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Topic: Connecting a graphical LCD via a I2C using a 16-bit port expander (Read 14 times) previous topic - next topic

Nick Gammon

I'm not sure what you mean by that. You are replacing one chip by two chips? Surely that involves a hardware change.

So you need to modify both.


cnavnath

is there any other option for mcp23017 ic. it is not easily available in india1

Nick Gammon


cnavnath

hello sir,
           i have done the same thing using pcf8574. but data display on lcd  very slowly. what are the speed parameter of i2c ,mcp23017 you have used. does wire length of i2c effects speed.

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