Royd-097 — ((free))

royd‑097 excels when the project needs a cheap, easily‑debuggable board with optional RF and a permissive open‑source firmware base. For Wi‑Fi‑centric designs, ESP32‑based boards are usually a better fit.

Here are some questions to consider:

| Feature | royd‑097 | ESP32‑DevKitC | STM32‑Nucleo‑F401RE | |---------|----------|--------------|----------------------| | | Cortex‑M4 @ 72 MHz | Tensilica LX6 dual‑core @ 240 MHz | Cortex‑M4 @ 84 MHz | | Wi‑Fi / BT | Optional external 2.4 GHz module | Integrated Wi‑Fi / BT | None (add‑on required) | | Flash | 256 KB on‑chip + optional 2 MB SPI | 4 MB internal flash | 512 KB on‑chip + optional external | | Price (2022) | ≈ $12 | ≈ $9 | ≈ $14 | | Community Support | Small but active (GitHub, forum) | Massive (Espressif) | Moderate (ST community) | | Security‑Features | Basic (lock‑bit, DFU) | Secure boot, flash encryption (optional) | Lock‑bit, optional secure firmware (via ST tools) | | Best Use‑Case | Low‑cost, simple IoT prototypes + teaching | Wi‑Fi‑heavy projects | General purpose ARM‑M4 development | royd-097