Humidity and Temperature LCD Display with Power Saving Mode: Minimal parts, Fun, Quick, and Very Inexpensive
Since my study was not always at the best temperature, I decided it would be useful to display the ambient temperature on my desk. The cost of a sensor that provided humidity, in addition to temperature, was not prohibitive; therefore a display of humidity as well as temperature was included in this...By: R Jordan Kreindler
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[original story: Instructables]