From other posts I understood I can install a resistor to the GND, and meaure the change in voltage across to achieve this. I bought the LM339 to try this option but how to wire it exactly what base voltage to use? Option 1: An external comparator: so I can compare the voltage over the resistor to a base voltage.I know there are several ways to translate this to a digital high low, but I do not know how to wire exactly, and what filters I must use to pre-proces the signal.
Option 2: The Arduino internal comparator. HOW TO WIRE ADAFRUIT TRINKET 5V GUIDE HOW TO. This includes collaboration with Adafruit Industries on their popular Trinket microcontroller. He rekindled his electronics and microcontroller interests, authoring a number of popular articles on using Arduino-compatible systems. An avid electronics enthusiast, he has worked on computers since the introduction of the PC. He has traveled the world, living in a number of countries providing security to American Embassies. A graduate of both Whitman College and the California Institute of Technology in Electrical Engineering, he has worked at Hewlett-Packard, the NASA Jet Propulsion Laboratory, and Boeing. Mike Barelais a Senior Foreign Service Officer with the US Department of State. A clock that displays time on analog meter. The Reactive Toy Animal, which moves and makes sounds. A personal audio player you program yourself. Kaleidoscope Goggles to dazzle onlookers. Electronic jewelry like a flashing Space Invaders pendant. An LED Color Organ that changes patterns to music. 
Illuminated projects with Adafruit s NeoPixel smart colorful LEDs.Written by a member of Adafruit s tutorial team, Getting started with Adafruit Trinket provides a jump start into using Trinket and offers great projects to inspire your own creations.
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