The 3 pack of ADS1115's arrived today & they're spot on! Looking forward to finishing this project & moving on to others. Thanks again for the responses. They confirmed what I was suspecting.

Thanks Edin. I had the same thought while driving to my sister in laws for the super bowl. I noted values from 1 to 15 volts & noticed the results were pretty linear when the input voltage was less than 8 or 9 volts. I'll do further experimentation tomorrow morning & will post the results.

Thanks gang! After doing more research and experimentation, I've decided to go with an external ADC. I ran the same experiment with Arduino Uno and Mega 2560 boards, and they were both quite accurate. The values returned were linear as the voltage increased. This project doesn't require a high level...

I've built a monitor for our dual sump pump system and need to obtain the voltage from the 12 volt deep cycle battery. I made a voltage divider using 13k and 3.2k resistors. I took seven readings across the voltage divider without any other components attached, from 9 to 15 volts. The outcome was as...