glossary:glossary_d
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glossary:glossary_d [2016/09/27 13:56] – [Digitrax] thenudehamster | glossary:glossary_d [2018/01/29 06:23] – Added the Debounce entry Wayne | ||
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Digital Command Control. DCC systems allow you to simulate prototypical train operation on your model railroad. With DCC you can operate multiple locomotives independently at the same time on the same section of track without a computer and without blocking or other complex wiring schemes. DCC systems use digital data packets to communicate commands to decoders that control locomotives and turnouts on the railroad. | Digital Command Control. DCC systems allow you to simulate prototypical train operation on your model railroad. With DCC you can operate multiple locomotives independently at the same time on the same section of track without a computer and without blocking or other complex wiring schemes. DCC systems use digital data packets to communicate commands to decoders that control locomotives and turnouts on the railroad. | ||
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+ | ===== Debounce ===== | ||
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+ | Most mechanical switches and relays have springy contacts that can bounce when thrown. This will deliver multiple pulses to the electronics and play havoc when a circuit or software only wants to see one pulse or step in the signal. The classic cure is to add a delay of several 10s of Milliseconds after the first step so repeats can be ignored. The delay length can vary according to known switch parameters. Nowadays that is most easily done in the software and is typically called Debounce delay. | ||
+ | For hard-wired logic in CMOS, TTL etc, with no software, the usual method of trapping bounces is to add a bistable between the switch and main input. | ||
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The DIODE is an electronic component that allows the passage of current in only one direction. | The DIODE is an electronic component that allows the passage of current in only one direction. | ||
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+ | ===== Dirty PSU ===== | ||
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+ | If the feed wires from PSU to load are of sufficient length to have a bit of impedance and supply several loads, then the dirt caused by one load can cross to other loads. This would usually be positive & negative sharp spikes superimposed on the dc. If the PSU is inadequate and feeds clean and dirty loads then the effects can also cause Pic ( or other microprocessor ) " | ||
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+ | The separation of the digital low current circuitry with a separate " | ||
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glossary/glossary_d.txt · Last modified: 2024/03/10 11:55 by mike_randall