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Adafruit Ultimate GPS FeatherWing MTK3339
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Re: Adafruit Ultimate GPS FeatherWing MTK3339

by adafruit_support_bill on Thu May 28, 2020 1:37 pm

We should first confirm that the diagnosis is correct before attempting to fix it.

Try running the GPS example code from the library, so there will be no FONA communication to interfere. Do you get correct readings when running the example code?

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by Josh_1 on Thu May 28, 2020 1:45 pm

adafruit_support_bill wrote:We should first confirm that the diagnosis is correct before attempting to fix it.

Try running the GPS example code from the library, so there will be no FONA communication to interfere. Do you get correct readings when running the example code?


Are you meaning all pluged but just load the following code: Adafruit GPS Library -> GPS_HardwareSerial_Parsing?

If is that, here the image. The fist location on the screen is wrong and the following one is ok. And is jsut the probram GPS_HardwareSerial_Parsing from the library, without modifications.
Screenshot.PNG
Screenshot.PNG (160.3 KiB) Viewed 1524 times

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by adafruit_support_bill on Thu May 28, 2020 2:25 pm

OK. So it is not interference with FONA communication. I will check with some of our GPS experts to see if anyone has seen this issue before.

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by Josh_1 on Thu May 28, 2020 3:00 pm

Great, thanks you and your community so much and we will stay on air if some of you need any information that we can provide to facilitate the proces.
Best regards,

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by JoanCS on Sat May 30, 2020 7:52 am

The reading of the coordinates using the library is incorrect. The speed should also be zero !!!

Here is the comparison of the data, using the same hardware, without library with Adrafruit library <Adafruit_GPS.h>
Data capture, without using the library:

******Data OK
$PGTOP,11,2*6E
$GPGGA,113559.000,4151.1972,N,00213.9096,E,1,05,1.45,520.8,M,51.1,M,,*63
$GPRMC,113559.000,A,4151.1972,N,00213.9096,E,0.57,242.36,300520,,,A*69
$PGTOP,11,2*6E
$GPGGA,113600.000,4151.1969,N,00213.9092,E,1,05,1.46,521.1,M,51.1,M,,*69
$GPRMC,113600.000,A,4151.1969,N,00213.9092,E,0.60,245.89,300520,,,A*6F
$PGTOP,11,2*6E
$GPGGA,113601.000,4151.1967,N,00213.9086,E,1,05,1.45,521.4,M,51.1,M,,*65
$GPRMC,113601.000,A,4151.1967,N,00213.9086,E,0.69,249.90,300520,,,A*68
$PGTOP,11,2*6E
$GPGGA,113602.000,4151.1967,N,00213.9090,E,1,05,1.45,521.6,M,51.1,M,,*63
$GPRMC,113602.000,A,4151.1967,N,00213.9090,E,0.58,249.64,300520,,,A*65
$PGTOP,11,2*6E
$GPGGA,113603.000,4151.1967,N,00213.9095,E,1,05,1.46,521.9,M,51.1,M,,*6B
$GPRMC,113603.000,A,4151.1967,N,00213.9095,E,0.48,251.42,300520,,,A*6D
$PGTOP,11,2*6E
$GPGGA,113604.000,4151.1968,N,00213.9094,E,1,05,1.45,522.0,M,51.1,M,,*6B
$GPRMC,113604.000,A,4151.1968,N,00213.9094,E,0.47,258.33,300520,,,A*64

Data captured with the library l <Adafruit_GPS.h>
*******Data KO
Location: 41513.1992N, 213.9129E
Speed (knots): 0.26
Speed (Km/h) : 0.48
Angle: 49.46
Altitude: 524.90
Satellites: 5
Fi GPS Ok ----
11:37:00.60576
Date: 30/5/2020
Fix: 1 Quality: 1
GPS --------->
Location: 41513.1992N, 213.9131E
Speed (knots): 0.32
Speed (Km/h) : 0.59
Angle: 47.85
Altitude: 524.90
Satellites: 5
Fi GPS Ok ----
11:37:02.62576
Date: 30/5/2020
Fix: 1 Quality: 1
GPS --------->
*****************
In conclusion, the bookstore does not work properly !!!

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by adafruit_support_bill on Sat May 30, 2020 8:48 am

GPS speed is not accurate at slow speeds. It is based on the change in location over time. Since even with a stationary unit, there is often some slight variation in the location reading, this can be interpreted as motion and yield a non-zero speed reading.

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by JoanCS on Sat May 30, 2020 8:57 am

Thank you, this variation in speed, not worrying.

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by adafruit2 on Sun May 31, 2020 6:20 pm

ok in the GPS arduino library, please try earlier versions of the library
versions.png
versions.png (19.19 KiB) Viewed 1683 times


current version is 1.5.0 please try 1.4.0 etc

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by JoanCS on Wed Jun 03, 2020 6:50 am

Good morning. We have checked that with version 1.4.0 it does not give this error and it seems to work fine.

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by adafruit2 on Wed Jun 03, 2020 1:30 pm

ok we have alerted the maintainer at https://github.com/adafruit/Adafruit_GPS/issues/120

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by JoanCS on Mon Jun 15, 2020 6:32 am

With the Adafruit GPS Library version 1.5.1 this problem is solved.
thanks

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by adafruit_support_bill on Mon Jun 15, 2020 6:45 am

Good to hear that the problem has been resolved. Thank you for the follow-up. :)

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by JoanCS on Thu Jun 25, 2020 9:33 am

Version 1.5.1 of the "Adafruit GPS Library" fixes this problem

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by JoanCS on Mon Jun 29, 2020 5:20 am

With the Adafruit GPS Library version 1.5.1 this problem is solved.

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Re: Adafruit Ultimate GPS FeatherWing MTK3339

by saraTU on Fri Jul 31, 2020 1:32 pm

Hello,
I don't know is it a right place to ask my question.
I want to know current of sleep mode in MKT3339 (GPS ultimate) and its wake up time to calculate in my circuit design and compare it to other GPS chip set. I didn't find it in datasheet . Can any body help me with that?

Kind

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Please be positive and constructive with your questions and comments.