Platform perils 13. April 2014 Peter Fidelman Project Log (0) Week2 did not end smoothly, as our MegaMiniR4 died under mysterious circumstances before we could collect enough data to validate our project idea. Because of the extremely bad timing (and because the MegaMini's untimely death was likely my fault), I put together a new test board.This is an Arduino Uno R3 with BMA180 accelerometer. Same idea as the MegaMini, except considerably less sexy because it's breadboarded instead of using a custom PCB. I repurposed the parts from a prior project.Bulky, but it is indeed wearable.Experimentation shows that leg angle is an extremely accurate measure of standing. Even dancing, or sitting cross-legged, can't fool it. A simple IIR filter applied to the calculated tilt is sufficient to mitigate sensor noise (and spiky events such as footsteps). The process is simple enough that sitting vs. standing detection runs onboard the Arduino itself.As a proof-of-concept, here's 20 minutes of me being a couch potato. Whenever I get up for drinks, you can see the tilt of my upper leg shift to vertical, and my footsteps look like a minor earthquake. I get up and walk around 3 times for a total of about 3 1/2 minutes. Can you spot them all?