[HN Gopher] Reverse Engineering a Restaurant Pager System
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       Reverse Engineering a Restaurant Pager System
        
       Author : edward
       Score  : 38 points
       Date   : 2024-06-15 20:37 UTC (2 hours ago)
        
 (HTM) web link (k3xec.com)
 (TXT) w3m dump (k3xec.com)
        
       | perth wrote:
       | Noticed this person didn't want people to access the code for
       | fear of misuse. Thankfully, someone else has already made this
       | for flipper zero before them and released the code!
       | 
       | https://github.com/leedave/flipper-zero-meal-pager
        
         | thedrexster wrote:
         | << Does this even work: I don't know. It's based on intel
         | collected from other people. The Flipper sends data, I checked
         | that with a second flipper. I've also heard rumors that it
         | works in Australia. I'm sure it doesn't work in the US, as they
         | use different frequencies. >>
         | 
         | I mean, that's helpful, but....
        
       | whartung wrote:
       | I want to know how when you see a stack of pager, each one knows
       | its position in the stack so that when the stack decides to go
       | into "attract" mode, it animates them one by one, like an
       | elevator going up.
       | 
       | Somehow when they stack, they know where they are relative to the
       | other pagers (at least something does).
        
         | jrussino wrote:
         | If I recall, they have female port connectors on the bottom and
         | little male prong connectors that mate with them on top. I
         | assume that is mainly for power connection, so you can put a
         | whole stack on a charger and charge them all simultaneously.
         | But if they can sense a signal on the female pins then that's
         | sufficient to enable the behavior you're describing without
         | directly knowing the positions of each pager, right? Pager on
         | the bottom sees a signal on its female pins, blinks its light,
         | send the signal on its male pins, then the next pager above
         | sees the signal on its female pins, blinks its light, sends the
         | signal on its male pins, etc...
        
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       (page generated 2024-06-15 23:00 UTC)