I have been plagued by a problem with one of my control systems for a
number of years now and I am still trying to fix it. I have posted a
few times before, and following suggestions I have replaced some of the
cabling and replaced the power supplies with Meanwell MDR-20-5 units
Running 3.1p5 on a Raspberry Pi with Sheepwalk RPi3 adapter and RPi3a
splitters giving 8 busses, 27 DS1820 temperature sensors, 1 humidity
sensor and 7 DS2413 based I/O modules, spread over the 8 busses. All
devices are powered
The problem I have is that I loose usually 2 of the busses, but
occasionally all of them, they just stop reading and need a power cycle
to restart. It is random, can be a few hours up to a couple of months
between failures.
I have seen suggestions to add a capacitor to help fix this sort of
issue, I thought I remembered seeing something in a Maxim document but
cannot find it now. Can anyone tell me where I can find information on
this, what value capacitor, should it be between +5v and Gnd or DQ and
Gnd, at the adapter or at the far end, on every bus?
Thanks
Mick
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