Datasheet

Wiring

The INA219 breakout board can be powered by the 5v pin on your Arduino and communicates via I2C.

Connect to the microprocessor

Connect GND to GND

Connect VCC to 5v

Then connect SDA to SDA (Analog pin 4 on pre-R3 Arduinos)

And connect SCL to SCL (Analog pin 5 on pre-R3 Arduinos)

On R3 and later Arduinos, you can connect to the new dedicated SDA & SCL pins next to the AREF pin. On pre-R3

Megas, SDA & SCL are on pins 20 & 21.