Problem with GPS module RAK12501

WisBlock
1

I am evaluating the RAK12501 GNSS module with a RAK11310 WisBlock Core and have encountered an issue receiving data.

Setup

Base Board: WisBlock

Core: RAK11310

GNSS Module: RAK12501 (L76K)

Slot used: Slot A (the datasheet states Slot A or D are acceptable, while the GitHub example specifies Slot A)

Firmware: Unmodified “WisBlock Sensor RAK12501 GPS Board Programming Guide” example from your GitHub repository

IDE : Arduino BSP in windows

Issue

The board powers on correctly, but even after leaving the device outdoors for more than two minutes, no NMEA data appears on Serial1. I have confirmed that the sketch uploads successfully and that the USB serial port is functioning.

What can I do to solve this problem?

I am getting print in my serial monitor.

GPS uart init ok!
status: Connected
latitude: 	longitude: 
status: Connected
2

Welcome to the forum @Hoon

What example are you using. The example from our Quick Start Guide Basic Sample Code for RAK12501 is giving a different log output, not what you are showing.

Log output of the original example:

(N):LAT=14.421363 (E):LON=121.006958 SAT=12 PREC=1.10
(N):LAT=14.421366 (E):LON=121.006989 SAT=12 PREC=1.10
(N):LAT=14.421384 (E):LON=121.007011 SAT=9 PREC=1.90
(N):LAT=14.421396 (E):LON=121.007034 SAT=8 PREC=1.90
(N):LAT=14.421404 (E):LON=121.007050 SAT=8 PREC=1.90
(N):LAT=14.421407 (E):LON=121.007057 SAT=7 PREC=2.20
(N):LAT=14.421411 (E):LON=121.007080 SAT=5 PREC=3.70
(N):LAT=14.421418 (E):LON=121.007095 SAT=5 PREC=3.70

Where are you testing. Location fix is working outside of buildings. If the view from the antenna to the satellites is obscured by buildings, roofs, … it will in most times not be able to get a location fix.

Beside of above, I found a problem with the used library and it seems TinyGPS is not working well with the L76K RAK12501 module.

I changed the code to use the TinyGPSPlus library and it works well.==> RAK12501_GPS_L76K

3

Thank you It worked!

4

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