On Sun, Nov 21, 2010 at 07:40:25PM -0800, Kirk Wallace wrote: > > This is like another idea I have had. I have large compost piles that I > use to process garden and kitchen waste. The piles can be controlled by > monitoring temperature and adding green material, water and turning the > pile. I shoot for 120 degrees or more to kill pathogens and seeds. More > communities are turning to composting for recycling organic waste, so it > seems to me, there should be a market for wireless temperature/humidity > sensors for managing piles.
I see it now, a colour bar graph, ending with a flashing red "PILE CRITICAL" display when it's about to catch fire. :-) It's a good thing I'm not using any electrolytics in the temperature probe, given that Arrhenius' equation shows component lifetime halving for every 10 °C temperature increase. Optimising the Carbon/Nitrogen ratio of the input is supposed to maximise breakdown, I've read. (I had a simple program once, which optimised mixes of kitchen scraps vs grass or leaves vs manure.) But I just chuck in what I have. > For the welder helmet display, a voltage and amperage bar graph would be > the primary information. Although, I suspect any good operator would not > need the display. I also don't know if I would be able to watch the > puddle and display at the same time. I'll have to test this. Adding limits, and flashing a small LED to attract attention to the display when one is exceeded, might improve utility. Erik -- "Necessity is the mother of invention" is a silly proverb. "Necessity is the mother of futile dodges" is much closer to the truth. The basis of growth of modern invention is science, and science is almost wholly the outgrowth of pleasurable intellectual curiosity. -Alfred N. Whitehead ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
