The ArduinoCore-zephyr 0.90.0 release marks a big shift in the Arduino ecosystem: the Zephyr-based core is now officially stable and no longer in beta. This is the new primary framework for advanced Arduino boards, while the legacy mbedOS-based cores enter their deprecation phase as mbedOS itself reaches End of Life.
New boards and hardware features
Version 0.90.0 significantly expands hardware support:
- Arduino Nano RP2040 Connect – now officially supported. You can run Zephyr RTOS on RP2040 while keeping full Arduino API compatibility.
- Portenta H7 and Portenta C33 – now have native SD card support, making it straightforward to log data or host local files on external memory.
- Nano 33 BLE – gains official PDM library support, enabling digital microphone input for audio sampling, noise detection, and edge AI voice applications.
