Overview

Sorting resistors is a tedious task. Reading the color bands becomes harder when the color of the resistor has low constrast with the color bands. A solution for sorting resistors is to use a multimeter with an intgrated ohm meter. The following design process is for an ohm meter that displays the value, nearest standard value, and percent error of the resistor.

Measurment

Standard Values

Resistor values are spaced apart on a logorithmic scale. The E-series denotes that every decade is divided by that number. The following formula, sourced from Jeremy Webb’s website, is used to calculate the standard resistor values.

\(
\begin{align} R = d \ast 10^{\frac{i}{N}}, \end{align} \)

\(
\begin{align} \begin{array}{r | l} \\ \text{} & d \text{ = decade multiplier: 10, 100, 1k, ...} \\ \text{where} & N \text{ = E-series (tolerance %): 12, 24, 48, 96} \\ \text{} & i = 0 \dots N-1 \end{array} \end{align} \)

Error

Implementation

UPDATES COMING SOON

Rafael Reyes

Electrical Engineer with interest in embedded design, PCB design, and robotics. Founder of Catto Electronics. Dedicated to learning through experience and collaboration.

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