docs: Add microphone.sound_level_db() function.
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docs/microphone.rst
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| @@ -70,6 +70,9 @@ Functions | |||
| * **return**: a representation of the sound pressure level in the range 0 to | |||
| 255. | |||
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| .. py:function:: sound_level_db() | |||
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| * **return**: a representation of the sound pressure level in decibels (dB). | |||
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Maybe it's worth specifying the range of dB values that will be returned? That could be useful to know how loud/quite sounds it can respond to, and also to perform some scaling on the number to make it suitable, eg, for plotting to the display.
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@JohnVidler do you know what the min and max value for LevelDetectorSPL are for dB?
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35-100dB, by default, although they are defined in LEVEL_DETECTOR_SPL_8BIT_000_POINT and LEVEL_DETECTOR_SPL_8BIT_255_POINT if you want to future proof against wider ranges on future devices
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I thought those were used only to calculate the 8-bit conversion. Are the min and max values from LevelDetectorSPL::getValue(LEVEL_DETECTOR_SPL_DB) also clamped to those?
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A quick test printing uBit.audio.levelSPL->getValue(LEVEL_DETECTOR_SPL_DB) shows we can get values over 100. @JohnVidler could you check what are the theoretical min and max?
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https://microbit-micropython--803.org.readthedocs.build/en/803/microphone.html#microbit.microphone.sound_level_db