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Step 3Time Keeping
A PIC 16F684 micontroller is at the heart of the watch. This uC keeps time, runs the KD155 BCD/nixie display (previous step), and controls the power supply (next step). This is a 14 pin part available in DIP and SOIC (.150) packages from Microchip.
For development purposes we use the calibrated internal oscillator running at 125Khz to count seconds. The final design will use a precision watch crystal to save power (see final step & part 2).
For development purposes we use the calibrated internal oscillator running at 125Khz to count seconds. The final design will use a precision watch crystal to save power (see final step & part 2).
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