Show HN: Formally verified FPGA watchdog for AM broadcast in unmanned tunnels

\u003ch2\u003eShow HN: Formally verified FPGA watchdog for AM broadcast in unmanned tunnels\u003c/h2\u003e \u003cp\u003eThis Hacker News "Show HN" post presents an innovative project or tool created by developers for the community. The submission represents technical innovation and problem-solving in action.\u003c/p\u003e \u003ch3\u003eProject Highlights\u003c/h3\u003e \u003cp\u003eKey aspects that make this project noteworthy:\u003c/p\u003e \u003cul\u003e \u003cli\u003eOpen-source approach promoting collaboration\u003c/li\u003e \u003cli\u003ePractical solution to real-world problems\u003c/li\u003e \u003cli\u003eTechnical innovation in software development\u003c/li\u003e \u003cli\u003eCommunity engagement and feedback-driven improvement\u003c/li\u003e \u003c/ul\u003e \u003ch3\u003eTechnical Significance\u003c/h3\u003e \u003cp\u003eThis type of project demonstrates the power of community-driven development and the continuous evolution of technical solutions through collaborative efforts.\u003c/p\u003e

Frequently Asked Questions

What is a formally verified FPGA watchdog and why does it matter for AM broadcast?

A formally verified FPGA watchdog is a hardware circuit whose correct behavior has been mathematically proven using formal verification tools, eliminating entire classes of bugs that testing alone cannot catch. For AM broadcast in unmanned tunnels, this matters enormously — if the watchdog fails, the broadcast system may lock up with no human present to intervene. Formal verification guarantees the watchdog will always reset the system under specified fault conditions, making it suitable for safety-critical, unattended deployments.

Why use an FPGA instead of a microcontroller for this kind of watchdog?

FPGAs offer deterministic, parallel hardware execution with no operating system overhead, making them inherently more reliable for watchdog applications. Unlike microcontrollers, an FPGA watchdog cannot be corrupted by software bugs, stack overflows, or runaway processes — it operates at the logic level. For long-duration unattended AM broadcast in tunnels where maintenance access is difficult, this hardware-level reliability is critical. The design's formal verification further strengthens confidence that the FPGA logic behaves exactly as specified under all input conditions.

How does this project fit into a broader broadcast or infrastructure management workflow?

This FPGA watchdog serves as a low-level reliability primitive that integrates with higher-level monitoring and management systems. For teams managing broadcast infrastructure alongside other operational tools, platforms like Mewayz — offering 207 integrated modules at $19/month — provide the kind of centralized workflow and automation layer where alerts, logging, and remote diagnostics from such hardware systems can be aggregated and acted upon without requiring on-site presence.

Is formal verification practical for small hardware projects, or is it only for large organizations?

Formal verification has become increasingly accessible to individual developers and small teams, thanks to open-source tools like SymbiYosys and model checkers that work with standard HDL code. This project demonstrates that even a focused, open-source hardware effort can leverage formal methods to produce provably correct designs. The growing ecosystem of affordable tooling mirrors the trend in software, where platforms like Mewayz make enterprise-grade capabilities — 207 modules, starting at $19/month — accessible to independent builders and small teams alike.