@Matthias
Would you add a capacitor per sensor or for the whole bus?
My bus is quite stable, but I'm always trying to make it more stable. :-)
Den ons 19 juni 2019 kl 13:53 skrev Matthias Urlichs via Owfs-developers <
owfs-developers@lists.sourceforge.net>:
> On 19.06.19 13:03, Mick Sulley
On 19.06.19 13:03, Mick Sulley wrote:
> Yes all of my sensors are powered.
In that case, my next step would be to replace the "hot" sensor.
For added peace-of-mind, I'd also add a small capacitor (100nF or so)
between Vcc and GND.
--
-- mit freundlichen Grüßen
--
-- Matthias Urlichs
Yes all of my sensors are powered. I will do more investigation.
Thanks for the comments
On 19/06/2019 09:19, Matthias Urlichs via Owfs-developers wrote:
On 19.06.19 09:39, Jan Kandziora wrote:
The 1W host has to supply current to the 1W line to power all the
parasitic powered slave
On 19.06.19 09:39, Jan Kandziora wrote:
> The 1W host has to supply current to the 1W line to power all the
> parasitic powered slave devices.
Well, the solution is to not parasitically power anything.
Of course you can't do that with DS2401 switches or iButtons, but the
other 1wire ICs have Vcc
Am 17.06.19 um 22:35 schrieb Mick Sulley:
>
> So the question is - is it possible to have a fault on a DS18S20 which
> can cause it to heat up and pull the voltage down?
>
Certainly. But the fault isn't the DS18S20 but the 1W host.
The 1W host has to supply current to the 1W line to power all the
My system comprises multiple DS18S20, DS18B20 temperature sensors, some
DS2438 I/O modules and a DS2437 to measure system voltage.
The voltage normally sits at around 5.1 volts, up to maybe 5.15 when no
outputs are on, down to 4.95 with several outputs on.
A while back I saw the voltage drop
