Grove-Loudness Sensor-Based on amplifier LM2904&built-in microphone

Description

The Grove-Loudness Sensor is based on amplifier LM2904 and a built-in microphone and is designed to detect the loudness of environmental sound.

Features

• Upgraded functionality: Based on LM2904 — Dual, 36-V, 1.2-MHz operational amplifier with -40°C to 125°C operation
• Wide supply voltage range: In the range of 3.2V~5.2V
• Built-in signal filtering: Input signal will go through two times filtering inside the module
• Adjustable output gain: A screw potentiometer that enables manual adjustments to the output gain
• Grove unified socket: The product ensures “Plug and Play” and could be versatile for various applications of Grove

Description

The Grove-Loudness Sensor is designed to detect the loudness of environmental sound. Based on amplifier LM2904 and a built-in microphone, it amplifies and filters the high-frequency signal that is received from the microphone and outputs a positive envelope. This will make for Arduino’s signal acquisition. The output value depends on the level of the sound input. In order to avoid unnecessary signal disturbances, the input signal will go through two times filtering inside the module. Lastly, there is a screw potentiometer that enables manual adjustments to the output gain.

Comparisons

Details	Grove – Sound Sensor (LM358)	Grove-Loudness Sensor-Based on amplifier LM2904&built-in microphone	Grove – Analog Microphone (MEMS)
Image
Microphone	Electret Condenser Microphone	Electret Condenser Microphone	SiSonic MEMS Microphone
Price	$4.90	$5.9	$6.90
Voltage Range	4V – 12V	3.5V – 10V	1.5V – 3.6V
Operating Current	4mA – 5mA	/	5mA
Sensitivity	-60~-56dBV/Pa	-60~-56dBV/Pa	-25~-19dBV/Pa
Size of Microphone	Medium	Medium	Small
Amplifier	LM358	LM2904	MEMS
Quality of Microphone

One More Thing

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