SOUND sensor

Essential this sensor measures sound signal levels (not frequency). A key part of using this is adjusting the sensitivity via an on-board potentiometer. See link below for more information about the sound sensor along with examples that sample and plot data from it.

Sound sensor (FC-04) - "The FC-04 sound sensor module, in my opinion, is a very sensitive sound detection module for the price. Although this sensor does not provide any ability to identify specific sounds or the frequency of a sound it does do what it is supposed to - it detects sound.".

The article also describes the on-board potentiometer (POT) which controls how loud an input sound is required for the sensor to generates output (effectively its sensitivity). You will require a narrow edged tool, e.g. a screwdriver.

http://www.instructables.com/id/Simple-FC-04-Sound-Sensor-Demo/

Projects:

1. Sound - Basic plotting - Basic plot of the sound waves as I speak.
2. http://www.instructables.com/id/Pushing-the-FC-04-Sound-Sensor-to-Its-Limits/ - Nice little demonstration of sensor's signal level driving one or more LEDs in a bank (louder means more LEDs on). A "crowd pleaser" way of visualising music (volume). As the sound signal increases the LEDs giving a dynamic "bar chart" type effect, like a basic "graphic equaliser" display.