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Topic: Vibration and Sound measurement through LCD (Read 7312 times) previous topic - next topic


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.

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