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// UBDS-ADAFRUIT-ITSYBITSY-M4MCUbeginnerLast verified 2026-04-07

Adafruit ItsyBitsy M4 Express

Adafruit Industries

Postage-stamp Cortex-M4F with USB-direct flashing and CircuitPython baked in. ATSAMD51 at 120 MHz, 192 KB RAM, 512 KB flash — small enough to drop into wearables and dense breadboard layouts without giving up performance.

itsybitsycircuitpythonsmall-form-factorusb-directbreadboard-friendlyprototypingwearablessensors
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Adafruit ItsyBitsy M4 Express
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