[rrd-users] counting pellets with rrd

Matthias Lemke m at box.li
Sun Dec 11 10:00:40 CET 2011

Alex van den Bogaerdt schrieb:
> ----- Original Message ----- 
> From: "Matthias Lemke" <m at box.li>
> To: <rrd-users at lists.oetiker.ch>
> Sent: Saturday, December 10, 2011 9:54 AM
> Subject: [rrd-users] counting pellets with rrd
>> Hello,
>> I connected my eta pellets heating unit via webservices to my home
>> server. I am interesting in counting the amount of pellets per day (warm
>> weather days should have low counts of pellets). The unit has a counter
>> that counts from zero up forever... The unit sends the value in "kg".
>> normally I have around 15...20 kg / day.
>> I want to have a graph that shows me the kg/day. So I thought that I can
>> write one data per day to the rrd. But, after two nights of testing and
>> testing, I have no idea for the correct rrd setup...
> In addition to what's already mentioned, don't forget that you need to modify the heartbeat setting from its default.


> You say that you want to know the amount of pellets. RRDtool has no idea how many pellets weigh a kilogram, but if you know then you can tell RRDtool and show pellets per day. Just multiply (using a CDEF) by 86400 for 'per day' and by the amount of pellets per kg. This can be done in the same CDEF, even in the same multiplication.

Oh, that is a missinterpretation. I am interested in kg/day. Not really
counting the pellets :)


> Alex
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