What I learned is that when not using the SMD ads1115 you need the resister. The 2 different ADS1115 boards work exactly the same, just that with the new one you have to wire the 4 pins in the board to the PCB. Without the resister, I believe you would have the same voltage at ampseal pin2 as you would have at one of the holes shown in this picture shown here. The other hole will probably match the ADS1115 A0. Using EasyEDA, you can put your cursor over the pins/holes and see the connections.
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