===== NodeMCU =====

==== I2C ====

I2C can be used to connect up to 127 nodes via a bus that only requires two data wires, known as SDA and SCL.\\

SDA=4 => D2.\\
SCL=5 => D1\\

==== SPI ====

SPI is much simpler than I2C. Master and slave are linked by three data wires, usually called MISO, (Master in, Slave out), MOSI (Master out, Slave in) and M-CLK.\\

M-CLK => D5\\
MISO => D6\\
MOSI => D7\\
(SPI Bus SS (CS)is D8.)\\

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