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Topic: MCP23017 keypad hall (Read 425 times) previous topic - next topic


Apr 29, 2017, 03:32 pm Last Edit: May 01, 2017, 01:15 pm by sino93

I am trying to build a matrix keypad with Arduino Uno and a MCP23017 port expander. I got the MCP23017 working with the keypad_mc17 library to this point, even with different i2c addresse :)).

Now i want to use halls sensors instead of pushbuttons and i don't know how to wire them. I have 3144 hall sensors and little knowledge of electronics :)) I tried using different diagrams but none worked.


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