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(18) LED3(19) LED2(21) Button1(13) LED1BATT-GNDBATT+5V(7) SDARESETGND3.3v(16) Data1/ID(9) TX(0) Data4/DAC
LED4 (10)LED5 (5)Button2 (23)LED6 (6)BATT-Speaker+Speaker-Button3 (22)Data3 (17)RX (8)SWDCLKSWDIOSCL (25)Data2 (1)SD Power (11)
BOOT RESET