Thingy:91

[Hoang]

Dear, 

I received THINGY:91 from NordicSemi. I use 10pins cable to connect to nRF9160 DK to program for THINGY:91. 

and, I am using ncs_v1.0.0

I am trying to run asset_tracker application, 

and I am confusing about: 

1. which board should I select? I tried to use    ncs_v1.0.0/zephyr/boards/arm/nrf9160_pca10090

but after programming, the LED on THINGY:91 changed to RED color, and I couldnt connect it from nrfcloud 

I couldn't find pca20035 on ncs_v1.0.0. Do I need to use another version of ncs ?

2. How can I debug the output from THINGY:91

The terminal still shows the output from nRF9160 DK, nothing from THINGY:91

Thanks, 

Mvh

Hoang Nguyen

[Hoang]

Dear Bjørn Kvaale

I found nrf9160_pca20035 then I tried to program asset_tracker to THINGY:91, pressed the button (long press) then connected to nrfcloud and put the THINGY:91 outside. 

"Waiting for GPS Data...."

How to activate GPS? Do I need to use the external GPS antenna? 

Thanks 

Mvh

Hoang Nguyen

[Hoang]

Hi MJD093 Can you help?

[MJD093]

Ok, i think the issue isn't the SiP but GPS reception strength. That is an incredibliy long time to get a fix with 4-5 satellites in view.

The Thingy is a smaller PCB size so stands to reason that with less ground area, the receptivity of GPS antenna is also going to suffer some what. It will be less effective than the pca10090 which has a larger ground plane and more likely to fit correctly to the reference design of the Molex antenna.

The GPS receiver clearly works on the Thingy:91 as it does see satellites but it can't make that all important fix. This is either an issue with the GPS sensistivity or the conditions on the ground that are hampering GPS fixes.

Have you looked at the antenna circuit to see if there is a U.FL connector on it? If there is, try an external antenna and see if the results change.

[Hoang]

Hi MJD093

Ja, THINGY:91 has the U:FL connect, I will try to test with an external antenna 

[Hoang]

I got nothing now, even with and without an external antenna, maybe the weather is so bad now :(

Scanning [|] [1B][1;1H[1B][2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 508

[MJD093]

That's very odd

[Hoang]

and, sometimes, I got results look like that:

SPM: NS image at 0xc000
SPM: NS MSP at 0x200247a0
SPM: NS reset vector at 0x14431
SPM: prepare to jump to Non-Secure image.
***** Booting Zephyr OS build v1.14.99-ncs2-495-ga8933a2ead01 *****
Staring GPS application
Socket created
Getting GPS data...
[1B][1;1H[1B][2JTracking: 3 Using: 0 Unhealthy: 1
Seconds since last fix 0

Scanning [|] [1B][1;1H[1B][2JTracking: 3 Using: 0 Unhealthy: 1
Seconds since last fix 0

Scanning [/] [1B][1;1H[1B][2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 1

Scanning [-] [1B][1;1H[1B][2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 1

Scanning [\] [1B][1;1H[1B][2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 2

Scanning [|] [1B][1;1H[1B][2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 2

Scanning [/] [1B][1;1H[1B][2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 3

or:

Scanning [/] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 476

Scanning [-] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 477

Scanning [\] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 477

Scanning [|] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 478

Scanning [/] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 478

Scanning [-] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 479

Scanning [\] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 479

Scanning [|] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 480

Scanning [/] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 480

Scanning [-] [1B][1;1H[1B][2JTracking: 4 Using: 0 Unhealthy: 0
Seconds since last fix 481

Tracking: 4 but Using: 0 !!??

I cant understand it

[MJD093]

Ignore the first result, its a ghost response and isn't accurate, the results after the first scan are accurate to the state of the GPS modem.

Not all satellites will be used, detecting satellites is not the same using them to get a fix.

[Hoang]

Thanks so much MJD093

[MJD093]

If you view the NMEA sentences, it will show you all the information GPS uses.

https://www.gpsinformation.org/dale/nmea.htm

I believe the value in question is under sentence GSA which handles Satellite status. It can return a value of 1, 2 or 3 with regards to fix type. So you can detect the satellites but it can still return a value of 1 for no fix. GSA specifies how many satellites are used in the fix solution which will be reflected in the printk information.

[Hoang]

Thanks so much for your info, MJD093, Regards

[Hoang]

Hi Bjørn Kvaale, MJD093

I found the reason. It is my fault: 

#ifdef CONFIG_BOARD_NRF9160_PCA10090NS
#define AT_MAGPIO      "AT\%XMAGPIO=1,0,0,1,1,1574,1577"
#endif

with THINGY:91, must remove: AT\%XMAGPIO=1,0,0,1,1,1574,1577

Then, GPS will work. 

Thanks so much,

Mvh

Hoang Nguyen