A while ago I received a couple of I/O port expander modules that use the I 2 C protocol. Using that Chinese module, you can use only the SDA and SCL pins of your Arduino, or any microcontroller ...
When attempting to use the 8-parameter alternate constructor to ignore the RW pin assignment, the compiler complains of "ambiguous" attempt. Example: // Code const uint8_t rs = 0, en = 2, d4 = 4, d5 = ...
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