Arduino Uno + Ethernet Shield + MCP23S17

Using Arduino Project Guidance
1

Hello,

I want to use both Ethernet Shield and MCP23S17 with my Arduino Uno board. The problem is that PIN 10 is already used by Ethernet Shield and I don't know where to connect the SS of the MCP23S17. Also, does these 2 SPI devices can run together with the UNO without conflict. Does anybody has an experience about that ?

2

Why not use the MCP23017 instead? It has a I2C interface and will not conflict with your Ethernet shield.

3

Very good idea. I'll have a look on that. Thanks