On Tue, Aug 23, 2011 at 6:39 AM, Tom Parker <[email protected]> wrote: > On Mon, 2011-08-22 at 07:08 -0400, Walter Bender wrote: > >> Turtle Art v 114 has an accelerometer block in the sensor palette that >> should appear on 1.75 machines. Maybe you could play with it? (It >> pushes X, Y, Z values to the stack: you retrieve them with 3 >> consecutive 'pop' blocks (found on the palette with the gear). > > Nice! I made a simple "position the turtle based on accelerometer x and > y" and found the sensor to be quite noisy. Averaging 5 values seemed to > be a lot better but was quite slow. I'm not sure if the problem was my > average code (a loop adding each value to a box and discarding z into a > comment (what happens if you overflow the stack?)) or the sensor itself > is slow to respond. > > I am getting perhaps 5Hz averaging 5 values and using setxy to position > the turtle. I get much more than that without the averaging. > > (I tried overflowing the stack, and didn't manage to do it, but at 5Hz, > it might take a while) > >
In my tests, averaging 4 samples seemed to be enough for a relatively noise-free experience. If you hide the blocks, Turtle Art runs faster, fast enough to make the experience reasonable. -walter -- Walter Bender Sugar Labs http://www.sugarlabs.org _______________________________________________ Testing mailing list [email protected] http://lists.laptop.org/listinfo/testing
