Shhhhhhhhhh! ambient sound sensor

Team: Xuan, Rhea, Hannah, Micah

Update

The code is working and the lights are reactive to sound. Unfortunately, the fill lights in the background are not working, there may be a wiring issue. It will have to be looked into later.

Previous

It doesn’t quite work, but it will soon! We were pretty ambitious with the design of this project and perhaps aimed a bit too high for the “rough prototype” level. But it’s just so pretty and we’re pretty proud. Below are the pictures of the prototype of the model:

And here is the updated code:

#include 

int outputPins[] = {3,5,6,9,10,11};

#define BRIGHTNESS 50
#define NUM_ZONES_TOT 5

// dynamic zones
#define NUM_DLEDS 3
#define NUM_DZONES 4

Adafruit_NeoPixel strip0 = Adafruit_NeoPixel(NUM_DLEDS, outputPins[0], NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel strip1 = Adafruit_NeoPixel(NUM_DLEDS, outputPins[1], NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel strip2 = Adafruit_NeoPixel(NUM_DLEDS, outputPins[2], NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel strip3 = Adafruit_NeoPixel(NUM_DLEDS, outputPins[3], NEO_GRB + NEO_KHZ800);

// static zones
#define NUM_SLEDS 6
#define NUM_SZONES 2
Adafruit_NeoPixel strip4 = Adafruit_NeoPixel(NUM_SLEDS, outputPins[4], NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel strip5 = Adafruit_NeoPixel(NUM_SLEDS, outputPins[5], NEO_GRB + NEO_KHZ800);

const int sampleWindow = 50; // Sample window width in mS (50 mS = 20Hz)
unsigned int sample;
const int analogIn = A0;

uint16_t numPix[] = {strip0.numPixels(),strip1.numPixels(),
strip2.numPixels(),strip3.numPixels(),strip4.numPixels(),strip5.numPixels()};
Adafruit_NeoPixel striparray[] = {strip0,strip1,strip2,strip3,strip4,strip5};

unsigned int signalMax = 500;
unsigned int signalMin = 1024;

//color arrays
int r[] = {241,226,238,255};
int g[] = {117,72,39,0};
int b[] = {173,155,99,0};

void setup() 
{
  Serial.begin(9600);

// initialize strips to off
  for(int s = 0; s < NUM_ZONES_TOT; s++)
  {
    striparray[s].setBrightness(BRIGHTNESS);
    striparray[s].begin();
    striparray[s].show();
  }
}

void loop() 
{
   int sample = soundSample(); //take sound measurement w/ mic
   int nz = map(sample,500,1020,0,NUM_DZONES+1); //map sample value onto dynamic zones
   outputResponse(nz);
   if(sample == 900) {
      blinkStrip();
   }
}

int soundSample()
{
  unsigned long startMillis= millis();  // Start of sample window
   unsigned int peakToPeak = 0;   // peak-to-peak level

   // collect data for 50 mS
   while (millis() - startMillis < sampleWindow)
   {
      sample = analogRead(0);
      if (sample < 1024)  // toss out spurious readings       {          if (sample > signalMax)
         {
            signalMax = sample;  // save just the max levels
         }
         else if (sample < signalMin)
         {
            signalMin = sample;  // save just the min levels
         }
      }
   }
   peakToPeak = signalMax - signalMin;  // max - min = peak-peak amplitude
   return sample;
}

void outputResponse(int numZones)
{
    int index = numZones - 1;
    
    //set all dynamic pixels to off
    for(int z = 0; z < NUM_DZONES; z++)      {     turnOffStrip(z);      }    //but... if numZones > 0, turn on the corresponding zone
   if(numZones > 0) 
    {
   for(int p = 0; p < numPix[index]; p++)
   {
    //set pixel color to corresponding color
    striparray[index].setPixelColor(p, striparray[index].Color(r[index],g[index],b[index]));
   } 
    }

    //set background color
    updateBackground(index);
    
   //update all zones
   for(int z = 0; z < NUM_ZONES_TOT; z++)
   {
   striparray[z].show();
   }
}

// blink the fourth strip 3 times
void blinkStrip()
{
  for(int count = 0; count < 3; count++)
  {
  turnOffStrip(3);
  striparray[3].show();
  delay(1000);
  for(int p = 0; p < numPix[3]; p++)
  {
    striparray[3].setPixelColor(p, striparray[3].Color(255,0,0));
  }
  striparray[3].show();
  delay(1000);
  }
}

//set pixels to off in a certain LED strip
void turnOffStrip(int stripNum)
{
    for(int p = 0; p < numPix[stripNum]; p++) 
     {
      striparray[stripNum].setPixelColor(p, striparray[stripNum].Color(0,0,0)); 
     }
}

//update background color to reflect noise levels
void updateBackground(int index)
{
  for(int p = 0; p < NUM_SLEDS; p++)
  {
    striparray[4].setPixelColor(p,striparray[4].Color(r[index],g[index],b[index]));
    striparray[5].setPixelColor(p,striparray[5].Color(r[index],g[index],b[index]));
  }
}

Code outline:

• • Electret Microphone Sensor detects ambient noise levels and returns an analog value.
  • The analog value is mapped to a noise level between 1 and 4.
  • This tells the outputResponse function to trigger the in the corresponding zone. It also tells all relevant strips which color to be, which changes with the noise level.
  • At the highest noise level, the finger and background blink three times to catch the attention of the room.

This product is perfect for office spaces or college dorms, where conversations can spike in volume without anyone really noticing… until someone (a cop? a grumpy roommate? a disgruntled classmate?) comes to tell to shhhhhhhhhh!