Sound Reactive LED Strip fueled by Gemma

[TeslaNiklas]

We built the kit similar to the LED drum set. We made a test with alligator clips and everything was working. Then we soldered. That's when the trouble started. We have tested the connections and everything is wired correctly and are getting power. We tested the arduino chip with "Blink" code and that is working too. We then took apart the points to the LED strip from the Arduino and have been able to reconnect only the white wire to the "D out" without the black wire spliced into the unit. The LEDs are burning solid now and the code does not seem to be working.

[Franklin97355]

Could you post large (less than 1meg,~800x600), clear, detailed pictures of both sides of your board showing any soldering you have done and the connections to it?

[TeslaNiklas]

It may look a little messy but the led strip is lighting but it's not sound reactive for some reason.There are some alligator clips for testing but we've soldered the mic but not the led strip.Here are the pictures!

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[TeslaNiklas]

P7221328.jpg (60.18 KiB) Viewed 311 times

P7221313 (1).jpg (86.58 KiB) Viewed 311 times

[Franklin97355]

Which strip are you using and could you post your code so we can take a look. Please use the code button "</>" or

Code: Select all

 tags when posting code to the forums.

[TeslaNiklas]

Code: Select all

/* LED "Color Organ" for Adafruit Trinket and NeoPixel LEDs.

Hardware requirements:
 - Adafruit Trinket or Gemma mini microcontroller (ATTiny85).
 - Adafruit Electret Microphone Amplifier (ID: 1063)
 - Several Neopixels, you can mix and match
   o Adafruit Flora RGB Smart Pixels (ID: 1260)
   o Adafruit NeoPixel Digital LED strip (ID: 1138)
   o Adafruit Neopixel Ring (ID: 1463)

Software requirements:
 - Adafruit NeoPixel library

Connections:
 - 5 V to mic amp +
 - GND to mic amp -
 - Analog pinto microphone output (configurable below)
 - Digital pin to LED data input (configurable below)

Written by Adafruit Industries.  Distributed under the BSD license.
This paragraph must be included in any redistribution.
*/
#include <Adafruit_NeoPixel.h>

#define N_PIXELS  15  // Number of pixels you are using
#define MIC_PIN    2  // Microphone is attached to Trinket GPIO #2/Gemma D2 (A1)
#define LED_PIN    0  // NeoPixel LED strand is connected to GPIO #0 / D0
#define DC_OFFSET  0  // DC offset in mic signal - if unusure, leave 0
#define NOISE     0  // Noise/hum/interference in mic signal
#define SAMPLES   60  // Length of buffer for dynamic level adjustment
#define TOP       (N_PIXELS +1) // Allow dot to go slightly off scale
// Comment out the next line if you do not want brightness control or hav

byte
  peak      = 0,      // Used for falling dot
  dotCount  = 0,      // Frame counter for delaying dot-falling speed
  volCount  = 0;      // Frame counter for storing past volume data
  
int
  vol[SAMPLES],       // Collection of prior volume samples
  lvl       = 10,     // Current "dampened" audio level
  minLvlAvg = 0,      // For dynamic adjustment of graph low & high
  maxLvlAvg = 512;

Adafruit_NeoPixel  strip = Adafruit_NeoPixel(N_PIXELS, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  memset(vol, 0, sizeof(vol));
  strip.begin();
}
void loop() {
  uint8_t  i;
  uint16_t minLvl, maxLvl;
  int      n, height;
  n   = analogRead(MIC_PIN);                 // Raw reading from mic 
  n   = abs(n - 512 - DC_OFFSET);            // Center on zero
  n   = (n <= NOISE) ? 0 : (n - NOISE);      // Remove noise/hum
  lvl = ((lvl * 7) + n) >> 3;    // "Dampened" reading (else looks twitchy)
  
  // Calculate bar height based on dynamic min/max levels (fixed point):
  height = TOP * (lvl - minLvlAvg) / (long)(maxLvlAvg - minLvlAvg);

  if(height < 0L)       height = 0;      // Clip output
  else if(height > TOP) height = TOP;
  if(height > peak)     peak   = height; // Keep 'peak' dot at top

// if POT_PIN is defined, we have a potentiometer on GPIO #3 on a Trinket 
//    (Gemma doesn't have this pin)
  uint8_t bright = 255;   
#ifdef POT_PIN            
   bright = analogRead(POT_PIN);  // Read pin (0-255) (adjust potentiometer 
                                  //   to give 0 to Vcc volts
#endif
  strip.setBrightness(bright);    // Set LED brightness (if POT_PIN at top
                                  //  define commented out, will be full)
  // Color pixels based on rainbow gradient
  for(i=0; i<N_PIXELS; i++) {  
    if(i >= height)               
       strip.setPixelColor(i,   0,   0, 0);
    else 
       strip.setPixelColor(i,Wheel(map(i,0,strip.numPixels()-1,30,150)));
    } 

   strip.show(); // Update strip

  vol[volCount] = n;                      // Save sample for dynamic leveling
  if(++volCount >= SAMPLES) volCount = 0; // Advance/rollover sample counter

  // Get volume range of prior frames
  minLvl = maxLvl = vol[0];
  for(i=1; i<SAMPLES; i++) {
    if(vol[i] < minLvl)      minLvl = vol[i];
    else if(vol[i] > maxLvl) maxLvl = vol[i];
  }
  // minLvl and maxLvl indicate the volume range over prior frames, used
  // for vertically scaling the output graph (so it looks interesting
  // regardless of volume level).  If they're too close together though
  // (e.g. at very low volume levels) the graph becomes super coarse
  // and 'jumpy'...so keep some minimum distance between them (this
  // also lets the graph go to zero when no sound is playing):
  if((maxLvl - minLvl) < TOP) maxLvl = minLvl + TOP;
  minLvlAvg = (minLvlAvg * 63 + minLvl) >> 6; // Dampen min/max levels
  maxLvlAvg = (maxLvlAvg * 63 + maxLvl) >> 6; // (fake rolling average)
}

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

[TeslaNiklas]

it worked thank you!
franklin97355