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This is why 4-20 mA is a common signaling standard in industrial automation. 4 mA means zero and 20 mA means one. 0 mA means broken transmitter !
Interesting. That makes sense, but what’s the reason for using current instead of voltage as the variable?
Wow, Factorio is approaching Full Time Job levels of detail and work required to keep everything running. Incredible game that I will never play, I feel I’m back at my job!
Usually games or hobbies that feel like a job are much more fun because there's nothing wrong happening if you fail at it, or if one day you decide not to show up.
A bit of an off-topic: I only ever saw white traffic lights in the US and Canada (specifically, pedestrian traffic lights) and they confused me a lot at first - the rest of the world uses green. The icons displayed (hands) are confusing too: the rest of the world uses an icon of a man walking or standing.
This is why 4-20 mA is a common signaling standard in industrial automation. 4 mA means zero and 20 mA means one. 0 mA means broken transmitter !
Interesting. That makes sense, but what’s the reason for using current instead of voltage as the variable?
if dinosaurs and nobody anticipated dinosaurs > expected
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Just want to note that the novel noted in the first post, The Moon Is A Harsh Mistress , is a great read. I think I read it after seeing it recommended in Mary Robinette Kowal's Lady Astronaut series, but it's a nice balance of technical and science fiction with politics, almost like a condensed version of KSR's Mars Trilogy. It's mostly (not entirely) devoid of the more typical Heinlein sexism/objectification.
This is why 4-20 mA is a common signaling standard in industrial automation. 4 mA means zero and 20 mA means one. 0 mA means broken transmitter !
It is also why white traffic lights no longer mean "go". White means "the red glass lens in front of the incandescent bulb shattered again". Related, from train signals: > The invention of the track circuit in 1872 by William Robinson permitted automatic block signals. Most simply, a low voltage battery current runs up one rail and down the other. As long as current flows from the battery through one rail to the rela…