Search found 816 matches

by gplracerx
Fri Aug 10, 2018 8:09 pm
Forum: Trouble Shooting
Topic: Difficulty getting timer to trigger
Replies: 2
Views: 411

Re: Difficulty getting timer to trigger

Elemento1991, I purchased this app for autocross. You can't do autocross at all well without at least a 5Hz GPS. The 1Hz, heavily filtered, phone GPS is not good enough. It also tends to drift. That's usually OK for a race track where you can use a wide detection corridor, not so much for autocross....
by gplracerx
Fri Aug 03, 2018 9:50 pm
Forum: Tracks
Topic: Creating Tracks for Motocross
Replies: 5
Views: 1343

Re: Creating Tracks for Motocross

Hi Monika, narrow tracks like yours profit if trigger directions are set and detection corridor is narrow, so you should keep that approach. I was under the impression that setting a direction automatically set the detection corridor to wide. Is that no longer true? Or can you set the corridor width...
by gplracerx
Sun Jun 03, 2018 11:25 pm
Forum: Global Navigation Satellite System (GNSS) Sensors
Topic: VBOX Sport And HLT different data
Replies: 2
Views: 1217

Re: VBOX Sport And HLT different data

You can minimize accelerometer smoothing in HLT by increasing the accelerometer data rate to 100Hz from the default 30Hz in Expert Settings. This is a requirement, in my opinion, for autocross data logging.
by gplracerx
Thu May 10, 2018 11:16 pm
Forum: Trouble Shooting
Topic: Export very touchy in Android
Replies: 5
Views: 823

Re: Export very touchy in Android

svtdoug wrote:Ok, no background processing, but shutting off the screen for a moment and then back on?
Isn't that the definition of background?
by gplracerx
Thu May 10, 2018 11:15 pm
Forum: Trouble Shooting
Topic: HLT doesn't record acceleration data when using external GPS
Replies: 41
Views: 5207

Re: HLT doesn't record acceleration data when using external GPS

I have an iPhone 5s running iOS 11.3.1, XGPS160 and GoPoint BT1. I usually get accelerometer data with each fix. The times I don't, it's usually related to accelerometer calibration. I use CAM PRESET for calibration. I use the "right-hand drive" preset, but do not get any acceleration data with an ...
by gplracerx
Thu May 10, 2018 1:06 am
Forum: Trouble Shooting
Topic: Export very touchy in Android
Replies: 5
Views: 823

Re: Export very touchy in Android

Shouldn't the process be able to run in the background?
Video processing is very resource intensive. So no, it's not something that can run in the background. In fact, HLT doesn't run at all in the background and releases all resources far as I know.
by gplracerx
Thu May 10, 2018 1:02 am
Forum: Trouble Shooting
Topic: HLT doesn't record acceleration data when using external GPS
Replies: 41
Views: 5207

Re: HLT doesn't record acceleration data when using external GPS

I have an iPhone 5s running iOS 11.3.1, XGPS160 and GoPoint BT1. I usually get accelerometer data with each fix. The times I don't, it's usually related to accelerometer calibration. I use CAM PRESET for calibration. You can check that in the Administration/Settings menu. That preset assumes that th...
by gplracerx
Mon May 07, 2018 10:22 pm
Forum: Trouble Shooting
Topic: HLT doesn't record acceleration data when using external GPS
Replies: 41
Views: 5207

Re: HLT doesn't record acceleration data when using external GPS

Circuit Tools doesn't use measured acceleration data. It calculates it from the GPS position data and uses it's own smoothing algorithm. If you look at the exported .vbo file in Notepad or some other text editor, is the acceleration data there? I'm betting not.
by gplracerx
Wed Feb 14, 2018 3:37 pm
Forum: Using LapTimer
Topic: Yaw Rate Chart
Replies: 21
Views: 5551

Re: Yaw Rate Chart

The readings will still be valid for the vehicle frame of reference. But at high yaw angles, they won't look the same as values calculated from GPS data in the Earth frame, assuming your GPS antenna is reasonably close to the center of mass of your car. In theory you could calculate the yaw angle fr...
by gplracerx
Tue Feb 13, 2018 3:44 pm
Forum: Using LapTimer
Topic: Yaw Rate Chart
Replies: 21
Views: 5551

Re: Yaw Rate Chart

I am digging out the venerable thread after a splendind morning sliding around on an icy AX track this morning. If there is a lot of drifting, handbrake U-turns involved, should I use GPS-based acceleration data to compute the yaw rate? I am using a 20hz GPS with a consistent 0.77 HDOP (3m accuracy...