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[forster at ozonline.com.au]

Thanks Mike

These 2 links use the 3 terminal device LM35D, its advantage is that its output is linear and calibrated, its disadvantage is that it requires +5V from the USB socket

> http://www.flickr.com/photos/curiouslee/sets/72157631756048008/with/8081515681/
> http://www.reducativa.com/xo/man-sis-sensoresdetemperatura.pdf

I chose to use a 2 terminal thermistor at
http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors#Measuring_Temperature

Not needing a USB connector, it is safer for the XO and lower component cost, the disadvantage is that it is nonlinear. The need to use a calibration function is not as much a disadvantage as it may seem, its another learning experience for the kids.

Tony