The New Technology Foundation have announced the dates of the 32nd All Japan Micromouse Tournament. The event will be held in Tsukuba on Friday 18th November 2011 to Sunday 20th November 2011. Full details on the NTF web site.
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Peter, in looking at the second and third figure, I think what you are saying is that scale the data that was used in the second figure by a ln(ADC50) value.
Given this, I don’t get why the curves in the third figure overlap. Esp. considering the vertical axis on the third figure has a larger range/span than that in the second figure.
If it is this clean, I should just do this!
The second figure is mis-labelled. The vertical scale is 100/ln(ADC) not 1/ln(ADC). I will try and remember to fix it in the morning. That 100 value is a bit of a red herring. It might have been better if I did plot 1/ln(ADC) just to show the linearisation. Anyway, the different brightnesses result in different slopes.
In the last figure, all that happens is that the scale is adjusted so that they all pass through the (50,100) point. Since the slopes are slightly different, the lines will overlap.
This is, of course, all calculated for demonstration although the original ‘standard’ brightness data is real. I then multiplied that value by 0.75 for a dark wall and 1.25 for a bright wall.
Thank you for clarifying/re-enforcing the point about calibration by scaling the different curves through one point. That will certainly perform the normalization you are refering to.
Hi. I have a question. There’s no other way to measure the distance? I mean som phase offset method? Fire an LED with pulses, then compare with the reference an the time offset between two is the fly distance of the light? I know it’s possible, but don’t know how it’s work exactly or if it’s possible in small scale usable on micromouse.
Although there are many ways to measure wall distance, none are as easy to use or implement as this. Only one offers any significant benefit I would say and that is optical triangulation sensors. these work in the same way as the common Sharp distance measuring sensors but with better performance. Ther are mechanically more difficult to make and electrically much more complex. they do, however, offer millimeter accurate distance measurements independent of wall reflectivity.