Drives this useful I/O port expander. Example is provided for the PiFace, which is how I tested this library. Wire the Arduino up to the PiFace as follows (other boards you're on your own): Note that ...

chip will report it as a logic high. In the example, we'll set up one chip. We will set "port A" to be all outputs and send to it in "byte mode". "port b" will be split into four inputs and four ...

備忘録程度にサンプルコード共有します。 D13 SCK -> MCP23S17_p12 D12 MISO <- MCP23S17_p14 D11 MOSI ->MCP23S17_p13 D5 -> /RESET_MCP23S17_p18 D4 -> /CS ...