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===Thermometer=== '''[http://en.wikipedia.org/wiki/Thermocouple Thermocouples (TCs)]''' Pros * Very robust, good for nasty environments * Wide temperature range (−200°C to +1350°C for type K) * Relatively cheap (approx. $15 for a DIY model incl. amplifier) Cons * Voltage is very small so requires an amplifier with digital out (41 µV/°C for type K) '''Digital Temperature Sensors (DTS)''' Pros * Avaliable as one-wire devices, use single digital pin * Require no amplification or moderation to connect to Arduino * Good precision in biological range ** ±0.5°C accuracy from –10°C to +85°C for DS1820 * Very cheap ($0.75 to $3.95) Cons * Comparatively limited temperature range ** –55°C to +125°C for DS1820 ** -40°C to +125°C for TC1047A * Accuracy only ±2°C for TC1047A at 25°C * Sensitive to mechanical damage and liquid, so require protection/casing '''Thermistors''' Pros * Single analog pin use * Very cheap ($1.75 from Hacktronics) Cons * Comparatively limited temperature range (-40°C to +125°C) * Accuracy approx. ±1°C at 25°C '''Commercial resources''' TCs * [http://www.omega.com/ppt/pptsc.asp?ref=HTTC36 Hollow Tube Thermocouple Probe] - $19 from Omega TC wire * [http://www.mcmaster.com/#type-k-thermocouple-wire/=bkaksl, both wires in a sheath] ~$1/foot, by the foot from McMaster Carr * Omega [http://www.omega.com/ppt/pptsc.asp?ref=SPIR&Nav=temh02 bare wire is here]. Omega is the ultimate source, but they seem to only sell it by the roll (25 foot minimum, buy both wires separately) or in the form of super nice manufactured probes ($) Amplifier * [http://www.sparkfun.com/products/307 TC amplifier] - $12 from Sparkfun DTS * [http://www.hacktronics.com/Sensors/Digital-Temperature-Sensor-DS18B20/flypage.tpl.html DS18B20 digital temperature sensor] - $3.95 from Hacktronics ** [http://www.datasheetarchive.com/pdf/getfile.php?dir=Datasheets-8&file=DSA-149089.pdf Datasheet for DS1820 1-wire DTS] * [http://us.element-14.com/jsp/displayProduct.jsp?sku=89C8093&CMP=KNC-KEY-SKU-MIC&s_kwcid=TC|20219|tc1047avnbtr||S|b|6383206454 TC1047A microchip] - $0.60 from element14 ** [http://www.datasheetarchive.com/pdf/getfile.php?dir=Datasheets-304&file=55284.pdf Datasheet for TC1047AVNBTR DTS microchip] Thermistor * [http://www.hacktronics.com/Sensors/Thermistor-Temperature-Sensor/flypage.tpl.html Thermistor] - $1.75 from Hacktronics ** [http://www.vishay.com/doc?29049 Datasheet for thermistor] '''Private resources''' * Charlie has access to a good amount of Type K metal sheathed TC wire, plus assorted probes and a TC reader he can donate - as we go along our improving expertise will lead us to resources other people can use... like the relatively cheap McMaster Carr wire. * We presently have a functional prototype digital thermometer which uses a DS18B20 DTS [[File:One-wire_prototype.jpg|200px|thumb|left|One-wire prototype]] '''Other resources''' * [http://www.instructables.com/id/Making-A-Thermocouple/ Instructable for how to build a thermocouple]. This soldering method will work with the Omega wire, and better junctions can be made with a welder or capacitive discharge. * [http://www.chinwah-engineering.com/USBThermocoupleProject.html USB Thermocouple Project]
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