PCF8574 LCD I2C and SPI Bus Interface Module

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Ebay Module
IIC/I2C/TWI/SP​​I Serial Interface Board Module Arduino 1602 2004 LCD

This is I2C, TWI, SPI Serial Interface. Saves limited pin resources.
Addressing

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Texas Instruments Datasheet


PCF8574 Remote 8-Bit I/O Expander for I2C Bus:
http://www.ti.com/lit/ds/symlink/pcf8574.pdf

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20190503 - pre published v0.9