url: http://escribe.com/health/thesilverlist/m61976.html CS>Re: CS development From: AScottSilver Date: Fri, 15 Aug 2003 21:34:14
> Hi Mike, > Is you web site on line now? Please post it when it is. I would > like to see the source code and details of the project. Pascal is > a lot of fun and more powerful than most people think. I'm very happy to see another person who appreciates Pascal! No, I haven't put anything on line yet - still waiting for the AD7791's. It has a simple 3-wire interface similar to the AD9835 DDS, so I'll probably copy the code I did for that project and change the I/O routines. > I use a variable DC power supply with resistive current limiting > and have found it to work well. I was an MCU applications engineer > for a while so I thought it would be an ideal application for > someone who wanted to put together the "ideal" CS generator. You > know, membrane keypad, LCD display, built in A/D and D/A > converters for checking initial conductivity and calculating final > PPM, etc. HeHe - the AD7791 takes 16.67 samples per second. If you allow 4 bytes for the 24-bit data, and do a 10 hr run, that's 16.67*3600*10*4 = 2,400,480 bytes of data. Add a 4-byte time stamp, and you have a lot of data. A bit too much for a simple MCU to store and crunch, I'm afraid. Most of the stuff I do these days ends up with 10 or 20 megabytes of data. Fortunately, I found a way to access all the Extended memory in one contiguous block from Pascal so I don't have to go through HiMem, which is painfully slow. Displaying the data is another problem. Most Windows programs choke on million-vector data files. So I now have my own routines in Pascal and assembly that just zip through the data and can do pretty much anything I want. > I guess that's overkill when a battery and a resistor (or a "grain > of wheat" lamp) will do the job just fine. Sure - it's great when you finally figure everything out and just want to make cs. I'm still trying to figure out what kind of electrode configuration, operating current, and quality of dw gives the highest ppm. Godzilla is the best so far, but it's not the final answer. > Best wishes, > Andy (^_^) Best Regards, Mike Monett -- The silver-list is a moderated forum for discussion of colloidal silver. Instructions for unsubscribing may be found at: http://silverlist.org To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
