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Microcontroller Programming » Sound_Meter_LCD

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December 27, 2011 by Tohyj	Dear All, Does anyone know what the value from the piezoelectric sound level meter means ? For example, when you assembled the Piezoelectric sound level meter and start meansuring the sound level. You will see; MAX: 560+, Min: 580+, Diff: 20+. What do all these values means ? dB ? Regards, Tohyj
December 27, 2011 by treymd	I think 550+ dB might just take your head off! More than likely, the value displayed is a number, from 0 to 1023, representing the voltage output by the piezo. If the voltage at the VREF pin on the MCU is 5V, which it probably is, then this number is some division of 5V. 1023 being 5V, 0 being 0V, 512 being 2.5V. So the value output would represent amplitude, but likely not in decibels.

December 27, 2011
by Tohyj
Tohyj's Avatar

Dear All,

Does anyone know what the value from the piezoelectric sound level meter means ?

For example, when you assembled the Piezoelectric sound level meter and start meansuring the sound level.

You will see; MAX: 560+, Min: 580+, Diff: 20+.

What do all these values means ? dB ?

Regards, Tohyj

December 27, 2011
by treymd
treymd's Avatar

I think 550+ dB might just take your head off! More than likely, the value displayed is a number, from 0 to 1023, representing the voltage output by the piezo. If the voltage at the VREF pin on the MCU is 5V, which it probably is, then this number is some division of 5V. 1023 being 5V, 0 being 0V, 512 being 2.5V. So the value output would represent amplitude, but likely not in decibels.

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