Raspberry Pi Pico to Arduino Uno adapter relies on FlexyPins for castellated holes - CNX Software

Solder Party's "Raspberry Pi Pico to Uno FlexyPin Adapter" uses FlexyPins to secure the Pico board to the adapter using its castellated holes.

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Raspberry Pi Pico FlexyPin Adapter

Raspberry Pi Pico to Arduino Uno adapter relies on FlexyPins for castellated holes - CNX Software

Raspberry Pi Pico to Uno FlexyPin Adapter by Solder Party

Solder Party's FlexyPin Adapter offers a swift way to bring the Uno form-factor to the Raspberry Pi Pico

Surface-mount connectors hold castellated modules

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