Hello!
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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