On 10/4/11 8:03 AM, Kevin Rosenberg wrote:
So, if you know of any simple ADC to UART firmwares available, that'd
be great so he can just reference someone else's code. The picPET
is a perfect device at the perfect time. But, we can't rely on tvb
to come up with a 'picADC' at a similarly serendipitous time.
DATAQ
http://www.dataq.com/products/startkit/di145.html
$29, 4 channel 10 bit ADC with USB interface
You'll need to cobble up a sensor, of course, and I don't know if the
resolution of the di145 is good enough (20mV/LSB as I recall) for a
LM335 (10mV/Kelvin?). One thing you get with cheap is a +/- 10V full
scale range.
A thermistor and resistor into the DATAQ might work better.
Maxim/Dallas One-Wire devices are another possibility There's tons of
PIC code out there to interface to them. The sensors are cheap (few
bucks, depending on whether you buy raw device, or you get one potted
with a cable) Sparkfun.com has them, among other places.
There's also a whole raft of USB temperature loggers out there from
Onset (HOBO) or DataQ or a variety of other companies. They tend to run
in the $80 range (if someone knows about a battery powered temperature
logger in the under $25 range, I'd love to hear about it)
And, of course, a DMM with a RS-232 interface is another possibility
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