Nautical bell: Difference between revisions
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en.wikipedia.org/wiki/Ship%27s_bell#Simpler_system. |
en.wikipedia.org/wiki/Ship%27s_bell#Simpler_system. |
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Note the traditional time zone was determined by local sun position |
Note the traditional time zone was determined by local sun position |
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and so should be |
and so should be local time without daylight savings time. |
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""" |
""" |
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function nauticalbells(dt::DateTime) |
function nauticalbells(dt::DateTime) |
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function nauticalbelltask() |
function nauticalbelltask() |
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untilnextbell = ceil(now(), Dates.Minute(30)) - now() |
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# parse for milliseconds til next hour, start timer with that delay |
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untilnexthour = now() - DateTime(match(r"^([^:]+)", string(now())).captures[1]) |
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println("Nautical bell task starting -- next bell in $delay seconds.") |
println("Nautical bell task starting -- next bell in $delay seconds.") |
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# The timer wakes its task every half hour. May drift very slightly so restart yearly. |
# The timer wakes its task every half hour. May drift very slightly so restart yearly. |
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wait(timer) |
wait(timer) |
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gong = nauticalbells(now()) |
gong = nauticalbells(now()) |
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@async(println("Nautical bell gong strikes $gong!")) # or do |
@async(println("Nautical bell gong strikes $gong!")) # or do audible tones |
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end |
end |
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end |
end |
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