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Esplora Microphone (Sound Sensor)

This sketch shows you how to read the microphone sensor. The microphone will range from 0 (total silence) to 1023 (really loud). It uses the sound level to set a brightness level for the green LED. When you're using the sensor's reading (for example, to set the brightness of the LED), you map the sensor's reading to a range between the minimum and the maximum.

Hardware Required

  • Arduino Esplora

Circuit

Only your Arduino Esplora is needed for this example. Connect the Esplora to your computer with a USB cable and open the Arduino's Serial Monitor.

Microphone to send data to your computer from the Esplora

Code

To send data to your computer, you need to open a serial connection. use Serial.begin() to open a serial port at 9600 baud on the Esplora.

The Esplora.readMicrophone() function gets the value from the microphone. It will give you a value between 0 and 1023.

To send the values to the Serial Monitor, you call Serial.print(). When the Esplora is connected, and the Serial Monitor is open, you should start to see values reported like this:

sound level: 172 Green brightness: 42
sound level: 74 Green brightness: 18
sound level: 153 Green brightness: 38
sound level: 67 Green brightness: 16
sound level: 93 Green brightness: 23
sound level: 110 Green brightness: 27


/*
  Esplora Sound Sensor
 
 This  sketch shows you how to read  the microphone sensor. The microphone
will range from 0 (total silence) to 1023 (really loud).  
 When you're using the sensor's reading (for example, to set the brightness
 of the LED), you map the sensor's reading to a range between the minimum
 and the maximum.
 
 Created on 22 Dec 2012
 by Tom Igoe
 
 This example is in the public domain.
 */


#include <Esplora.h>

void setup() {
  // initialize the serial communication:
  Serial.begin(9600);
}

void loop() {
  // read the sensor into a variable:
  int loudness = Esplora.readMicrophone();

  // map the sound level to a brightness level for the LED:
  int brightness = map(loudness, 0, 1023, 0, 255);
  // write the brightness to the green LED:
  Esplora.writeGreen(brightness);
 
 
    // print the microphone levels and the LED levels (to see what's going on):
    Serial.print("sound level: ");
    Serial.print(loudness);
    Serial.print(" Green brightness: ");
    Serial.println(brightness);
  // add a delay to keep the LED from flickering:
  delay(10);
}

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