9th Sep 2007

After weeks of testing, and many different programs testing, the problem previous I had in which the timer returns a negative values is because of the printf type for long in CCS is supposed to be %lu instead of %ld.

Taking the t1 and t2:
at the beginning(10s after heating starts): t1=8.91 t2=17.11ms temp=26.7
completely changed color: t1=8.92ms, t2=17.65ms(which are very close to the values by timers 22302, 44094) temp=32.84

after quantitative tests, when placing the temperature sensor at the corner of the pixel, the feedback from temperature sensor when the color is completely changed t1=8.93, t2=17.65, temp = 32.62.

Now the system starts to work properly already together with the bluetooth module. The next step of work is to find out which type of material used for color changing would be preferred by the users. We could either choose to use LEDs or thermochromic ink in the end.

Currently, the LEDs are in the process of ordering, so we have to test out the thermochromic ink property. Previous idea of sewing the yarns onto the each element doesn't really turn out to be good, as the way to sew the yarn in order for a faster heat distribution on the element will expose the yarn outside the element which is not esthetic. Therefore, there are two ways I could think of so far, one is to sew the yarn on another piece of material, and stick the two elements together; the other way is to still sew the yarn on the element itself but try not to show as much yarn as possible on from the front. Either method will have to be determined by the users which is better from their perspective.

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