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The PCF8574_LH library provides a simple interface for controlling the PCF8574 I/O expander using the I2C communication protocol. It allows you to read and write values to the PCF8574's registers, ...
The LCM2004A module is commonly interfaced for I2C with a PCF8574A or optionaly a PCF8574. The default I2C address of the module is commonly 0x3F or optionaly 0x27.
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