nitram38
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 posted on 21/11/10 at 02:39 PM |
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Harry's lap timer for iphone. NTDWM
Following on from Racechrono post
Just downloaded the iphone app. Looks really good.
Just need a trackday to test it out!
Produces accelerometer G readings and lap times via gps.
Circuit overlays can be created by you or downloaded for free.
Downloads Include uk circuits as well as European and Worlwide. eg Brands Indy, Brands GP, Cadwell, Bedford Areodrome
The video option can then be combined with the overlays to give you laptimes, position etc.
I bought the app with addons like the video, speedo options. Cost £13 in total or you can buy the basic £3,49 one and add the other options as you
go.
Sample video here
Website here
You can also watch via live server access, plus lots more cool features
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prawnabie
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| posted on 21/11/10 at 03:15 PM |
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I used this last year at the nurburgring. It was ok but would be alot better if the gps receiver in the iPhone works at a faster speed.
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nitram38
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| posted on 21/11/10 at 03:25 PM |
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quote:
Originally posted by prawnabie
I used this last year at the nurburgring. It was ok but would be alot better if the gps receiver in the iPhone works at a faster speed.
Did you use a seperate mount like the tom tom inside the car?
I know my sat nav is pants in my tintop without one.
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prawnabie
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| posted on 21/11/10 at 03:30 PM |
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I have got the tom tom mount, but its for the 3G and haven't tried it to see if the 4 fits in it yet.
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andylancaster3000
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| posted on 21/11/10 at 04:56 PM |
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Question re. the accelerometers...
Do you need to mount the phone horizontally? I've just downloaded trackmaster onto my HTC which I've had a quick play with but as far as I
can see it you'd need to mount it dead flat and inline with travel to get usable readings or am I missing something?
Andy
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StrikerChris
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| posted on 21/11/10 at 04:59 PM |
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I've got some speedometer app for free on htc which sounds similar.worked ok on Friday and could even see the detour into the gravel trap on the
map it plotted!some of the speeds were little ambitious tho,think it must of been the gps looking signal,spiked to 153mph around the hairpin at Oulton
park!
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RazMan
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| posted on 21/11/10 at 06:15 PM |
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Android users might want to check out
http://www.androidzoom.com/android_applications/sports/trackmaster_mzd.html
Trackmaster is a racing lap timer that works great for autocross, hillclimbs, rally, and track days!
•Lap & Split Times
•Lap Graphs
•Street & Satellite View
•G-Meter
•Speech Enabled
•Bluetooth GPS
•Google Earth,MSExcel
•Twitter,Facebook
•Background Mode
not a free app but looks rather good with just about every feature you could wish for .... and then there are add-ons too! 
[Edited on 21-11-10 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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MK9R
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| posted on 21/11/10 at 09:08 PM |
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The biggest trouble with using any of these is the sample rate of the GPS and accelerometers, they simply aren't fast enough to create
meaningful data or timing. OK for a nice visual overlay, but as a performance aid its just not accurate enough. You need a minimum of a 5hz (every
0.2s) ideally 10hz gps receiver
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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Howard Smith
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| posted on 30/11/11 at 01:57 PM |
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Harry's lap time is capable of using certain external GPS sensors to give higher data rates. Further support will be added in V15. I have the
Dual XGPS150 which Lap Timer uses the NMEA stream for better results than the iphone GPS. The XGPS will be supported in v15 to 5 Hz.
Harry has posted a video of the next version, v15, which is due in the spring.
Here:
http://www.youtube.com/watch?v=6pGHaxUw3UA
In the UK I don't use the lap timer to video record, but I have the external GPS sensor velcro'd to the dash and the iphone in the
glovebox out of sight, so I cannot be accused of timing.
Harry's website is here:
http://gps-laptimer.de/Home.html
he has some useful information on GPS NMEA streams and update rates.
I have no ties to Harry apart from being a satisfied user.
h
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