FONA SIM808 GPS will not turn on

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saulahebert
 
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FONA SIM808 GPS will not turn on

Post by saulahebert »

When I try to turn on the GPS using the FONA_Test sketch, I get the message ...

FONA> O
---> AT+CGPSPWR?
<--- ERROR
Failed to turn on
FONA>

I get the same messages for any command for GPS or GPRS.
The cellular functions seem to work fine as I have tested SMS both send and receive.
Could this be a possible bad shield? I have nothing else hooked up to the Uno and the LiPoly battery is fully charged and the unit is receiving power via USB.

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adafruit_support_mike
 
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Re: FONA SIM808 GPS will not turn on

Post by adafruit_support_mike »

Post a photo showing your hardware and connections and we'll take a look. 800x600 images usually work best.

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saulahebert
 
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Re: FONA SIM808 GPS will not turn on

Post by saulahebert »

IMG_0109.JPG
IMG_0109.JPG (109.87 KiB) Viewed 2109 times
The FONA 808 shield in on a Uno V3, connected via USB to computer. There is no other circuitry hooked up. The LiPoly battery is fully charged and the passive GPS antenna is attached.

Saul

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Franklin97355
 
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Re: FONA SIM808 GPS will not turn on

Post by Franklin97355 »

Can you post one from the bottom of the shield so we can see the soldering?

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saulahebert
 
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Re: FONA SIM808 GPS will not turn on

Post by saulahebert »

as requested...
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IMG_0110.JPG
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adafruit2
 
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Re: FONA SIM808 GPS will not turn on

Post by adafruit2 »

be sure you are grabbing the latest library and example code, the GPS commands changed from CGPS to CGNS (and are a little different besides)

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saulahebert
 
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Re: FONA SIM808 GPS will not turn on

Post by saulahebert »

Thank you! This turned out to be the problem... V.1 GPS commands on a V.2 GNSS SIM808 chip

Do you have a version of the FONA program and library modified for the GNSS commands?

I do not see one available for download.

Saul

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adafruit2
 
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Re: FONA SIM808 GPS will not turn on

Post by adafruit2 »

yeah the library has been updated, it now checks which version of the module is used
https://github.com/adafruit/Adafruit_FO ... 6974ae6488

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laurchar
 
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Re: FONA SIM808 GPS will not turn on

Post by laurchar »

I nearly got the same problem, so I use the same discussion.
I have FONA V2 based on MP3337, the GPS is working well, but I use it without no GSM card.
So, GPRS positioning is not working, is that right : should I have a SIM card to get GPRS position ?
Thanks,
Laurent

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adafruit2
 
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Re: FONA SIM808 GPS will not turn on

Post by adafruit2 »

yes! you must have a SIM card - GPRS uses the cell network

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laurchar
 
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Re: FONA SIM808 GPS will not turn on

Post by laurchar »

But, it seems that Adafruit_FONA_3G has not been updated for GNSS and V2 module.
GPS is no more working if I use Adafruit_FONA_3G.

Laurent

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adafruit2
 
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Re: FONA SIM808 GPS will not turn on

Post by adafruit2 »

the FONA 3g does have GPS but its not very good - it takes a long time to get a fix!

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