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LED 4 (19)BATT-LED 5 (5)resetLED 6 (6)Speaker +Speaker -
SCL (30)SDA (7)Button 2 (23)Data 5 (24)RX (8)TX (9)Data 4 (17)Data 3 (0)Data 2 (1)Data 1 / ID (16)
GND
(18) LED 3BATT-(10) LED 2boot(13) LED 1
5V(21) Button 1(22) Button 3
ResetGND3.3vSWDIOSWDCLK
BATT+