termometro con diodo

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sapete come posso fare un termometro con arduino sfruttando le caratteristiche di un diodo al silicio in conduzione inversa?
non proprio da dove iniziare.
qualche mese fa l'ho fatto scuola riportando sul voltmetro la temperatura.
sinceramente ne prima ne ora avevo le idee chiare e vorrei approfondire il discorso con una esperienza.
ho comperato un saccoccio pieno di componenti misti 2/3 kg nuovi poco prezzo ci sono tanti diodi ma come li distinguo?

la tensione del diodo in polarizzazione diretta dipende dalla temperatura e varia di -1,7mv per grado centigrado. in pratica applichi una corrente costante e misuri la tensione sottraendo la tensione che ha 0 gradi. se non vuoi avere tensioni negative sottrai una tensione piú piccola.
 
http://www.fisica.unige.it/pls/linea1/2008-scuolaestiva_diodo-temperatura.pdf
ciao uwe


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