With two different SonyEricsson K800i, and two different bluetooth dongles, it shows always negative distances:
-12 at 50cm, -7 at 1m, and so on...
The min/max data indicates: min:-31 max:255
This is the Hardy (1.2.4 version). Please, order me any other data you need.
Thanks.
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This is kind of strange but still possible. On my original setup the rssi value that is measured only leaves negative values. I looked at several other systems and found that to be true on those too. So I decided to make very simple calculation formula, which is distance = -rssi value...
you could change that in the source if you want to... the formula should then read distance = 31 - rssi.
I don't believe there could be a general fix for this. Maybe there could be a corrective shift factor in the settings...
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Well, to modify sources is not inside my todo list ;-)
But it would be a good idea to add a correction rate to the configuration settings. 8-)
I'm also asking for a "distance skew" feature. I'm getting "zero distance" readings through an office wall, and negative readings when I put the device right next to the receiver (a Lenovo R60 notebook in my case).
So in order to set up accurate unlock parameters I would have to be able to either (a) set negative values or (b) normalize the distance values to "my own" zero.
I suggest to introduce a feature similar to the "reset min/max" button, which would not only reset the recorded readings, but also normalize the scale to the lowest received distance value (for example, if the recorded minimum is "-10", clicking that button would set the new zero to "-10", putting a 10 point skew to the value).
Or simply make it configurable with a text input field.