NodeMCU-BU01Specification V 1.0
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4.Definition of pins
NodeMCU-BU01 module has a total of 50 interfaces, such as the pin diagram, the
pin function definition table is the interface definition.
NodeMCU-BU01 Foot Schemes
Foot function definition table
Pin No.
Item
Functional Description
1
IO7
default value is used as SYNC input. this pin can be
reconfigured as a universal I /O pin GPIO7 under
software control.
2
IO6
universal I /O pin. when powered on, it is used as the
SPIPHA (SPI phase selection) pin for configuring the
SPI mode of operation. After power on, this pin will
default to universal I /O pin.
3
IO 5
universal I /O pin. when powered on, it is used as a
SPIPOL (SPI polarity selection) pin for configuring SPI
working mode. after power on, this pin will default to
