I solve these issues by using opto isolators on anything that leaves the box the BBB is mounted in.
On 6/29/2016 8:23 AM, Graham wrote: > There is a whole "hygiene" relative to grounding and ESD protection. > Is it in a metal box? > Is the metal box grounded? > Are all of your power supplies grounded? > Did you actually measure it? > (Most U.S. wall warts don't connect to safety ground, so the whole > system is floating, and anything can happen.) > Are there ground referenced ESD clamps on all I/O leaving the metal box? > Is the bench or table it is sitting on grounded? ESD mat? > > Without good grounding and protection "hygiene" all external wires, > including the Ethernet cables, the external wires all act as antennas > to pick up external noise and signals, including induced voltages from > lightning. > > A wall-wart without a safety-ground pin connection is the worst thing > you can run something from, from the aspect of ESD protection. > > --- Graham > > == > > > On Tuesday, June 28, 2016 at 7:22:42 PM UTC-5, Gerald wrote: > > Well, I don't know where to start. A detailed diagram of the > entire system hookup would help. > > Gerald > > > On Tue, Jun 28, 2016 at 7:11 PM, Wally Bkg <[email protected] > <javascript:>> wrote: > > It happened again, my Beaglebone White crashed as a > thunderstorm moved through the area. It is on a UPS, the same > UPS as my router ASUS RT-AC56 and Raspberry Pi2, neither of > which glitched in any way. > > It does have a lot of interface wiring hooked up but these are > very thoroughly EMP protected with Transorbs and have been in > use for 20+ years surviving tropical storm Allison, Hurricane > Ike, and many other national news worth storms in the Houston > area -- this was a pitiful storm by our standards never even > making the lights noticeably flicker, although the UPSes did > "beep" once. This protection was added in a rebuild after EMP > from Hurricane Alicia wiped out the initial system (pre-IBMPC > CMOS logic). > > Why is the BBW far more sensitive to this than the RPi2 using > similar 2A+ wall-wart power supplies plugged into the same UPS? > > My initial "work-around" would be a watchdog running on the > RPi2 to active a normally closed relay to interrupt the BBW > power supply so it'd restart after after the BBW dies. I've > already have in place network monitoring of the BBW status and > a "heartbeat" to detect when it stops. But I'd rather the BBW > didn't crash :( > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the > Google Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from > it, send an email to [email protected] > <javascript:>. > To view this discussion on the web visit > > https://groups.google.com/d/msgid/beagleboard/9305eb4a-be7e-4c4e-8985-404dc92fcc12%40googlegroups.com > > <https://groups.google.com/d/msgid/beagleboard/9305eb4a-be7e-4c4e-8985-404dc92fcc12%40googlegroups.com>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. > > > > > -- > Gerald > > [email protected] <javascript:> > http://beagleboard.org/ > [email protected] <javascript:> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/cae943c7-6211-4796-9037-f37dcbe56cf8%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/cae943c7-6211-4796-9037-f37dcbe56cf8%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/1638433c-9d6e-bac2-bfb5-1937a04e4753%40gmail.com. For more options, visit https://groups.google.com/d/optout.
