Vibration and Sound measurement through LCD
Topic: Vibration and Sound measurement through LCD
(Read 6047 times)
Per aspera ad astra.
Re: Vibration and Sound measurement through LCD
Apr 22, 2013, 06:39 pm
Because sensor outputs AC , up to 90 V. Arduino can only measure in 0 - +5 V. So you need to rescale / shrink input down, and rectify AC to DC before you connecting it to analog input.
To shrink input voltage is easy part, you just have to connect a resistor in parallel with sensor, 1k - 1 MoHm depends on sensitiity. Than you need to rectify AC to DC, in hardware - using LM3914 chip, or in software - in similar way to audio VU meter.