Hi Andreas ah it is a counter ... then you use COUNTER ... I thought you had something detecting events ... then you could use update to 'load' and event into the rrd.
cheers tobi ----- On Mar 10, 2017, at 4:37 PM, Andreas Schuldei <andr...@schuldei.org> wrote: > I changed that and am puzzled. > how do i deal with the huge offset? In that setup, the value the device > returns > is ~8000, and its a 64bit counter... > in an other thread ( [ > https://lists.oetiker.ch/pipermail/rrd-users/2014-September/020015.html | > https://lists.oetiker.ch/pipermail/rrd-users/2014-September/020015.html ] ) > that seems to deal with a similar issue, someone recommend: > "Alternatively, you could use Absolute and reset the counter each time - then > you don't need to worry about storing the total." > I can not reset the counter in the device. Or is that some rrdtool counter > that > i can reset with some clever CDEF magic? > And how will the data, which "absolute" would give me, be usable in my case? > from the documentation ( [ > https://oss.oetiker.ch/rrdtool/tut/rrd-beginners.en.html | > https://oss.oetiker.ch/rrdtool/tut/rrd-beginners.en.html ] ) i understand i > would get an slowly ascending staircase. But in what way can i use that to > emulate my incoming power? ever increasing power from my solar panels would be > awesome, but that is not what I experienced before using rrdtool :-) > On Fri, Mar 10, 2017 at 3:10 PM Tobias Oetiker < [ mailto:t...@oetiker.ch | > t...@oetiker.ch ] > wrote: >> if you have 'pulses' use the ABSOLUTE DS type ... >> and the multiply the result by whatever a pulse is worth >> cheers >> tobi >> ----- On Mar 10, 2017, at 2:46 PM, Andreas Schuldei < [ >> mailto:andreas%2brrdt...@schuldei.org | andreas+rrdt...@schuldei.org ] > >> wrote: >>> This is a graph i get with my current intake of sun and my setup, >>> consisting of >>> thermo sensors on in- and outgoing water pipes, as well as a water meter, >>> emitting S0 impulses, indicating that 10l of fluid were pumped. >>> My Issue is with dealing with the impulses in a sensible way. The interval >>> of >>> these impulses varies, depending on the sun intake. >>> currently my CDEF for the solar power is >>> d,c,-,a,*,10,*,4.190,* >>> where c and d are my temperatures, and a is my counter, indicating 10 >>> liters. >>> (4.190 is the specific heat constant of water.) >>> Now what is calculated by that CDEF is not really the solar power, its the >>> momentary value, only, calculated for the duration of the impulse, which is >>> the >>> width of my sampling rate (which is 10sec). it would have been more >>> accurate to >>> take the time between the impulses and calculate the incoming energy during >>> that period, divided by the duration of that time and graph that for the >>> previous (or following) interval. >>> How can I do that? >>> _______________________________________________ >>> rrd-users mailing list >>> [ mailto:rrd-users@lists.oetiker.ch | rrd-users@lists.oetiker.ch ] >>> [ https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users | >>> https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users ] >> -- >> Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland >> [ http://www.oetiker.ch/ | www.oetiker.ch ] [ mailto:t...@oetiker.ch | >> t...@oetiker.ch ] [ tel:+41%2062%20775%2099%2002 | +41 62 775 9902 ] -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland www.oetiker.ch t...@oetiker.ch +41 62 775 9902
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