Sensore di umidità e conduttività del terreno

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salve tutti,
volevo sapere se qualcuno di voi aveva da suggerirmi un buon sensore di umidità e di conduttività del terreno da interfacciare con arduino. ovviamente devo ottenere dei valori in percentuale di acqua e resistenza.
pensiate che sia difficile reperirne qualcuno basso costo? massimo 20€ l uno...
su internet ho cercato qualcosa ma non é chiaro come io possa risalire ai dati precedentemente illustrati... vorrei evitare di tarare io sensori...
grazie mille per la disponibilità
a presto

david

ciao,
non se avevi già visto per esempio questi:
http://www.seeedstudio.com/depot/grove-moisture-sensor-p-955.html
http://www.amazon.it/acquisto-moisture-sensor-sensore-umidit%c3%a0/dp/b00iy8elq4/ref=sr_1_2?ie=utf8&qid=1396337111&sr=8-2&keywords=moisture+sensor#productdetails
qui è indicato anche un semplice sketch per usarli:
http://seeedstudio.com/wiki/grove_-_moisture_sensor
per ottenere giusti valori dovrai comunque fare qualche misura e qualche calcolo (tutto tramite software), anche se nella pagina che ho linkato per ultimo ci sono delle specifiche tecniche dalle quali dovresti riuscire ricavare quello che ti serve.


Arduino Forum > International > Italiano > Hardware (Moderator: leo72) > Sensore di umidità e conduttività del terreno


arduino

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