Servers by jDrones

UBlox ZED-F9P L1/L2 GNSS Unit

(Kenny Trussell) #41

My rover is a mower that I use in my fields. I want to let it run for hours (6 to 8) unattended except for checking in with Mission Planner every now and then. I have the base GPS permanently installed on my farm and use LoRa modules ( to communicate between.

(Nathan E) #42

Currently I only know that the sparkfun board ( has access to the pin, but it does not have on-board logging. I’ll be investigating if ardupilot is able to do the logging or not shortly. Unfortunately the ardusimple V1 boards do not have access to that EXT INT pin, so they will only be good to use for non-photogrammetric applications at the moment. They did note that V2 will have the feature.

Looks like orders of the sparkfun boards just caused them to go out of stock (they had 15 in stock 24 hours ago).

UBLOX ZED-F9P and arducopter 3.6.5
(Evan Williams) #43

I looked into the RAWX logging capability of ArduPilot, and it seems to me that it only supports logging of the raw “observables” for the purpose of PPK. There’s a particular message for logging interrupt pin behavior, but it’d be really cool (but not likely) for the GPS library to support logging it.

That said, there seems to be quite a bit of confusion surrounding the topic of RAWX logging (including, I believe, claims that it is currently dysfunctional). I still have to hunt down those discussions again, but it may have been an issue with the MissionPlanner utility for extracting .obs files from the dataflash . . . I can’t recall.

Either way, I figured the easiest way to get an F9P up and running for PPK would be something that solely builds the .ubx logs from UART . . . Current examples utilize an M8T, but I’m holding out hope that the F9P supports the same TIM1 logging as described here. It’s unclear from uBlox’ datasheet if it is even possible to use the INT pin in the same way as with the M8T.

(Nathan E) #44

I have had success in attempting PPK from the .obs files from Mission Planner, but I have never gotten many fix solutions, and I have never received accurate image timestamps for interpolation. I also do not receive all of the information as I would in the .ubx logs in the Emlid system, so you are correct that there may be limitations to Mission Planner’s log extraction.

I figured it would be easier to convince a developer to add the message to the logs. I might even take a stab at it since the basics (Multi-GNSS Raw Measurement Data) have already been implemented. According to the Interface Description manuals, BOTH the M8P and F9P have UBS-TIM-TM2 timing messages for time mark results. To me, this means that the EXTINT pins should both function the same as the article you posted.

This should be a high priority for @proficnc to claim that the Here+ is just as good as the Emlid Reach.

(Christopher Milner) #45

Congratulations Kenny! That is really great. I think 2019 will be the year these projects explode - but you sure are a pioneer! I’m starting my own project this week. -Chris

(Kenny Trussell) #46

Thanks, but I have Soooo many things to finish and make “permanent”. Will get it one day. It sure is a lot of fun and satisfaction. The help on this forum is amazing. I’m happy to be a part of it. If I can help you, ask away. I had a 2 hour Skype session with one person who is working on a mower project. It was a blast.