Alan numitron clock
SNES Pi Webserver
USB Volume/USB toys
SNES Arcade cabinet
Game boy projects
Home Presence Detector
Rand Nerd Tut
Carnet du maker (fr)
ATmel blog (defunct)
Arduino and a thermometer
LM35 from National (Panasonic electronic branch).
Feed the baby with anything between 0 and 35 V (!), you get a reading between -1 and %206V on the Vout pin (in basic mode, most likely what you need; see pdf for other possibilities).
Reading returns %200.01v per degree above 0. Convert to Celsius degrees like that :
val = analogRead(potPin); //read the value of sensor temperature = (5*val*100/1024); //convert voltage to temperature
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