I am using the arduino uno with an expansion I/O shield using a chip(MCP23017). Everything appears to work properly except when testing for a zero the if statement doesn't work. The following is my code with the resulting IDE serial printed results attached. I have tried changing the variables to di…

If test doesn't recognize zero

surepic May 7, 2018, 2:58pm 2

Topic		Replies	Views
MCP23S17 not working at all LEDs and Multiplexing	6	2617	May 6, 2021
[Tronixstuff] MCP23017 \| I2C Port \| Help wanted LEDs and Multiplexing	15	11698	May 6, 2021
MCP23017 I/O Expander Help General Electronics	51	9931	May 6, 2021
If statement and direct port access Programming	9	1286	May 5, 2021
Beginner's Boolean Troubleshooting	4	1476	May 6, 2021