Dew sensor by LM358

Dew (condensed moisture) ad- versely affects the normal per- formance of sensitive electronic devices. A low-cost circuit described here can be used to switch off any gadget automatically in case of excessive humidity. At the heart of the circuit is an inexpensive (resistor type) dew sensor element.

Read more original source:
http://www.electronicsforu.com/efylinux/circuit/cir121.htm

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