Is there any documentation regarding expected range of values? I am planning a series of exercises for a Raspberry Pi workshop. I am planning on using the GrovePi+ and sensors and output devices to teach some programming topics. One of the activities I am planning is to use the sound sensor and LEDs to create lights that flash to music. I am having difficulty getting usable values out of the sound sensor. Sampling the sensor in a fairly quiet room shows values around 240. When I turn on music on my iPhone a place the speaker next to the sound sensor, the values barely change at all.
Any advice on what values I should be seeing and if the sensor is not working?