Edited by tkaiser at Mon Nov 3, 2014 08:03 |
seblucas replied at Mon Nov 3, 2014 06:45
The accuracy of DS18B20 is not really that bad ;)
I'll see when they arrive in a few weeks whether I got cheap clones or good ones (just ordered 2 x 10 DS18B20 and 12 DHT11).
I want to build cheap enclosures for all of my SATA capable ARM boards (Banana Pi, A20-OLinuXino-LIME2, Wandboard Quad and Cubietruck) combined with a 3.5" HDD that should be as small and as less noisy as possible. Will build a prototype, cram both 12 DHT11 and 12 DS18B20 into, start different temperature calibration runs in the range of 7° - 60° Celsius -- double checking whether the BananaPi responsible for recording the temperature values will automagically shutdown when the PMU's temperature exceeds approx. 55° --, will then try to 'calibrate' all sensors and do 'real world' tests with the enclosure stuffed with HDD and second Banana Pi under different load scenarios to verify if passive cooling solely done by convection works.
The 'final product' will be a present for our customers: Some sort of an ugly looking but functional monitoring appliance (running either OpenNMS or OMD) capable of recording TBytes of data from the whole network, able to check environmental parameters of the server cabinet the device is mounted in and could be easily extended to an 'IP camera' or 'LAN power strip' by simply adding cheap USB peripherals like the EG-PM2.
If we succeed building this stuff I'll document it here...