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   REPLYADDR 57r.1283@etq5.net   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  2b445bee   
   REPLY:  cfc74593   
   PID: SoupGate-Win32 v1.05   
   On 1/7/24 8:51 PM, Chris Schram wrote:   
   > On 2024-01-07, bob prohaska  wrote:   
   >>  From time to time my Pi 4 running   
   >>   
   >> Linux raspberrypi 6.1.21-v8+ #1642 SMP PREEMPT   
   >> Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux   
   >>   
   >> crashes when a USB device is plugged into it.   
   >> The Pi4 boots from a usb3 mechanical disk.   
   >   
   > What I am about to describe may be an unrelated phenomenon:   
   >   
   > I run a Pi4b in the Official Case with the Official Fan. [I don't   
   > recommend that fan to anyone. It does not get much airflow unless the   
   > case is propped open.]   
   >   
   > The operation of the fan tends to build up a static charge throughout   
   > the case's environment. When a USB device is plugged in, there is often   
   > a brief static discharge, which can have an undesirable effect on the   
   > Pi. I might get a screen glitch or a hang or a crash or a reboot,   
   >   
   > I alleviate this problem by using an old unpowered Radio Shack USB hub.   
   > This minimizes static buildup, and keeps any potential discharge some   
   > distance from the Pi's circuit board.   
      
      Buy a pack of bubble-gum ... the foil/paper wrapper for   
      each stick can be teased into its component parts. The   
      ultra-thin foil is slightly sticky. Stick it all over the   
      inside of the case (we used to stick 'em to school desks   
      back in the day) by rubbing it on with a bit of hard wood   
      or something of similar characteristics. A pencil worked   
      for the school desks.   
      
      Weave in a fine wire that touches both the ground plane   
      of the Pi and the foil in the case. Doesn't have to be a   
      super-good soldered connection.   
      
      If you use WiFi then maybe leave the upper 1/3rd of the   
      case un-foiled around where the WiFi antenna thingie is.   
      An all-metal case would work for the static, but will   
      block a lot of the WiFi signal.   
      
      This should safely drain-off static charge.   
      
      Apparently you live in a VERY dry area - always a prob   
      for electronics. Hell, lived in a US western town high   
      in the mountains for awhile. In the winter you could   
      easily draw a 4-inch spark off a door-knob just by   
      walking across a carpet first. Guess that's about a   
      200,000 volts or so. Actually HURT ! You learned to   
      lead with a knuckle ....   
      
      Oh yea, Pi-compatible fans ... they mostly ARE crap.   
      Lucky if you can go 6-months before the bearing goes   
      and they start making noise. OTOH, they only cost a   
      couple of dollars ........   
      
   --- SoupGate-Win32 v1.05   
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