WSEGQ7 / NeoMatrix Arduino

#include <Adafruit_NeoPixel.h>
#include <avr/power.h>

#define PIN 6

int analogPin = 0; // read from multiplexer using analog input 0
int strobePin = 2; // strobe is attached to digital pin 2
int resetPin = 3; // reset is attached to digital pin 3
int spectrumValue[7]; // to hold a2d values
int lightValue[5];  // resized array

Adafruit_NeoPixel strip = Adafruit_NeoPixel(64, PIN, NEO_GRB + NEO_KHZ800);

void setup()
{
 Serial.begin(9600);
 pinMode(analogPin, INPUT);
 pinMode(strobePin, OUTPUT);
 pinMode(resetPin, OUTPUT);
 analogReference(DEFAULT);

 digitalWrite(resetPin, LOW);
 digitalWrite(strobePin, HIGH);

 Serial.println("MSGEQ7 test by J Skoba");

  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}

void loop()
{
  int ledValue, grnVal, redVal, tmpVal, intensity;
  uint32_t c;
  digitalWrite(resetPin, HIGH);
  digitalWrite(resetPin, LOW);

  for (int i = 0; i < 7; i++){
    digitalWrite(strobePin, LOW);
    delayMicroseconds(30); // to allow the output to settle
    spectrumValue[i] = analogRead(analogPin);

    Serial.print("\t");
    Serial.print(spectrumValue[i]);

    digitalWrite(strobePin, HIGH);
  } // for i
  Serial.println();

  // Update LEDs
  for(int i=0;i<7;i++){

    if(spectrumValue[i] > 127){
      tmpVal = spectrumValue[i];
    } else{
      tmpVal = 0;
    }

    ledValue = map(tmpVal, 0, 1023-50, 0, 255);
    intensity = map(tmpVal, 0, 1023-50, 0, 7);

    c = Wheel(ledValue); //strip.Color(0,0,Wheel(ledValue) );
    for(int j=0;j<8;j++){
      if( j<intensity){
        strip.setPixelColor(j+(8*i), c );
      } else{
        strip.setPixelColor(j+(8*i), strip.Color(0,0,0) );
      }
    } // for j
  }
  strip.show();
  delay(50); // helps smooth the update flicker a bit


}


// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if(WheelPos < 85) {
    /* 1
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
    */
    WheelPos -= 170;
    return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);

  } else if(WheelPos < 170) {
    /* 2
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
    */

    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  } else {
    /* 3
    WheelPos -= 170;
    return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
    */
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
}