Audio Blink

This lessons aims to show how to make an Audio Blink.

Jun 15, 2016

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audio

Devices & Components

Arduino Leonardo with Headers

General Purpose Dual Op-Amp

Resistor 10k ohm

Resistor 1M ohm

Breadboard (generic)

MSGEQ7

Resistor 100k ohm

WS2812B Addressable LED with Heat Sink

Capacitor 100 nF

Capacitor 1 µF

Project description

Code

Code snippet #1

arduino

1/*Arduino Audio Blink
2The WS2812 LEDs will blink in base of your voice!   Try it and have fun!
3Author: Arturo Guadalupi <a.guadalupi@arduino.cc>*/
4#include   <Adafruit_NeoPixel.h>
5const int msg7RESET = 2;
6const int msg7Strobe = 4;
7const   int msg7DCout = A0;
8const int PIN = 3;
9const int NUMPIXELS = 15; //number   of LEDs
10int spectrumRead[7] = {0}; //variable uded to store the analog values   from the MSGEQ7
11int i; //variable used as index in the sketch
12// Parameter   1 = number of pixels in strip
13// Parameter 2 = Arduino pin number (most are valid)
14//   Parameter 3 = pixel type flags, add together as needed:
15//   NEO_KHZ800  800   KHz bitstream (most NeoPixel products w/WS2812 LEDs)
16//   NEO_KHZ400  400 KHz   (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
17//   NEO_GRB     Pixels   are wired for GRB bitstream (most NeoPixel products)
18//   NEO_RGB     Pixels   are wired for RGB bitstream (v1 FLORA pixels, not v2)
19Adafruit_NeoPixel strip   = Adafruit_NeoPixel(60, PIN, NEO_GRB + NEO_KHZ800);
20void setup() {
21  strip.begin();
22   strip.show(); // Initialize all pixels to 'off'
23  //Pins used to drive the   MSGEQ7
24  pinMode(msg7RESET, OUTPUT);
25  pinMode(msg7Strobe, OUTPUT);
26}
27void   loop() {
28  readMSGEQ7(); //read bands value
29  //                    R                                      G   B   DELAY
30  colorWipe(strip.Color(map(spectrumRead[2], 0, 1023, 0, 100), 0,   0), map(spectrumRead[2], 0, 1023, 0, 3));
31  //                    R  G  B                                       DELAY
32   colorWipe(strip.Color(0, 0, map(spectrumRead[3], 0, 1023, 0, 100)), map(spectrumRead[3],   0, 1023, 0, 3));
33}
34//Code used to get the analog values from the MSGEQ7. See   datasheet for further informations
35void readMSGEQ7()
36{
37  digitalWrite(msg7RESET,   HIGH); // reset the MSGEQ7's counter
38  delay(5);
39  digitalWrite(msg7RESET,   LOW);
40  for (i = 0; i < 7; i++) {
41    digitalWrite(msg7Strobe, LOW); // output   each DC value for each freq band
42    delayMicroseconds(35); // to allow the output   to settle
43    spectrumRead[i] = analogRead(msg7DCout);
44    digitalWrite(msg7Strobe,   HIGH);
45  }
46}
47// Fill the dots one after the other with a color
48void   colorWipe(uint32_t c, uint8_t wait) {
49  for (uint16_t i = 0; i < strip.numPixels();   i++) {
50    strip.setPixelColor(i, c);
51    strip.show();
52  }
53  delay(wait);
54}

/*Arduino Audio Blink
The WS2812 LEDs will blink in base of your voice!   Try it and have fun!
Author: Arturo Guadalupi <a.guadalupi@arduino.cc>*/
#include   <Adafruit_NeoPixel.h>
const int msg7RESET = 2;
const int msg7Strobe = 4;
const   int msg7DCout = A0;
const int PIN = 3;
const int NUMPIXELS = 15; //number   of LEDs
int spectrumRead[7] = {0}; //variable uded to store the analog values   from the MSGEQ7
int i; //variable used as index in the sketch
// Parameter   1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
//   Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800   KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz   (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels   are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels   are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip   = Adafruit_NeoPixel(60, PIN, NEO_GRB + NEO_KHZ800);
void setup() {
  strip.begin();
   strip.show(); // Initialize all pixels to 'off'
  //Pins used to drive the   MSGEQ7
  pinMode(msg7RESET, OUTPUT);
  pinMode(msg7Strobe, OUTPUT);
}
void   loop() {
  readMSGEQ7(); //read bands value
  //                    R                                      G   B   DELAY
  colorWipe(strip.Color(map(spectrumRead[2], 0, 1023, 0, 100), 0,   0), map(spectrumRead[2], 0, 1023, 0, 3));
  //                    R  G  B                                       DELAY
   colorWipe(strip.Color(0, 0, map(spectrumRead[3], 0, 1023, 0, 100)), map(spectrumRead[3],   0, 1023, 0, 3));
}
//Code used to get the analog values from the MSGEQ7. See   datasheet for further informations
void readMSGEQ7()
{
  digitalWrite(msg7RESET,   HIGH); // reset the MSGEQ7's counter
  delay(5);
  digitalWrite(msg7RESET,   LOW);
  for (i = 0; i < 7; i++) {
    digitalWrite(msg7Strobe, LOW); // output   each DC value for each freq band
    delayMicroseconds(35); // to allow the output   to settle
    spectrumRead[i] = analogRead(msg7DCout);
    digitalWrite(msg7Strobe,   HIGH);
  }
}
// Fill the dots one after the other with a color
void   colorWipe(uint32_t c, uint8_t wait) {
  for (uint16_t i = 0; i < strip.numPixels();   i++) {
    strip.setPixelColor(i, c);
    strip.show();
  }
  delay(wait);
}

Code snippet #1

arduino

1/*Arduino Audio Blink
2The WS2812 LEDs will blink in base of your voice!  Try it and have fun!
3Author: Arturo Guadalupi <a.guadalupi@arduino.cc>*/
4#include  <Adafruit_NeoPixel.h>
5const int msg7RESET = 2;
6const int msg7Strobe = 4;
7const  int msg7DCout = A0;
8const int PIN = 3;
9const int NUMPIXELS = 15; //number  of LEDs
10int spectrumRead[7] = {0}; //variable uded to store the analog values  from the MSGEQ7
11int i; //variable used as index in the sketch
12// Parameter  1 = number of pixels in strip
13// Parameter 2 = Arduino pin number (most are valid)
14//  Parameter 3 = pixel type flags, add together as needed:
15//   NEO_KHZ800  800  KHz bitstream (most NeoPixel products w/WS2812 LEDs)
16//   NEO_KHZ400  400 KHz  (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
17//   NEO_GRB     Pixels  are wired for GRB bitstream (most NeoPixel products)
18//   NEO_RGB     Pixels  are wired for RGB bitstream (v1 FLORA pixels, not v2)
19Adafruit_NeoPixel strip  = Adafruit_NeoPixel(60, PIN, NEO_GRB + NEO_KHZ800);
20void setup() {
21  strip.begin();
22  strip.show(); // Initialize all pixels to 'off'
23  //Pins used to drive the  MSGEQ7
24  pinMode(msg7RESET, OUTPUT);
25  pinMode(msg7Strobe, OUTPUT);
26}
27void  loop() {
28  readMSGEQ7(); //read bands value
29  //                    R                                      G  B   DELAY
30  colorWipe(strip.Color(map(spectrumRead[2], 0, 1023, 0, 100), 0,  0), map(spectrumRead[2], 0, 1023, 0, 3));
31  //                    R  G  B                                       DELAY
32  colorWipe(strip.Color(0, 0, map(spectrumRead[3], 0, 1023, 0, 100)), map(spectrumRead[3],  0, 1023, 0, 3));
33}
34//Code used to get the analog values from the MSGEQ7. See  datasheet for further informations
35void readMSGEQ7()
36{
37  digitalWrite(msg7RESET,  HIGH); // reset the MSGEQ7's counter
38  delay(5);
39  digitalWrite(msg7RESET,  LOW);
40  for (i = 0; i < 7; i++) {
41    digitalWrite(msg7Strobe, LOW); // output  each DC value for each freq band
42    delayMicroseconds(35); // to allow the output  to settle
43    spectrumRead[i] = analogRead(msg7DCout);
44    digitalWrite(msg7Strobe,  HIGH);
45  }
46}
47// Fill the dots one after the other with a color
48void  colorWipe(uint32_t c, uint8_t wait) {
49  for (uint16_t i = 0; i < strip.numPixels();  i++) {
50    strip.setPixelColor(i, c);
51    strip.show();
52  }
53  delay(wait);
54}

/*Arduino Audio Blink
The WS2812 LEDs will blink in base of your voice!  Try it and have fun!
Author: Arturo Guadalupi <a.guadalupi@arduino.cc>*/
#include  <Adafruit_NeoPixel.h>
const int msg7RESET = 2;
const int msg7Strobe = 4;
const  int msg7DCout = A0;
const int PIN = 3;
const int NUMPIXELS = 15; //number  of LEDs
int spectrumRead[7] = {0}; //variable uded to store the analog values  from the MSGEQ7
int i; //variable used as index in the sketch
// Parameter  1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
//  Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800  KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz  (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels  are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels  are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip  = Adafruit_NeoPixel(60, PIN, NEO_GRB + NEO_KHZ800);
void setup() {
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
  //Pins used to drive the  MSGEQ7
  pinMode(msg7RESET, OUTPUT);
  pinMode(msg7Strobe, OUTPUT);
}
void  loop() {
  readMSGEQ7(); //read bands value
  //                    R                                      G  B   DELAY
  colorWipe(strip.Color(map(spectrumRead[2], 0, 1023, 0, 100), 0,  0), map(spectrumRead[2], 0, 1023, 0, 3));
  //                    R  G  B                                       DELAY
  colorWipe(strip.Color(0, 0, map(spectrumRead[3], 0, 1023, 0, 100)), map(spectrumRead[3],  0, 1023, 0, 3));
}
//Code used to get the analog values from the MSGEQ7. See  datasheet for further informations
void readMSGEQ7()
{
  digitalWrite(msg7RESET,  HIGH); // reset the MSGEQ7's counter
  delay(5);
  digitalWrite(msg7RESET,  LOW);
  for (i = 0; i < 7; i++) {
    digitalWrite(msg7Strobe, LOW); // output  each DC value for each freq band
    delayMicroseconds(35); // to allow the output  to settle
    spectrumRead[i] = analogRead(msg7DCout);
    digitalWrite(msg7Strobe,  HIGH);
  }
}
// Fill the dots one after the other with a color
void  colorWipe(uint32_t c, uint8_t wait) {
  for (uint16_t i = 0; i < strip.numPixels();  i++) {
    strip.setPixelColor(i, c);
    strip.show();
  }
  delay(wait);
}

Downloadable files

Schematic #1

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