On Tuesday 12 June 2012 14:36:52 andy pugh wrote: > On 12 June 2012 12:55, Ed Nisley <ed.08.nis...@pobox.com> wrote: > > > A quick glance at the search results suggests that the combination of > > "thermocouple" and "usb" runs about $100 direct from China and *much* > > more than that from a reputable supplier. > > A K-type thermocouple gives you 40uV/K > For 150C above the cold-junction that is 6mV. > I found a 16-bit ADC with an 8x pre-amp and +/- 2.048V so that gives a > resolution of 8uV. So that would give a temperature resolution of 0.2C > It samples 15 times a second, and has I2C. At that sort of data rate > parallel-port bit-banging the I2C ought to be fairly trivial. > I have a breakout board with a AD7718 http://www.analog.com/en/analog-to-digital-converters/ad-converters/ad7718/products/product.html connected to a FT4232H mini module board in spi mode. Software uses libmpsse and up to now I can read the id register.
Joachim ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
