Libelium Smart Cities PRO Technical Manual page 47

Sensors
Finally, the Noise Level Sensor can be installed outdoors in a streetlight or directly on a wall. The protection cover
should be placed like the pictures below, to protect the Sound Level Sensor probe from the rain.
Figure: Installing the Noise Level Sensor on a wall
Notice that the power supply cable has a waterproof end, suitable for outdoor applications. But, on the other side,
it has a non-waterproof end thought to be connected to a USB charger (AC/DC, 5 V output). Bear in mind that this
end is not waterproof so it cannot be used outdoors. Please protect it accordingly.
A typical application is to power a node placed on the facade of a building; the power supply cables go indoors
through a nearby window and the USB ends remain indoors, connected to a wall adapter. Many lampposts also
have a 220 V output inside.
Figure: Typical installation of the Noise Level Sensor
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