Crafting an Open-Source Device: The HydraMeter Multi-Meter Project
The HydraMeter, an open-source multimeter developed by John Duffy, is making waves in the electronics community. Designed to measure voltage, current, and resistance, the HydraMeter boasts a modular architecture that offers optimized accuracy and isolation for each measurement function[1].
At the heart of the HydraMeter is a central Analog to Digital Converter (ADC) that digitises the signals from the dedicated input circuits for each measurement type[1]. The ADC's digital output is then processed by a microcontroller, which manages the user interface and drives a detachable display unit for easy viewing[1].
John Duffy's video, detailing the design of the HydraMeter, serves as an excellent resource for understanding the project's development process[1]. In the video, Duffy discusses various challenges he faced during the design phase, including user interface design, mechanical and enclosure design, modularity and connectivity, and educational transparency[1].
The current user interface, while opinionated, may not suit every user. Recognising this as a potential limitation, Duffy plans to add a rotary range switch to the UI in the upcoming version 2.0 to improve usability[1]. The case of the HydraMeter is 3D printed, with John Duffy praising his Bambu 3D printer for its role in prototyping. However, he expresses dissatisfaction with Solid Edge, the CAD software used for the enclosure design[1].
The HydraMeter's design also features robust D-sub connectors, praised for their ease of assembly, but careful consideration is required when detaching the display to maintain signal integrity and user ergonomics[1]. The HydraMeter has been a work in progress for several years, with the video providing detailed insights into the circuitry for a voltmeter, ohmmeter, and ammeter[1].
The HydraMeter is more than just a tool; it's a community-driven educational project. Duffy invites feedback, contributions, and forks of the design, and openly discusses both successes and setbacks as part of the project's ethos of transparency and community learning[1]. The KiCad design files for the HydraMeter can be found on the GitHub page, encouraging community involvement and customisation[1].
For those interested in the HydraMeter, a write-up about the project can be found on the website.io, and the video produced by John Duffy offers a comprehensive understanding of the design process[1]. The development of version 2.0 of the HydraMeter is anticipated, with improvements to the user interface and mechanical design on the horizon[1]. John Duffy expresses gratitude for the opportunity to produce the video explaining the HydraMeter design, emphasising the project's commitment to transparency and education.
[1] Based on provided bullet points.
John Duffy incorporates DIY technology in the design of the HydraMeter, inviting contributions from the community for its continuously evolving development. In the video detailing the project, he covers the utilization of a microcontroller for processing the readings from the Analog to Digital Converter (ADC).
