See 14 FM Bugs to Build!
Detects the presence of
water and produces different tones depending on the level of
water.
Transmits 1Km to an FM radio.
It can be used to monitor situations such as dams, basements and fields
ect. to determine the presence or absence of water. the set of probes on
the input will determine the level of water as it rises and the pitch of
the tome increases. It detects 3 different water levels: Low, Medium and
High.
It consumes very little power when sitting around and the batteries will
last for 3 to 6 months or more.
Board dimensions: 2.2in x 1.2in.
2 Page article.