Even though this is marked 'off topic', there is a fair amount in common between physical access door controllers and PLCs. We have discussed the similarity and value of PLCs in Unicorns: Techs Good At Access and Video, Says Access Panel and fringe application cases: This Could Happen To Any PLC Manufacturer and Experience With Integrating Plcs Into VMS Or ACS.
In any case, as a child of 1980's Discovery Channel, one of my favorite all-time TV shows was eccentric Brit inventor and engineer Tim Hunkin's The Secret Life of Machines.
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