An updated guide is available in the Adafruit Learning System: Adafruit 128×64 OLED FeatherWing. A new page called Wiring to other Microcontrollers has been added describing how to wire the FeatherWing to non-Feather boards with some examples.
While wiring to a non-Feather board is not recommended, it is still possible. This page will show you how to do that. At a minimum, you must connect the RST pin in addition to 3V, GND, SCL and SDA, so using just a Stemma QT cable by itself is not possible. This page will show you how to wire the OLED FeatherWing up to a Metro M4 using just wires as well as the Metro ESP32-S2, which has a built-in STEMMA QT Port. Other boards may vary a bit.
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