Roasting Regulators and Arduino Anomalies
There are a myriad different regulators on Arduino Pro Minis - watch out, they have different current ratings.
Adafruit's INA219 Arduino library has some confusing variable names - I try to make sense of it.
http://www.ti.com/lit/ds/symlink/lm2936.pdf
http://www.farnell.com/datasheets/29605.pdf
http://www.ti.com/lit/ds/symlink/ina219.pdf