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Step 4Connect the dialer to the PIC chip.
Connect the rotary dialer to the PIC chip as seen in the diagram. Notice that I am reading in the state of the rotary dialer by using RC-timing. In other words, the PIC chip is counting the number of times it takes for a capacitor to discharge (which changes when resistance is added).
That is where the 20K resistor comes in. Adding this to the input allows for a clear differentiation between the signal from a closed and open rotary switch connection.
That is where the 20K resistor comes in. Adding this to the input allows for a clear differentiation between the signal from a closed and open rotary switch connection.
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