Frank, good to see you at ETHOS (here is a quick video I took of the Sunday
outdoor stove demo session http://youtu.be/KuJLf2ALMG4) and I agree that we
have a need for something like this for fuel drying applications (such as when
trying to prepare batches of feedstocks with a consistent moisture content -
e.g. for use at regional stove testing labs. Here is what I have experience
with, or found available:
* I couldn't track down much at all about those oven sensors - either
some sensor characteristics, or sources of them that might provide some
description of what they are or how they work - so I worry that we won't be
able to find enough info on their associated circuitry to use them easily (but
the big ferrite magnets found in each oven are well worth harvesting).
* When I was doing medical device development we used Sensirion's super
quality SHT line of tiny CMOS sensors (they throw in a DTS temperature sensor
for free), but while they are now a tenth of what we paid for them... they are
still ~$25 at places like Sparkfun. For the same price, or much less, you can
get consumer-grade weather station "instruments" complete with remote LCD
readouts.
* This bare sensor example caught my eye because its is so absurdly
cheap ($3-$6) and often readily available -
http://www.amazon.com/Virtuabotix-DHT11-Digital-Temperature-Humidity/dp/B0066YD3GM.
You need some circuitry to use it or any other one, but hackers have
published exactly how to do it using a variety of microprocessor platforms -
for computer-aided data logging: http://embedded-lab.com/blog/?p=4333
If anyone can suggest alternative methods (and applications for them in our
arena) then I'd like to hear about them. Or about experiences with inexpensive
drying in bulk of things like wood chips, for TLUDs or similar.
Charlie_______________________________________________
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