Using iPhone as a trackday in-car camera

[RossP]

I was going to use my iPhone 5 as an in-car camera on a recent Javelin trackday, but they were quite clear in stating 'no suction mounts'.

Does anyone know of a suitable mount that can be used with a phone for trackdays?

[Manicminer]

Some good info on this thread from a few months back

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Do you have a roll cage to mount it to?

[paulm3]

I used my iphone5 as in car camera at Donnington the other week...
vid here - https://www.youtube.com/watch?v=nvMM_o12EyE

i used one of these to stick it to window and angle it about etc...
http://www.ebay.co.uk/itm/160900346466?ssPageName=...

Thought it worked quite well as a cheap but HD(ish?) set up

Edited by paulm3 on Thursday 3rd January 13:28

[RossP]

Thanks - that thread looks interesting. No roll cage I am afraid.

From starting to read that thread it seems suction mounts are allowed at Bedford which is where I am going next! So just need to find a nice rigid suction mount.

[iPlod999]

If you do use your iPhone. Download the Witness App.

69p and it shows your speed.

http://i1164.photobucket.com/albums/q577/iPlod999/...

[RossP]

paulm3 said:

I used my iphone5 as in car camera at Donnington the other week...
vid here - https://www.youtube.com/watch?v=nvMM_o12EyE

i used one of these to stick it to window and angle it about etc...
http://www.ebay.co.uk/itm/160900346466?ssPageName=...

Thought it worked quite well as a cheap but HD(ish?) set up

Edited by paulm3 on Thursday 3rd January 13:28

OK - I've ordered one of them to have a play with as it's only £3.99!

[shim]

Loskey said:

Make sure you have harrys lap timer too. It's a great app for track days

Yep apart from the crap GPS making it about as accurate as an egg timer.

[Buff Mchugelarge]

paulm3 said:

I used my iphone5 as in car camera at Donnington the other week...
vid here - https://www.youtube.com/watch?v=nvMM_o12EyE

i used one of these to stick it to window and angle it about etc...
http://www.ebay.co.uk/itm/160900346466?ssPageName=...

Thought it worked quite well as a cheap but HD(ish?) set up

Thats really good quality and great sound too.
Going to have to have a play with mine

[Woody67]

Nice quality video from the iPhone great tips cheers chaps

[GC8]

Loskey said:

I do admit that the standard GPS reciever in the iPhone isn't the best being only 1hz but its perfectly adequate for basic lap times.

Thats two seconds per lap though... I can guess to within a second a lap.

[VTECMatt]

Recommendations for external GPS receiver please?

Instructions in what to do with it would be helpful for an IT numptie. Im guessing you need to power the God phone when using.

TIA

Matt

[g40steve]

Just ordered one to try.

My mate uses his iPhone in his r26r with good results, so thought lets try it.

[AJay539]

I saw this this called Clickdrive: http://www.indiegogo.com/projects/clickdrive-all-y...

Look promising for integration with trackday. Recorder, HUD, overlays and performance reviewing. Dunno though, might take some time to gain traction.

[upsidedownmark]

GC8 said:

Thats two seconds per lap though... I can guess to within a second a lap.

Actually, it's not quite as bad as that. If I was a developer, here's how I'd do it:

1) Know where the 'finish line' is
2) Take the position before the line, the position after the line, measure the distance between the two.
3) figure out where on that line the finish line was crossed
4) split the time between the two fixes proportionally according to the result from 3) i.e. if the line was half way between the fixes, add 1/2 a sec to the time of the pre-line fix.
5) Job jobbed.

I'm not the smartest dev in the world, but that's pretty straightforward. Now it's not perfect as it doesn't account for acceleration, but you could get more sophisticated. Frankly I'd be more interested in positional error/jitter, and what the timing of the fixes is like. GPS update rate is helpful, particularly in drawing smoother curves and the like, but it's not necessarily all that.