Interfacing MAX9814 Electret Microphone Amplifier Module with Arduino

MAX9814 Microphone Module Features

Microphone AGC amplifier module, based on MAX9814 chip, has a 2.7V to 5.5V power supply. This device features a built-in low-noise microphone bias. This module can also be connected directly to AUX output.
The module’s output is not zero in silent mode and has an offset 1.25V.

MAX9814 Microphone Module Pinout

This module has 5 pins:

  •  VCC: Module power supply – 2.7-5.5 V
  •  GND: Ground
  •  OUT: Analog data output to the microcontroller
  •  Gain: Adjusting maximum module output*
  • AR: Adjusting module accuracy*
Disconnected VCC GND *
60dB 50dB 40dB Gain
1:4000 1:2000 1:500 AR
You can see pinout of this module in the image below.
You can download the datasheet of this module here.

Required Materials

Hardware Components

Arduino UNO R3 × 1
MAX9814 Microphone AGC Amplifier Module × 1
Male to Female jumper wire × 1

Software Apps

Arduino IDE

Interfacing MAX9814 Module with Arduino

Step 1: Circuit

The following circuit shows how you should connect Arduino to MAX9814 module. Connect wires accordingly.

Step 2: Code

Upload the following code to your Arduino.
  modified on Sep 8, 2020
  Modified by MohammedDamirchi from Arduino Examples
*/ // the setup routine runs once when you press reset: void setup() { // initialize serial communication at 9600 bits per second: Serial.begin(9600); } // the loop routine runs over and over again forever: void loop() { // read the input on analog pin 0: int sensorValue = analogRead(A0); // print out the value you read: Serial.println(sensorValue); }
After running the code, you will see the following image in the serial output.
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Comments (3)

  • John Paredes Reply

    Hey, I’m looking to buy the MAX9814 Electret Microphone Amplifier for a project and was wondering if this reads in dB or Hz for the y-axis in the example plot shown above? I hope to hear back and thank you!

    February 28, 2022 at 11:51 pm
    • Mehran Maleki Reply

      The output of this module is a voltage signal proportional to the dB level of the sound. If you want to measure the frequency, you can apply FFT algorithm on the output voltage of the MAX8914 module.

      March 2, 2022 at 6:45 am
  • Anton Reply

    Fabulous! It’s working, thanks! 🙂 🙂

    February 15, 2023 at 6:01 pm

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