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I'm using a Arduino Pro Mini (5v) to sense the voltage of an 18650 battery. The battery (that is being sensed)is also used to power the Pro Mini but the MCU is behind a boost-converter which outputs 5.05v. Would I be able sense the right voltage of the battery?

schematic

simulate this circuit – Schematic created using CircuitLab

The boost converter has an input voltage ranges to 0.9 to 5 volts and current of 600mA.

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  • most cheap switch-modes are not isolated, so the ground is common. there's little/no reason to isolate unless there's inverted voltages.
    – dandavis
    Mar 4, 2018 at 6:05

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Yes, if Vin- and Vout- are joined together inside the boost converter or share a common ground on the boost converter circuit board such as this one:

enter image description here

enter image description here

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  • My boost converter is different but the IN- and OUT- is connected.
    – JFetz2191
    Mar 4, 2018 at 4:51

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