Changes

ONce you have this then you can see that your MCP23017 is connected to Address A 0 . The default onfig. But you can change this if there is a conflict or your MCP23017 board has a different address set up.

Once you have this then you can see that your MCP23017 is connected to Address A 0 . The default config. But you can change this if there is a conflict or your MCP23017 board has a different address set up.

That's what the A0, A1 & A2 pins are for.

That's what the A0, A1 & A2 pins are for.

Conversely, if you don't see this, then you aren't ommunicating so you will need to investigate if there is something that is preventing the 12C bus working. It could be a short circuit or a broken wire or perhaps you have got the wires in the wrong order. By enlarge it's fairly forgiving and you probably haven't damaged anything, just  . . .

Conversely, if you don't see this, then you aren't communicating so you will need to investigate if there is something that is preventing the 12C bus working. It could be a short circuit or a broken wire or perhaps you have got the wires in the wrong order. By and large it's fairly forgiving and you probably haven't damaged anything, just  . . .

  Make Notes!!

  Make Notes!!