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E_INK_SDI
E_INK_CS
E_INK_DC
U2
E_INK_SDI
+3V3
E_INK_BUSY
E_INK_DC
SWITCH
E_INK_CLK
+3V3
E_INK_BUSY
E_INK_CS
+3V3
+3V3
SWITCH
E_INK_CLK
D1
D2

Smart Button with E-Ink display