- Expand the .zip file to the Libraries folder in your Arduino Sketchbook folder (If you don't know where this is, open File->Preferences in the IDE and it will tell you the location of your sketchbook folder).
- Rename the folder to Adafruit_INA219
- Close all instances of the IDE, then re-open one, so that the IDE will recognize the new library.
The "getcurrent" example code should open in a new IDE window.
Click on the upload button in the IDE. When it is "done uploading"
Open your Serial Monitor and set the speed to 115200 baud.