Sound Level Indicator is a module which can be used as an indicator of sound level or battery charge. This module is based on LM3914 Dot/Bar Display Driver that senses analog voltage levels and drives 10 LEDs, providing a linear analog display.
Operation:The module features an LM3914 IC along with 10 LEDs and two 2-pin White connectors. One white connector is used for power supply and another is for the positive and negative side of the microphone or any other device which’s sound or voltage level is to be monitored. When the sound or voltage level is maximum, all of the 10 LEDs will glow with full intensity.