<div dir="ltr"><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">I would recommend a thermocouple,</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif"><br></div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">cheep K type 0 - 1024 Cent.</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif"><br></div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">but according to Wikipedia (<a href="http://en.wikipedia.org/wiki/Thermocouple">http://en.wikipedia.org/wiki/Thermocouple</a>)</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">'T' Type can go down to -185 C.</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif"><br></div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">Normally I would use MAX6675, or MAX31855</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif"><br></div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">which is a bit expensive but the latter claims to go down to -270 C</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif"><br></div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">But I cannot test that :)</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif"><br></div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">also both chips have a digital interface, - no messy analogue. nice clean number :)</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif"><br></div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">I have one set up on some kit here if you got some dry ice (Ha,Ha,)</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">Cheers</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif"><br></div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif">Ceri</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 21, 2015 at 9:31 AM, David Rankin <span dir="ltr"><<a href="mailto:rankin.dc@gmail.com" target="_blank">rankin.dc@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi All,<br>
<br>
I am just messing around with my Audino and the temperature sensor. I<br>
am wondering if it is this is even possible but I am trying to measure<br>
low temperature sub -100Celsuis<br>
<br>
So being very niave I tried it out in dry ice but when the sensor got<br>
only got close to its limit, I took it out (-35).<br>
<br>
I also looked around for better sensors and found these:<br>
<a href="http://www.scientificinstruments.com/product-detail/model-si-440-silicon-diode-temperature-sensors/" target="_blank">http://www.scientificinstruments.com/product-detail/model-si-440-silicon-diode-temperature-sensors/</a><br>
<a href="http://www.scientificinstruments.com/product-detail/model-si-430-silicon-diode-temperature-sensors/" target="_blank">http://www.scientificinstruments.com/product-detail/model-si-430-silicon-diode-temperature-sensors/</a><br>
<br>
So what I was wondering. Is it even possible to put a aurdiono in a<br>
cold cold fridge and meassure low temprtures with a better sensor? If<br>
not why not?<br>
<br>
Any advice or guidance would be really helpful?<br>
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</blockquote></div><br></div>