The MCP23017 16 pin I/O expander does not work properly. I have followed the datasheet and the instructions in the example code on Github, but the chip does not do anything except turn on like 3 pins HIGH, and only one should be HIGH. This is weird. Can not even bring it to LOW. All connections are fine, I have orientated the chip so I can read the label on it. According to the datasheet, I have done everything right (I hope).
Please Please please help, this is urgent.
Thanks a lot