send serial only when active?

    Nov 27 2012 | 12:42 pm
    and to cover all the bases, I'm selfishly asking here too. I'm in the process of optimizing a Max/Arduino tool which features 18 FSRs and 18 LEDs, kind of a DIY QuNeo/Monome thing. My simple question is this: how can I ensure that the Arduino is sending serial data only when the sensors are active, >0., or changing. Is it simply a matter of:
    if (myVar>0.){ Serial.write(myVar); } else{ //do nothing }
    I'll go off and have a wee noodle with my code now anyway and see what happens, Cheers

    • Nov 27 2012 | 2:15 pm
      yeah, that's not gonna do it. It works, but unreliably, mainly as I'm using diy sensors.
      how would I write a delta function in Arduino? Read sensor; read again, subtract current from previous; if delta >myThreshold then send, else flush and do nothing.
      Said as much on the Duino forum too
    • Nov 27 2012 | 2:44 pm
      Success, as follows IAI (my own new acronym: "if anyone's interested"):
      int currVal; int prevVal; int delta;
      void loop(){ currVal=analogRead(0); delta=currVal-prevVal; prevVal=currVal; }
      there's other stuff going one, but not relevant to delta acquisition.
      Once again, apologies for the [noise~]