enable.gps: yes
>   enable.gpstime: yes
>   enable.net: yes
>   enable.sms: yes
> 
> OVMS > power simcom on
> Power mode of simcom is now on
> I (28084) events: Signal(power.simcom.on)
> I (28084) simcom: State: Enter PoweringOn state
> I (28084) simcom: Power Cycle
> I (34414) simcom: State: Enter PoweredOn state
> I (53514) simcom: State: Enter MuxMode state
> I (53514) gsm-mux: Start MUX
> I (53514) gsm-mux: StartChannel(0)
> I (53524) gsm-mux: Channel #0 is open
> I (53524) gsm-mux: StartChannel(1)
> I (53534) gsm-mux: Channel #1 is open
> I (53534) gsm-mux: StartChannel(2)
> I (53544) gsm-mux: Channel #2 is open
> I (53544) gsm-mux: StartChannel(3)
> I (53544) gsm-mux: Channel #3 is open
> I (53544) gsm-mux: StartChannel(4)
> I (53554) gsm-mux: Channel #4 is open
> I (54514) simcom: State: Enter NetStart state
> I (54514) gsm-nmea: Startup
> I (62414) events: Signal(system.modem.gotgps)
> 
> OVMS > metrics list utc
> m.time.utc                               1512915059Sec
> 
> OVMS > metrics list .p.
> v.p.altitude                             346m
> v.p.direction                            341.2°
> v.p.gpshdop                              1
> v.p.gpslock                              yes
> v.p.gpsmode                              AA
> v.p.gpsspeed                             0Kph
> v.p.latitude                             51.3023
> v.p.longitude                            7.39013
> v.p.odometer                            
> v.p.satcount                             11
> v.p.speed                               
> v.p.trip                                
> 
> OVMS > power simcom sleep
> Power mode of simcom is now sleep
> I (103104) events: Signal(power.simcom.sleep)
> I (103514) simcom: State: Enter NetSleep state
> I (103514) gsm-ppp: Shutting down (soft)...
> I (103514) gsm-nmea: Shutdown (direct)
> I (103514) events: Signal(system.modem.lostgps)
> 
> OVMS > power simcom on
> Power mode of simcom is now on
> I (154494) events: Signal(power.simcom.on)
> I (154514) simcom: State: Enter NetStart state
> I (154514) gsm-nmea: Startup
> I (159414) events: Signal(system.modem.gotgps)
> I (160544) simcom: PPP Connection is ready to start
> I (161514) simcom: State: Enter NetMode state
> I (161514) gsm-ppp: Startup
> 
> 
> I've changed direction & altitude to float, missed those on the previous rework.
> 
> I've removed setting "m.time.utc" from the Twizy and Kia modules. On the Roadster, set "enable.gpstime" to "no".
> 
> I'm getting around 10 satellites all the time with my GSM antenna and our currently very snowy weather, so it seems we don't need active GPS antennas with this module. But I haven't had it on the road yet.
> 
> Regards,
> Michael
> 
> 
> Am 10.12.2017 um 09:23 schrieb Michael Balzer:
>> Toms comment made me test my GSM antenna, lo and behold, it works:
>> 
>> D (298314) gsm-nmea: IncomingLine: $GPGSV,2,1,06,01,,,31,08,26,174,30,14,45,082,37,19,01,323,23*42
>> D (298314) gsm-nmea: IncomingLine: $GPGSV,2,2,06,22,68,234,25,32,,,35*44
>> D (298324) gsm-nmea: IncomingLine: $GLGSV,2,1,06,66,19,039,43,82,56,144,38,75,11,007,34,81,07,142,16*6A
>> D (298334) gsm-nmea: IncomingLine: $GLGSV,2,2,06,67,73,053,46,68,45,213,31*6F
>> D (298334) gsm-nmea: IncomingLine: $GPGGA,080552.0,5118.139329,N,00723.395918,E,1,02,2.1,316.7,M,47.0,M,,*50
>> D (298344) gsm-nmea: IncomingLine: $GNGNS,080552.0,5118.139329,N,00723.395918,E,AA,06,2.1,316.7,47.0,,*60
>> D (298344) gsm-nmea: IncomingLine: $GPVTG,,T,0.0,M,0.0,N,0.0,K,A*0D
>> D (298354) gsm-nmea: IncomingLine: $GPRMC,080552.0,A,5118.139329,N,00723.395918,E,0.0,,101217,,,A*49
>> D (298354) gsm-nmea: IncomingLine: $GPGSA,A,2,08,14,,,,,,,,,,,2.3,2.1,0.9*35
>> D (298364) gsm-nmea: IncomingLine: $GNGSA,A,2,08,14,,,,,,,,,,,2.3,2.1,0.9*2B
>> D (298364) gsm-nmea: IncomingLine: $GNGSA,A,2,66,67,75,82,,,,,,,,,2.3,2.1,0.9*2F
>> 
>> 
>> My GPS antenna is an active one for V2, it seems the current module does not support active antennas.
>> 
>> Actice GPS antennas are the standard choice over here. If the SIM5360 can do without, that will eliminate another energy drain, so is good. Users will need to know they'll need another antenna.
>> 
>> Regards,
>> Michael
> 
> -- 
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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