Just to help anyone else using one of these# AliExpress #SAMD21 #M0 boards, pin marked D2 is actually pin4 and pin marked D4 is pin2
https://vi.aliexpress.com/item/4000169610268.html?spm=a2g0o.order_list.order_list_main.10.75281802K6zj5w&gatewayAdapt=glo2vnm

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