The Flea-Scope is a low-cost, open-source USB oscilloscope, logic analyzer, and arbitrary waveform generator. Designed with affordability and accessibility in mind, it utilizes a Cypress FX2LP microcontroller and features a minimalist design detailed in a comprehensive, publicly available PDF. The document covers hardware schematics, firmware, software, and usage instructions, enabling users to build, modify, and understand the device completely. The Flea-Scope aims to be a practical tool for hobbyists, students, and professionals seeking a basic, yet versatile electronic test instrument.
Robert Tarardi's "Flea-Scope: An Inexpensive, Source-Available USB Oscilloscope, Logic Analyzer, and More" details the design and implementation of a versatile, multi-function test and measurement instrument built around a low-cost Cypress FX2 microcontroller. The Flea-Scope, notably priced at a target of $18, aims to provide hobbyists, students, and professionals with a readily accessible tool for electronic signal analysis without the significant financial investment required for traditional equipment.
The document extensively covers the hardware and software components of the Flea-Scope. On the hardware side, it describes the utilization of the Cypress FX2LP microcontroller, which offers a high-speed USB 2.0 interface and sufficient processing power for real-time data acquisition and manipulation. The design incorporates an analog-to-digital converter (ADC) for capturing analog waveforms, effectively functioning as an oscilloscope. Additionally, digital input/output (I/O) pins are employed for logic analysis, enabling the capture and visualization of digital signals. Furthermore, the flexibility of the FX2 allows for the implementation of other functionalities, such as arbitrary waveform generation and programmable power supply control, expanding the Flea-Scope's utility beyond traditional test equipment. The document provides detailed schematics, component lists, and PCB layout information, facilitating replication of the hardware.
The software aspect of the Flea-Scope is equally crucial. Tarardi explains the firmware running on the FX2, responsible for handling data acquisition, processing, and communication with the host computer. The document also details the host-side software, which provides a user interface for controlling the Flea-Scope, displaying captured data, and performing analysis. The software is designed to be cross-platform, compatible with various operating systems. Furthermore, the entire project is open-source, allowing users to modify and extend the functionality based on their specific needs. This open-source nature encourages community contribution and facilitates further development of the Flea-Scope platform. The author emphasizes the low cost and open design as key features, making the Flea-Scope an attractive option for budget-conscious individuals and educational purposes. The document provides thorough explanations of the software architecture, control flow, and user interface elements, enabling users to understand and customize the software.
Summary of Comments ( 100 )
https://news.ycombinator.com/item?id=43068585
Commenters on Hacker News generally praised the Flea-Scope for its affordability and open-source nature, finding it a compelling option for hobbyists and those needing a basic tool. Several pointed out its limitations compared to professional equipment, particularly regarding bandwidth and sample rate. Some discussed potential improvements, including using a faster microcontroller and enhancing the software. The project's use of a Cypress FX2 chip was highlighted, with some expressing nostalgia for it. A few users shared personal experiences using similar DIY oscilloscopes, and others questioned the practicality of its low bandwidth for certain applications. The overall sentiment was positive, viewing the Flea-Scope as a valuable educational tool and a testament to what can be achieved with limited resources.
The Hacker News post titled "Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]" has generated several comments discussing the Flea-Scope project and its implications.
Several commenters express excitement about the project's affordability and open-source nature, viewing it as a potential game-changer for hobbyists and professionals alike. They praise the author for making such a powerful tool accessible to a wider audience.
Some users discuss the potential applications of such a device, ranging from educational purposes to debugging complex electronics projects. The low price point is repeatedly mentioned as a key factor that could enable wider adoption and experimentation.
A few commenters delve into the technical aspects of the Flea-Scope, comparing it to similar devices and discussing its limitations. Some acknowledge that its performance might not match high-end oscilloscopes but emphasize its value as a portable and inexpensive alternative for many tasks. There's some discussion around the use of an ATTiny85 microcontroller and its capabilities relative to the project's goals.
The project's open-source nature sparks conversations about potential improvements and modifications. Commenters suggest adding features, improving the software, and exploring different hardware configurations. This thread highlights the collaborative potential of open-source projects.
Some skepticism is expressed regarding the claimed $18 price tag, with commenters pointing out that this likely doesn't include the cost of some necessary components like the USB connector and PCB. However, even with these additional costs, the overall price is still considered remarkably low.
One commenter expresses concern about the Flea-Scope being potentially misused for malicious purposes, like eavesdropping on keyboards. This raises an interesting point about the dual-use nature of such technology.
Overall, the comments reflect a positive reception of the Flea-Scope project. The combination of low cost, open-source design, and versatile functionality generates considerable interest and discussion among Hacker News users. They see it as a valuable tool for learning, experimentation, and practical electronics work.