Smartphone Laptimers
Discussion
Sorry jumping on this thread as well. I've just bought an e36 M3 Evo for trackdays today and having been out the scene for a few years was researching lap timers and video cameras and saw this re the harrys lap timer.
One question does anyone know how much memory the video uses as my iphone is only 16 gig and i'm thinking it wouldn't take long to fill it up on video and timing mode?
Also are there any other options that are good and not phone based, historically I always had a bolt on mount for my video camera to my cage and a separate timer but if I can combine the two that would be great.
One question does anyone know how much memory the video uses as my iphone is only 16 gig and i'm thinking it wouldn't take long to fill it up on video and timing mode?
Also are there any other options that are good and not phone based, historically I always had a bolt on mount for my video camera to my cage and a separate timer but if I can combine the two that would be great.
mikeknivett said:
Sorry jumping on this thread as well. I've just bought an e36 M3 Evo for trackdays today and having been out the scene for a few years was researching lap timers and video cameras and saw this re the harrys lap timer.
One question does anyone know how much memory the video uses as my iphone is only 16 gig and i'm thinking it wouldn't take long to fill it up on video and timing mode?
Also are there any other options that are good and not phone based, historically I always had a bolt on mount for my video camera to my cage and a separate timer but if I can combine the two that would be great.
Harry's Pro is a good simple videos/data recorder HOWEVER do not trust the laptimes if you do not have an external GPS receiver as the iPhone one is not accurate enough on some tracks. I ran a Performance Box parallel some laps were 0.5s shorter on Harrys.One question does anyone know how much memory the video uses as my iphone is only 16 gig and i'm thinking it wouldn't take long to fill it up on video and timing mode?
Also are there any other options that are good and not phone based, historically I always had a bolt on mount for my video camera to my cage and a separate timer but if I can combine the two that would be great.
The videos take around 1Gb per 15 mins or so. My 16Gb iPhone was half empty for the trAckday and the video filled up the phone late afternoon. I recommend syncing off all videos and most photos and music before you go. Give yourself as much space as you can. Alternatively you can delete sessions easily that are not of interest as you come in.
the GPS accuracy isn't great without external GPS. The trace on varley's video is a good example of how bad it can be.
If the sample rate is 10hz and assuming GPS position is 100% accurate (it isn't) then it could be 0.1 seconds out at the start of the lap and another 0.1 seconds out at the end of the lap. Of course if the lap is -0.1 out at the start and +0.1 out at the end, for example, then it would be spot on.
The internal iPhone GPS works at 1 Hz so it's potentially 2 seconds a lap out! The GPS position is also quite poor without an external GPS unit and without accurate GPS positioning you're not even timing to the same point you started from.
If the sample rate is 10hz and assuming GPS position is 100% accurate (it isn't) then it could be 0.1 seconds out at the start of the lap and another 0.1 seconds out at the end of the lap. Of course if the lap is -0.1 out at the start and +0.1 out at the end, for example, then it would be spot on.
The internal iPhone GPS works at 1 Hz so it's potentially 2 seconds a lap out! The GPS position is also quite poor without an external GPS unit and without accurate GPS positioning you're not even timing to the same point you started from.
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