Power logger with Raspberry Pi

Built a simple circuit for testing. 4.7K resistor with known voltage

3.26V / 4700 Ohm = 7e-4 A = 0.7 mA

That what I see at the graph. So I can trust to measurements. Still some deviations here. Around 0.1 mA.

Measuring. X-axis is in milliseconds

Current going to negative values also. Very strange.

Useful libraries:

Python library for INA219

https://github.com/chrisb2/pi_ina219

I will share my code soon

Using case and extension board from my old project. Extension board has i2c output. Connected INA219. Now it's time for coding