Lap timers?

[touge_ae101]

yeah $&#$% spending big money on a GPS unit and everything. its my mate from uni who is developing this APP truenotch speaks of and it is going to be awesome and be able to measure G-forces generated through braking, cornering accl. etc.

at this stage it is going to be limited to iphone 3gs (not sure on other versions) and 4 due to the hardware they have making it easier/more accurate with its GPS locations etc. but it is a really awesome app, so much so that it makes me want to buy an iphone just to run this as my lap timer.

i will chuck something up once it gets a bit more developed cause it is only at the beta stage atm but still very impressive from what we saw on the weekend.

[toymato]

Once you get the PBox sorted and working great they are a good thing.

I'm going to spend some time playing with it on the track this weekend, and get it find out power-at-wheels and flywheel-power, as well as learn how to use it on track. Only used it point to point so far, which is a bit harder to set up.

[perfk]

Just hold your horses for a while. Do you have an iPhone?

of course (doesn't everyone?)
What sort of date are you looking at having it available for purchase, or is it too early to know yet?

[1I1]

Still in development so as Rhys said a little while away, so easily months away

[Truenotch]

It works perfectly fine now, but doesn't have all of the features yet. I'd be thinking that it will be more developed before the May playday at Manfeild.

[~SlideWays~]

Shame the Ipod touch doesn't have GPS.. I think.

[touge_ae101]

Just hold your horses for a while. Do you have an iPhone?

of course (doesn't everyone?)
What sort of date are you looking at having it available for purchase, or is it too early to know yet?

yeah i would say 1-2 months. it will blow the existing products out of the water. will be going back to hawkes bay where he lives and do a bit of testing for him while i'm back and should have it going properly by either the may playday at manfeild (not quite sure if i'm going to make it to this yet) or mid-may.

[pc]

Isn't the sample rate on an iphone 1Hz?
Useful accuracy will be impossible with such a low sample rate. Before getting too carried away with developing an iPhone app, I would take a good look at the competition.

[touge_ae101]

yeah he has done a lot of work on making sure the ways he samples/locates the GPS position is accurate by doing heaps of different things including triangulating off cell phone towers, using the accelerometers etc. it works really well and it was accurate enough to pick up that i started on the inside position on the grid and it mapped me taking a different line on my way round the next lap, but would have only been 1m or so from my original position.

and 1m at 180km/h = 0.02s = SFA difference

so will be very accurate.

have done quite a bit of research into current stuff available and it is going to be a lot easier to use and advanced than most of the stuff you can buy.

he is even working on a drift mode that will be able to measure drift angle for all the drifters out there.

[pc]

180KM/h @ 1Hz = 50M
Using the accelerometers could fill in the blanks though.

[ch4ng]

This sounds awesome man, out of interest how are you mounting the iphone?
Ive tried some of the other apps out there, and using the trademe windscreen suction mount it just wouldnt read my launches (for 0-400m)
It worked when i jammed it in the cup holder but thats very impractical.

[touge_ae101]

for testing we used a TomTom suction mount on the windscreen but have yet to test the start function. might be something we look into to make sure it is going to work. also need to talk to cogent and see what kind of mounts are available, for not a ridiculous price.

[cogent]

if you want good quality, stable, reliable mounts that won't break or fade over time, you're looking at about $85-$100. $130 investment to utilize a tool you already have (I don't assume many people will be shelling out for an iphone at nz prices just to use this app) is a pretty good deal when you consider the other options are at least $300 and rely on other infrastructure at the track. As a bonus you can use the mount for everyday driving as well.

[matt dunn]

180KM/h @ 1Hz = 50M
Using the accelerometers could fill in the blanks though.

1HZ is one sample per seond,
so will only be accurate to within a second.

Pbox is 10hz and so is only accurate to 1/10 second,
and if you are serious enough, even that isn't accutare enough.

Mylaps transponders are accurate to 1/1000th second.

[cogent]

I think the idea is that if you already have an iphone 4 or 3gs, for the price of less than a trip to the movies you can have your own laptimer which will give you "good enough" readings to tell you if you are being consistent, faster, slower etc and doesn't rely on anything other than a signal to the cellular network/a-GPS system.

[perfk]

if you want good quality, stable, reliable mounts that won't break or fade over time, you're looking at about $85-$100.

Care to send over a sample?

[pc]

180KM/h @ 1Hz = 50M
Using the accelerometers could fill in the blanks though.

1HZ is one sample per seond,
so will only be accurate to within a second.

Pbox is 10hz and so is only accurate to 1/10 second,
and if you are serious enough, even that isn't accutare enough.

Mylaps transponders are accurate to 1/1000th second.

It's not that inaccurate though, because if the box knows where you were 1/10s ago, and it knows where you are now, then simple math will be able to calculate with reasonable accuracy what time it was when you passed the start/finish point in between. They are a lot more accurate than 1/10s for lap times.

Transponders can only give lap times and/or splits. So no interesting data to analyse later.

[cogent]

hey guys, hopefully I will have an iphone4 and an iphone 3g/s suction mount for you to borrow shortly. With luck they will arrive from Aus before the playday next weekend at manfield. If Rhys or Markku is at the playday then just look for my RX7 and you should be able to collect the mount.

cheers!

[RobertC]

Was at puke yesterday. Put my cycling Garmin in the car to see how it went. It records data every second (so just gives you times accurate to a second or so)

Player of the data

Split times using the auto lap function. Which works by, on the first lap as you cross the start line you hit the lap button then it creates a new lap every time you pass the point

[touge_ae101]

hey guys, hopefully I will have an iphone4 and an iphone 3g/s suction mount for you to borrow shortly. With luck they will arrive from Aus before the playday next weekend at manfield. If Rhys or Markku is at the playday then just look for my RX7 and you should be able to collect the mount.

cheers!

Cheers nick! Yeah we will be there in some form of car no doubt and now have a iPhone go test it on. :p