Physics — Sensors & Potential Dividers
Potential divider output and common sensing components.
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V_{out} = V_{in}\frac{R_2}{R_1 + R_2}
\text{thermistor: } R \downarrow \text{ as } T \uparrow
\text{LDR: } R \downarrow \text{ as light } \uparrow
\text{strain gauge: } R \propto \text{extension}