Royd-097 (2024)

| Use‑Case | Why royd‑097 is a good fit | |----------|----------------------------| | | Small footprint, built‑in USB for quick firmware flashing, and an inexpensive RF module slot. | | Educational labs | Low price (≈ US $12 in 2022) and abundant documentation on the community wiki. | | Security research / firmware analysis | Open‑source bootloader, accessible SWD pins, and a well‑documented firmware image (“royd‑097‑firmware.bin”) that is deliberately simple, making it ideal for teaching reverse‑engineering techniques. | | Home‑automation hobby projects | Sufficient I/O for basic actuator control, plus the ability to run lightweight RTOSes (FreeRTOS, Zephyr). |

The above numbers are derived from the most common hardware revision (royd‑097‑revA). Slight variations exist in “revB” and “revC” units, mainly in the size of the external flash. royd-097

The open‑source nature of the firmware and the modest complexity of the hardware make the platform popular for teaching both embedded‑software development and basic security concepts. | Use‑Case | Why royd‑097 is a good

No critical vulnerabilities remain unpatched in the last released firmware (v1.3.0, July 2025). The community has been proactive in releasing patches. | | Home‑automation hobby projects | Sufficient I/O

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