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-   -   [Maemo 5] n900Fly - An irresponsible app for the n900 (https://talk.maemo.org/showthread.php?t=36312)

cpscotti 2009-12-15 15:40
Re: n900Fly - An irresponsible app for the n900
 
Quote:
Originally Posted by markusm (Post 429092)
Add a feature to upload your results to an online server and show the user's current standing... :)

Any possibility to measure the 'hardness' of landing? A hard landing would be interpreted as a failed catch and generate extra dumbass points :)
About the server, I thought about it but since it's totally open source, it would take 5 minutes to receive a 376294km entry from some funny guy!... Unless we had some sort of compiled version with crypto.. and even then.. someone...

Now. about measuring the 'hardness' of landing, it is totally plausible! I also had that idea.. but well.. maybe for v.2...
Another things in mind are:
  • "Sweet mode" where it only counts if the phone lands on the same direction it was before taking off
  • Check if there was acceleration to generate the flight in order to make life of skydivers a little bit harder
  • ...

STE 2009-12-15 15:53
Re: n900Fly - An irresponsible app for the n900
 
Quote:
Originally Posted by cpscotti (Post 417157)
Welll... the accelero picks up acceleration, not velocity. Ideally acceleration is zero through the whole "journey". Since the accelerometer is inside (and fixed to) a heavier body it in fact suffers "accelerations" from within the phone itself (like when it is spinning) but that is very noisy...
Comming back to the acceleration thing. Assuming that the phone does not rotate, why should be the acceleration constant to zero? I think RDJEHV was right. It is the rate of change of the velocity. If you throw your phone straight into the air, it gets slower and slower, until it reaches its highest point. There the acceleration should be zero, i.e. for a moment the phone is weightless. That is precisely what happens during a parabolic flight http://www.experiencezerog.com/parabolic.cfm

Edit:
Nevermind, you are right. The acceleration should be constant to 1G, correct? I think I got confused

ste

Rob1n 2009-12-15 16:02
Re: n900Fly - An irresponsible app for the n900
 
Quote:
Originally Posted by STE (Post 429125)
Comming back to the acceleration thing. Assuming that the phone does not rotate, why should be the acceleration constant to zero? I think RDJEHV was right. It is the rate of change of the velocity. If you throw your phone straight into the air, it gets slower and slower, until it reaches its highest point. There the acceleration should be zero, i.e. for a moment the phone is weightless. That is precisely what happens during a parabolic flight http://www.experiencezerog.com/parabolic.cfm
Umm, no. The acceleration will be constant - 1G. What other force is acting on the phone in mid air? A parabolic flight doesn't actually experience zero-gee, it just feels like it - the plane is actually accelerating downwards at 1G.

cpscotti 2009-12-15 16:13
Re: n900Fly - An irresponsible app for the n900
 
Quote:
Originally Posted by Rob1n (Post 429141)
Umm, no. The acceleration will be constant - 1G. What other force is acting on the phone in mid air? A parabolic flight doesn't actually experience zero-gee, it just feels like it - the plane is actually accelerating downwards at 1G.
Well.. you should all try accDisplay since physics are not helping. The reason why the phone's accel. readings are all zero (and not 1g) is because all the phone parts (including the accelerometer's internals) are (de)accelerating equally. Accelerometers measure acceleration differences relating to "free-fall".
Wikipedia might help

For example, the ISS "feels like" zero G (and indeed a accelerometer there will read 0) only because it's indefinitely falling towards earth: orbiting.

Well.. we could go on explaining and giving lot's of examples but really... wikipedia sometimes help.

I really suggest that you (the ones that are still getting how accelerometers work) install accDisplay (extras-testing). With this tool you can "record" the accelerometer's readings and playback slowly and really see what happens.

conny 2009-12-15 19:27
Re: n900Fly - An irresponsible app for the n900
 
Maybe those guys will adapt it for a new discipline. Height instead of distance :D

mikec 2009-12-15 19:32
Re: n900Fly - An irresponsible app for the n900
 
With all this accelerometer action there seems to be a missing feature PORTRAIT MODE

bonerp 2009-12-15 20:02
Re: n900Fly - An irresponsible app for the n900
 
sorry am I the only one who thinks its not really appropriate for this type of language on an app???

Jack6428 2009-12-15 20:07
Re: n900Fly - An irresponsible app for the n900
 
Cool idea. I hope you make it a success. It's funny, i like funny.

I wonder...what if the N900 was shot up into space? Would it come back? And what about the height lol?

Try thinking about making a reverse app - when you drop the phone from a cliff to check how deep it is.

daperl 2009-12-15 20:35
Re: n900Fly - An irresponsible app for the n900
 
Add video recording to this app and then put the n900 in a bubble.

Weeee!

Bytales 2009-12-15 23:02
Re: n900Fly - An irresponsible app for the n900
 
Well, at the top of the flight, the acceleration is zero. If there is a way you can detect this with the accelerometer on the phone, that would be the moment to take the picture.
I don't know how the accelerometers work on the n900, but that's the main idea.

Original Poster, if you are here to make apps for the N900, here is my first idea. Hope you like it.
http://talk.maemo.org/showthread.php...823#post427823


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