Hi,
I've never use sound sensors. But, in my next project i want to be able to measure dB.
I found one in sparkfun, which seems to fit, but i don't know if there's any better sensor in the market for my project.
If someone knows about this topic, please reply.
Thank you,
One of the outputs is "an analog representation of its amplitude."
You could read that with ADC input and convert the result to dB in software.
and how precise is it going to be ?
and how precise is it going to be ?
At the very best, 1 part in 1024, as that is the resolution of the ADC.
Yes, but how precise is it going to be in dB ?
Log scale quite non linear, dB = 20 * log( A ).
Log_scale.pdf (15.4 KB)
I'm sorry but I don't understand this log scale. Could you please explain how this logaritmic scale is going to affect the dB.
dB is the log scale.
Thank you, now I understand what you were saying. Let me ask you another question:
How precise is going to be the sensor ? I mean the accuracy
Not accurate, probably +- 5 dB, electret mic usually comes with a data sheet, where amplitude-frequency response specified over audio range. To get better, you 'd have to perform a calibration, but IMHO, in most cases it is not necessary for hobbyist project
Well, even the sensor it's not really accurate. I would try to work with it.
Thanks for all the help. I really aprecciate it.