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Is there a procedure for setting the address on multiple GPIO-ext cards?
A0/A1/A2 all seemed tied to 0V. Do they float to +V or do you have to specifically wire the pins to +V to get them to recognise?
actually just found the answer in the data sheet . . .
A2/SO 3 1 3 I/O Hardware address input (MCP23008)/
Serial data output (MCP23S08).
A2 must be biased externally.
A1 4 2 4 I Hardware address input. Must be biased externally.
A0 5 3 5 I Hardware address input. Must be biased externally
so presumably I’ve got to bend the pins back and connect them to +V for the address.