In the first article, we gave an overview of Hailo’s power measurement solution. In the second article, we attempted to reproduce these power measurements with the ElmorLabs solution.Series: Edge AI Power BenchmarkingIn this article, we repeat the same experiment, this time by prototyping a custom INA circuit with available components from Adafruit.Essential Components from AdafruitAfter further investigation, I discovered that Adafruit has several flavors of INA circuit boards, in addition to a USB to I2C board. These components interoperate together to offer a working power measurement solution out of the box.
We will be combining this with the ElmorLabs PCIe power insertion adapter, which exposes the 3V3 rail as a jumper, which we can easily tap into.Assembling the SystemThis solution was significantly easier to set up.The FT232H breakout had a single switch to set for use with I2C:I2C Mode : set to ONRegarding the INA228 module, contrary to what I was expecting, no soldering was required to configure the board. The FT232H breakout and INA228 module were connected with a STEMMA QT cable.I adapted a 2 wire power cable I had, and exposed one of the ends to connect up to the INA228 module. I also wired the +V terminal to the Vbus, for use in High-Side mode (i.e. measuring the 3.3V rail, instead of ground)
