So I am soldering the MCP23S17 based SPI slave selector board. Last time when I played with I2C based MCP23017, I added 2N7000 based 3V3 to 5V0 level shifter, and followed by buffers using HC537. Or I used ULN2803 to do the level shift, and then inverter and buffer and so the hardware is messy and occupy too much space. But a buffer is necessary to drive stepping motors.
This time I am not going to drive stepper motors, so I don't use level shifting and buffering ICs. So I can use the proto board space generously.
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