LilyPad e il filo... conduttore... e pure resistente!

clipped from web.media.mit.edu Unfortunately, the problem is actually worse than it first appears. Silver thread gradually corrodes over time and its resistance gradually increases as it ages. You want to plan for this by keeping the resistance of these crucial power supply traces as low as possible when you first construct your design. For example, if your LilyPad is only getting 3.6 Volts initially, you're probably going to have problems in a few months. clipped from web.media.mit.edu

In poche parole: il tessuto conduttore ha una resistenza atroce (14 ohm/foot, cioè qualcosa come quasi 46 ohm per metro!).

Dato che la LilyPad assorbe fino a 50mA, se la batteria è lontana solo una trentina di centimetri dall'apparecchio va a finire che la tensione cala di 50 mA x (14+14) ohm = 1.4V (mica briciole!)