I’ve upgraded my code for the stretch sensor graph in Processing. The sensor
outputs numbers. When I breath in or out the number gets lower. Detecting
breathing activity isn’t as easy as looking for a numbers below 200 for
example. Because over the time of wearing the sensor the whole range of
numbers starts to shift going either up or down. What remains is the sharp
decrease when breathing in. So now I’m comparing two averages of 5 rounds of
serial port activity each. When their difference is over 107% I know I’m
breathing in.