LED Cloud

// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
// released under the GPLv3 license to match the rest of the AdaFruit NeoPixel library

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif

// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1
#define PIN 6

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 3

// When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals.
// Note that for older NeoPixel strips you might need to change the third parameter–see the strandtest
// example for more information on possible values.
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int delayval = 500; // delay for half a second
const int sampleWindow = 50; // Sample window width in mS (50 mS = 20Hz)
unsigned int sample;

void setup()
{
#if defined (__AVR_ATtiny85__)
if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
// End of trinket special code

pixels.begin();
pixels.show(); // Initialize all pixels to ‘off’

Serial.begin(9600);

}

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

unsigned int signalMax = 0;
unsigned int signalMin = 1024;

// collect data for 50 mS
while (millis() – startMillis < sampleWindow)
{
sample = analogRead(0);

delay(4);
if (sample < 600)
{
pixels.setPixelColor(0,pixels.Color(0,0,0));
pixels.setPixelColor(1,pixels.Color(0,0,0));
pixels.setPixelColor(2,pixels.Color(0,0,0));
pixels.show();

}

if (sample > 600)
{
pixels.setPixelColor(0,pixels.Color(0,255,0));
pixels.setPixelColor(1,pixels.Color(0,255,0));
pixels.setPixelColor(2,pixels.Color(0,255,0));
pixels.show();
Serial.println(sample);
delay (100);

}
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
double volts = (peakToPeak * 5.0) / 1024; // convert to volts

Serial.println(volts);
}