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Hack Notes CVA 090324
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===Round 2=== *We added a second pager motor and had them ranging from 0% to about 70% of the max motor speed, with one vibrating fully at North and one vibrating fully at South. *It was very hard to distinguish which pager motor was vibrating, two theories for this: *#The ankle is not sensitive enough *#The velcro strap is too rigid and transmits too much vibration throughout the material *Further testing quickly revealed that: *#The behavior of the pager motors are not equal and as a pair are not acting as expected. *#Whoah something is crazy wrong with our circuits! *#Hooray! Turns out the little bin labeled "2N2222" transistors actually has 2N2222's in the front, but other, almost visually identical transistors in the back. We had one of each. / "Oh look, there are actually two labels!" / "BLAST!" *Dang. Now the two pager motors are clearly differentiable. **The Moral: Always debug your circuits and learn to read labels. *Now that the right transistors are driving both motors we see: *#The ankle is sensitive and perfectly capable of differentiating which vibrator is on *#So, the velcro strap is not transmiting so much vibration as to be confusing. *#But, when the motors are both on and running somewhere in the middle of the range of speeds (as in when pointing Eastwardish or Westwardish) it's practically impossible to tell which one is running faster. *#Having one vibrator on the shin and one and the back tendon is less sensitive than positioning both on the left and right of the ankle (I think the muscle jiggles more). [[Image:Anklethack-7.jpg]]
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