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Seeeduino XIAO The Smallest Arduino Microcontroller Based on SAMD21,with Rich Interfaces, 100 Arduino IDE Compatible, desiged for Projects Need Arduino Micro3 pcs. 4.6 out of 5 stars 197. 21.99 21. 99. Join Prime to save 2.20 on this item. Get it as soon as Tue, Mar 2.