Very small noise when measuring small current with ADS1115

[kittsulan]

@Wawa
I bought the one made by Adafruit. #26 and after, the results of using it. The noise problem arises in the same way.

@SteveThackery @TomGeorge
You are right. The use of commercial products and amplifiers is very interesting (Tom, thanks for sharing the video! I'll check it out!) ), but what I'm interested in is,

@kittsulan

why noise is generated and how to handle it analogically, out of personal interest to better understand the behavior of Arduino and ADS1115.

so I'd appreciate it if you could stick with my trial and error a bit longer.

@TomGeorge

PS. Keep experimenting, great way to learn
PPS. Have you looked at using the ADS1115 in differential mode to lower your common mode noise?

In addition to the results with the ”correct way” to connect the GND, I will also post the verification in the differential mode later. I'd appreciate it if you could take a look.