Datasheet

Next you'll need to install the necessary libraries to use the hardware--carefully follow the steps to find and install these

libraries from Adafruit's CircuitPython library bundle (https://adafru.it/zdx). For example the Circuit Playground Express

guide has a great page on how to install the library bundle (https://adafru.it/ABU) for both express and non-express

boards.

Remember for non-express boards like the Trinket M0, Gemma M0, and Feather/Metro M0 basic you'll need to

manually install the necessary libraries from the bundle:

adafruit_ina219.mpy

adafruit_bus_device

Before continuing make sure your board's lib folder or root filesystem has

the adafruit_ina219.mpy, and adafruit_bus_device files and folders copied over.

Next connect to the board's serial REPL (https://adafru.it/Awz) so you are at the CircuitPython >>> prompt.

Python Installation of INA219 Library

You'll need to install the Adafruit_Blinka library that provides the CircuitPython support in Python. This may also

require enabling I2C on your platform and verifying you are running Python 3. Since each platform is a little different,

and Linux changes often, please visit the CircuitPython on Linux guide to get your computer

ready (https://adafru.it/BSN)!

Once that's done, from your command line run the following command:

sudo pip3 install adafruit-circuitpython-ina219

If your default Python is version 3 you may need to run 'pip' instead. Just make sure you aren't trying to use

CircuitPython on Python 2.x, it isn't supported!

CircuitPython & Python Usage

To demonstrate the usage of the sensor we'll initialize it and read the current and more from the board's Python REPL.

Run the following code to import the necessary modules and initialize the I2C connection with the sensor:

Now you're ready to read values from the sensor using any of these functions:

shunt_voltage - The shunt voltage in volts.

bus_voltage - The bus voltage in volts.

current - The current in milliamps.

import board

import busio

import adafruit_ina219

i2c = busio.I2C(board.SCL, board.SDA)

sensor = adafruit_ina219.INA219(i2c)

print("Bus Voltage: {} V".format(ina219.bus_voltage))

print("Shunt Voltage: {} mV".format(ina219.shunt_voltage / 1000))

print("Current: {} mA".format(ina219.current))