It should detect it automatically, if you look at the Arduino IDE example, there is no i2c address configuration
I’ll still see if it can be set to 0x20
Address is defined in Adafruit_MCP23017.h
...............................
};
#define MCP23017_ADDRESS 0x20
// registers
#define MCP23017_IODIRA 0x00
#define MCP23017_IPOLA 0x02
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