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• Porting to MicroPython

  Chris • 05/17/2017 at 07:43 • 0 comments

  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.

• Automatic Gain and Current Overflow Detection

  Chris • 03/02/2017 at 07:43 • 0 comments

  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()

• Recommended upgrade to fix invalid current and power readings

  Chris • 02/21/2017 at 07:17 • 0 comments

  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
  

• Unit Test Code Coverage

  Chris • 02/18/2017 at 09:29 • 0 comments

  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:

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