I am currently working on a project, which involves measuring current in a DC circuit and storing that generated data on an arduino microcontroller. I decided to go with the ADS1115 and a shunt, which is located in series on the low-side of the circuit I want to measure. It is a 0.001Ω shunt, which results in a voltage drop of 1mV per amp.
I have attached a schematics of the wiring (Note that there are multiple other devices connected in parallel on the arduino, which all have very little power consumption; I left them out for better reading)
The issue I'm having are the results the ADS1115 is giving me: When no voltage is applied to the left circuit, i get a single-ended reading of about -20, which in my application is unacceptable. When voltage is applied and the load draws current, i also get a reading, which is -20 bits off.
The ADS1115's supply voltage is around 4.98V and I am not sure if the problem lies in all the other components that are attached to the arduino's circuit.
I am not an electrical engineer but a software developer, so please take that into consideration when commenting on my schematics and/or wrong wiring. :)
Any help is appreciated!