[Flux Axiom] is using an Arduino Mega in his setup along with a cornucopia of sensors and all their data is being logged onto an SD card. All the code used in his setup is available in his GitHub ...

Wouldn’t it be great is you could also use the ’16u2 on the Uno or Mega for some additional functionality to your Arduino sketch ... the addition of extra sensors or LEDs, and anything ...

Some work by sensing sound ... one you are using so you can write the code accordingly. PIR Pin “out” connects to Arduino Digital 2 Here is the Arduino code for the Parallax sensor int ...