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@Blizzard
Hi Gordon,
I also suspect a problem with the I2C address.
For the simple (and working) C++ program I'm using, the address is the following:
#define SLAVEADDRESS 0x7E
I have read that the address of the PCF8574 adapter can also be 0x4E or 0x7E.
I replaced that address in the connectI2C () method, offered by the module for the HD44780 controller, that allows the connection by specifying a different I2C device address but the result has not changed.
Perhaps we also need to modify the HD44780 module file?
Thanks in advance