user42453: 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?

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.

user37523: 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:



42453: <p>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?</p>



<p><img src="https://i.stack.imgur.com/9yFJI.png" alt="schematic"></p>



<p><sup><a href="/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f9yFJI.png">simulate this circuit</a> &ndash; Schematic created using <a href="https://www.circuitlab.com/" rel="nofollow">CircuitLab</a></sup></p>

<p>The boost converter has an input voltage ranges to 0.9 to 5 volts and current of 600mA.</p>
 37523: <p>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:</p>

<p><a href="https://i.stack.imgur.com/ANX1b.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ANX1b.png" alt="enter image description here"></a></p>

<p><a href="https://i.stack.imgur.com/1zNkF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1zNkF.png" alt="enter image description here"></a></p>
