Scalable Relay Switching Platform for Automated Multi-Point Resistance Measurements

TL;DR

This paper introduces a scalable, automated relay switching platform for multi-point resistance measurements, simplifying complex DC analysis with a flexible, expandable design suitable for research and industrial applications.

Contribution

The paper presents a novel 4x4 relay-based switching system with open-source hardware and firmware, enabling scalable and automated multi-point resistance measurements.

Findings

System simplifies multi-point resistance measurements.

Platform demonstrates reliable contact stability with bistable relays.

Successful application to complex resistive network analysis.

Abstract

In both research and industrial settings, it is often necessary to expand the input/output channels of measurement instruments using relay-based multiplexer boards. In research activities in particular, the need for a highly flexible and easily configurable solution frequently leads to the development of customized systems. To address this challenge, we developed a system optimized for automated direct current (DC) measurements. The result is based on a 4x4 switching platform that simplifies measurement procedures that require instrument routing. The platform is based on a custom-designed circuit board controlled by a microcontroller. We selected bistable relays to guarantee contact stability after switching. We finally developed a system architecture that allows for straightforward expansion and scalability by connecting multiple platforms. We share both the hardware design source files and the firmware source code on GitHub with the open-source community. This work presents the design and development of the proposed system, followed by the performance evaluation. Finally, we present a test of our designed system applied to a specific case study: the DC analysis of complex resistive networks through multi-point resistance measurements using only a single voltmeter and current source.