I don't have a problem with Arduino... But I hope somebody here can help me... ;)
I try to log the temperature of my "main bed cave" with a LM35DZ and Arduino.
The vendor of the LM35DZ says: "Prec.Temp.Sensor 0..100´C -TO92". The LM35DZ datasheet says: "0mV + 10mV/°C / +2°C...+150°C" http://www.national.com/mpf/LM/LM35.html
It feels cold here (18°C) and indeed two LCD thermometers say 19°C. But I measure with a voltmeter 194mV at the LM35DZ and Diciemila, too (anaRef=INTERNAL).
2°C + 194mV / (10mV/°C) = 2°C + 19.4°C = 21.4°C What am I doing wrong?