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SubjectRe: [ltp] IBM HDAPS Someone interested? (Userspace accelerometer viewer)
On Sun, 3 Jul 2005, Alejandro Bonilla wrote:
> PLEASE read the following article, it has the data of a guy that made a
> driver in IBM for Linux and he described the driver he made.

Yesterday evening, I used my time here at Debconf5 constructively! ;-) (43kB) (27kB)

The sensor gives us two 10-bit AD values (corresponding to 0..1 volts on the
ADI chip), temperature (Celsius) and three status bits indicating:

* lid open/closed
* keyboard activity
* nipple movement

On the X40 I borrowed (thanks Robert McQueen), at rest the outputs hover
around 512 (0x200). Gravity is supposed to fall off in a sine-wave during
rotation, but I found that:

theta = (N - 512) * 0.5

provides a surprisingly good approximation for pitch/roll values in degrees
in the range (-90..+90) so I think the sensor can do ~= +/-2.5G . (9kB)


PS. Coincidently, the name of the machine I borrowed is 'theta'...
Mostly it snows here. Helsinki, FI

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