just asking if it possible to use with my raspberry Pi a MCP23017, [b]AND [/b]MCP3008 [b]AND[/b] a ULN2803 (or L293D ).
The MCP23017 to extend RasPi GPIO
The MCP3008 for the DAC and ...
The ULN2803 (or L293D ) for my stepper motor.
I had to use a DS18B20, a PIR sensor, a Magnetic Door Sensor , a photoresistor (LDR), ... .
And for future, a LCD or multi led panel