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12 lines
550 B
Plaintext
12 lines
550 B
Plaintext
PPS pin
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Some GPS receivers have a PPS pin.
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This can be used to get a very accurate time reference.
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According to `Wikipedia <https://en.wikipedia.org/wiki/Pulse-per-second_signal>`_ this signal could be considered a "stratum-1 time source".
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The signal on the PPS pin is a high pulse of +/- 100 msec and the rising edge signals the start of a second.
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The time reported after this pulse describes the past rising edge of the PPS pulse.
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.. note:: Currently the PPS feature is not thoroughly tested yet, so consider it experimental.
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