[request] 0-60MPH timer app

Former Member over 10 years ago

I was curious if it would be possible to build a 0-60MPH timer?

this would obviously be used for testing the 0-60MPH time in a car or truck.

maybe something like when you open the app, once you hit 0MPH, the watch flashes green that it is ready, then the driver would accelerate. this would start the timer. once the vehicle reaches 60MPH, the timer would stop and then the watch would display the 0-60MPH time.

Thanks!!

Former Member over 10 years ago

It would be easy, but I'm not sure how accurate it would be. Would you like someone to code it up?

Sure...if it is not too difficult. I could test it against my actual 0-60 time.

travis.vitek over 10 years ago

It would be easy, but I'm not sure how accurate it would be. If position updates come in every second, you might not know that the car has moved for an entire second. If we're talking about a car that goes 0-60 in less than 4 seconds, this discrepancy might be an issue.

Would you like someone to code it up?

travis.vitek over 10 years ago

I'm fairly certain I could do it tonight.

Former Member over 10 years ago

Awesome!! I look forward to testing it.

Former Member over 10 years ago

Speed reported from GPS only updates approximately once per second, so I don't believe it will provide sufficient data resolution for this type of application.

You might be able to interpolate speeds, but that would be a much more difficult application to develop.

Former Member over 10 years ago

yeah...if one second is the best it can do...then it may not be very useful because as you point out...1 second can make a huge difference.

Sforzando over 10 years ago

Taking the integral of acceleration over time while using GPS to anchor new initial conditions each second might be a good solution, assuming accelerometer data becomes available in the API at some point and provides a sufficient sample rate (see https://forums.garmin.com/showthread.php?163853-Accelerometer-Data&highlight=accelerometer).

I tend to agree with Brian.ConnectIQ that 1Hz GPS alone may produce lackluster results; even with interpolation you would need to make some assumptions about the rate of change of acceleration. Given near constant acceleration during the final second before 60 you could get close, but you might have to stay on the gas for up to an extra second until the next GPS fix. Still sounds like fun - I drive a 2011 5.0 V8 Mustang so I can definitely see where you're coming from!