Raspberry Pi INA219 voltage/current sensor library

I am working on porting this library to MicroPython on the pyboard. Currently the functionality is working correctly based on manual testing and I am looking to port the unit tests.

Take a look at the project here.

Version 1.1.0 of the INA219 library is now available with three major enhancements:

• Support for automatic gain adjustment, this makes getting valid readings over the full current/power range of the device very easy. Automatic gain is the default mode.

• The calibration calculation has been altered so that current overflow conditions are always detected so its no longer possible to obtain invalid current, power or shunt voltage readings.

• This version (v1.1.0) of the library is available in the PyPI Python Package Index (https://pypi.python.org/pypi/pi-ina219), which allows a more standard installation process.

At its simplest the following code is all thats required to get readings for the full supported current/power range of the device. See the README for further details.

#!/usr/bin/env python
from ina219 import INA219
from ina219 import DeviceRangeError
SHUNT_OHMS = 0.1


def read():
   ina = INA219(SHUNT_OHMS)
   ina.configure()
   print "Bus Voltage: %.3f V" % ina.voltage()
   try:
       print "Bus Current: %.3f mA" % ina.current()
       print "Power: %.3f mW" % ina.power()
       print "Shunt voltage: %.3f mV" % ina.shunt_voltage()
   except DeviceRangeError as e:
       # Current out of device range with specified shunt resister
       print e


if __name__ == "__main__":
   read()

If you are currently using this library I recommend you upgrade to v1.0.3 which fixes an issue with invalid current and power readings if low values of max expected amps are specified (Issue #4).

To see what version you currently have execute:

pip show pi-ina219

To upgrade simply execute:

sudo pip install git+git://github.com/chrisb2/pi_ina219.git

I have updated the Travis CI configuration to automatically created a code coverage report on every build and upload it to 'codecov', see https://codecov.io/gh/chrisb2/pi_ina219. The code coverage is currently 97.7%.

I have added 'badges' showing the build status and code coverage to the README: