Friday, 18 of April of 2014

New Arduino Library: INA219 i2c Current/Power Monitor

I’m happy to announce a new Arduino library –  my first ever — for the TI INA219 current/power monitor chip. This is a neat little chip that has an isolated shunt voltage amplifier tied to a 12-bit delta-sigma converter. It has on-board oversampling (up to 128 samples) and is addressable over I²C. The I²C is handled by the Arduino Wire library.

The INA219 can provide the four main figures of interest for a DC bus: shunt voltage, bus voltage, load current and power. Note that it will not work with AC — it cannot calculate RMS values, or account for lead/lag phasing due to reactive loads — but it’s still super handy for monitoring the power consumption of circuits with DC rails.

You can download the library and an example sketch over on GitHub.

Happy current sensing!

 


Comments RSS TrackBack 9 comments