Read post #3 ...
(and probably also this link: https://forum.arduino.cc/t/problems-with-16x4-lcd-i2c-interface/480283/2 )
It looks as if the library you are using doesn't fit to the hardware ...
Read post #3 ...
(and probably also this link: https://forum.arduino.cc/t/problems-with-16x4-lcd-i2c-interface/480283/2 )
It looks as if the library you are using doesn't fit to the hardware ...