http://www.androidzoom.com/android_applications/productivity/aircraft-horizon_zcuz.html

 Robin Bergland.

 That would be worth buying a small Android tab just for that.

 http://www.everbuying.com/smlclass854.html?gclid=CJr9qfbE7awCFUWMtgodigzI9A

 Paul Lamar


 I know many phones and tablets can sense which way is down to
 determine portrait or landscape orientation of the display but that
 is a single axis sensor.  How does he get roll AND pitch?  i am
suspicious!

 SD

 I suspect the sensors are 3 axis.

 There is an ap out there where you can look at the night sky and identify
 star names by merely tilting the tab back and fourth pointing it in
 the direction of interest. It also uses the GPS to locate one on the
 planet.

 Paul Lamar



It can do all of that stuff with just 3-axis accel, compass, and GPS. To
get "real" horizon info and not just a toy that works while you're standing
on earth, you need a gyro. I believe some phones may have a MEMS gyro, but
that software only claims to use the accelerometer, which is a flawed
method.

-Chris W

It sure keeps my toy helicopter flying straight.
A lot depends on the A to D used. A 16 bit A to D is one part in
65,000 more or less. In terms of percentage that is .0000153% I think.

Having said that I don't know what the A to D is but 12 bits are very
common and cheap. One part in 4096 or .000244%.  Modern CPU chips found in
desk tops and tabs have enormous computing power.


Paul Lamar

Your toy helicopter uses a gyro and not an accelerometer, as far as I know.
At least my toy helicopter does. :)

-Chris Wood

What is the difference?

Paul Lamar