/*
**********************************************************************
* Stereo VU Meter for 1 or 2 LED rings or strips build by ericBcreator
* Designed to be used with an Arduino UNO, Nano or compatible device.
**********************************************************************
* Last updated 20171105 by ericBcreator
*
* This code is free for personal use, not for commercial purposes.
* Please leave this header intact.
*
* contact: ericBcreator@gmail.com
**********************************************************************
*/
//#define DEBUG // for debugging
//
// include the NeoPixel library:
//
#include <Adafruit_NeoPixel.h>
//
// uncomment the definition for the connected strip or ring(s)
//
//#define led_ring_60
//#define led_strip_60
//#define led_strip_30
//#define led_2_rings_24
#define led_2_rings_30
//#define led_strip_200
//#define led_strip_144
//
// important setting: using potentiometer sensor values or not
// This setting has to be set right or the script will not work correctly:
// - set this to true if using potentiometers
// - set this to false if not using potentiometers
//
const int useSensorValues = true;
//
// setup pins
//
int leftPin = A0, rightPin = A1; // left audio in on analog 0, right on analog 1
int brightnessPin = A4, sensitivityPin = A5; // potentiometers for brightness and sensitivity on analog 4 and 5
int stripPin = 6; // DIN of leds on digital pin 6
int showPeaksPin = 7; // switch to toggle peaks on or off on digital pin 7
int momentarySwitch = false; // set false for an on/off toggle switch
//
// setup variables for the number of leds and led strip or 2 rings
//
#if defined (led_ring_60)
//settings for a 60 led ring
int stripNumOfLeds = 32; // the total number of leds 60 idi
uint32_t stripColor[17]; // half of the number of leds + 1 32 idi
int displayMiddleLed = false; // display the middle led (blue). set to true for one strip, false for two strips or rings
int splitStrip = true; // set to true when using 2 strips or rings, false for one strip
int middleOffset = 0; // offset for the middle led when using one strip
int startupAnimationDelay = 6; // delay for the startup animation
int orangeLimitAmount = 0; // limit the amount of green of the middle LEDs to make them more orange
int swapLeftRight = false; // swap the left and right input values or not
int dropDelay = 4; // hold time before dropping the leds
float dropFactor = .92; // value for dropping the leds
int peakTimeNoDropDelay = 250; // peak hold time when not dropping the peaks (set droppingPeak true or false)
int peakTimeFirstDropDelay = 130; // peak hold time when dropping the first peak
int peakTimeDropDelay = 7; // peak hold time when dropping the rest of the peaks
float peakDropFactor = .93; // value for dropping the peaks
int droppingPeakFade = false; // display the dropping peak fading to black or not
int bouncingPeaksNumOfLeds = 6; // how many leds to bounce up (max)
int bouncingPeakDelay = 4; // delay between peak bounce updates
int bouncingPeakCounterInc = 10; // increase counter for each bounce update. note: it uses a 0-180 sin function for the bouncing
#elif defined (led_strip_60)
//settings for a 60 led ring
int stripNumOfLeds = 60; // the total number of leds
uint32_t stripColor[31]; // half of the number of leds + 1
int displayMiddleLed = true; // display the middle led (blue). set to true for one strip, false for two strips or rings
int splitStrip = false; // set to true when using 2 strips or rings, false for one strip
int middleOffset = 1; // offset for the middle led when using one strip
int startupAnimationDelay = 6; // delay for the startup animation
int orangeLimitAmount = 0; // limit the amount of green of the middle LEDs to make them more orange
int swapLeftRight = false; // swap the left and right input values or not
int dropDelay = 4; // hold time before dropping the leds
float dropFactor = .92; // value for dropping the leds
int peakTimeNoDropDelay = 250; // peak hold time when not dropping the peaks (set droppingPeak true or false)
int peakTimeFirstDropDelay = 130; // peak hold time when dropping the first peak
int peakTimeDropDelay = 7; // peak hold time when dropping the rest of the peaks
float peakDropFactor = .93; // value for dropping the peaks
int droppingPeakFade = false; // display the dropping peak fading to black or not
int bouncingPeaksNumOfLeds = 6; // how many leds to bounce up (max)
int bouncingPeakDelay = 4; // delay between peak bounce updates
int bouncingPeakCounterInc = 10; // increase counter for each bounce update. note: it uses a 0-180 sin function for the bouncing
#elif defined (led_strip_30)
//settings for a 30 led strip
int stripNumOfLeds = 30; // the total number of leds
uint32_t stripColor[16]; // half of the number of leds + 1
int displayMiddleLed = true; // display the middle led (blue). set to true for one strip, false for two strips or rings
int splitStrip = false; // set to true when using 2 strips or rings, false for one strip
int middleOffset = 1; // offset for the middle led when using one strip
int startupAnimationDelay = 10; // delay for the startup animation
int orangeLimitAmount = 0; // limit the amount of green of the middle LEDs to make them more orange
int swapLeftRight = false; // swap the left and right input values or not
int dropDelay = 10; // hold time before dropping the leds
float dropFactor = .9; // value for dropping the leds
int peakTimeNoDropDelay = 250; // peak hold time when not dropping the peaks (set droppingPeak true or false)
int peakTimeFirstDropDelay = 150; // peak hold time when dropping the first peak
int peakTimeDropDelay = 15; // peak hold time when dropping the rest of the peaks
float peakDropFactor = .94; // value for dropping the peaks
int droppingPeakFade = false; // display the dropping peak fading to black or not
int bouncingPeaksNumOfLeds = 3; // how many leds to bounce up (max)
int bouncingPeakDelay = 4; // delay between peak bounce updates
int bouncingPeakCounterInc = 9; // increase counter for each bounce update. note: it uses a 0-180 sin function for the bouncing
#elif defined (led_2_rings_24)
//settings for 2 24 led rings
int stripNumOfLeds = 48;
uint32_t stripColor[25];
int displayMiddleLed = false;
int splitStrip = true;
int middleOffset = 0;
int startupAnimationDelay = 5;
int orangeLimitAmount = 0;
int swapLeftRight = false;
int dropDelay = 2;
float dropFactor = .96;
int peakTimeNoDropDelay = 250;
int peakTimeFirstDropDelay = 100;
int peakTimeDropDelay = 10;
float peakDropFactor = .94;
int droppingPeakFade = false;
int bouncingPeaksNumOfLeds = 3;
int bouncingPeakDelay = 4;
int bouncingPeakCounterInc = 9;
#elif defined(led_2_rings_30)
//settings for 2 30 led rings
int stripNumOfLeds = 60;
uint32_t stripColor[31];
int displayMiddleLed = false;
int splitStrip = true;
int middleOffset = 0;
int startupAnimationDelay = 5;
int orangeLimitAmount = 0;
int swapLeftRight = false;
int dropDelay = 2;
float dropFactor = .96;
int peakTimeNoDropDelay = 250;
int peakTimeFirstDropDelay = 100;
int peakTimeDropDelay = 10;
float peakDropFactor = .94;
int droppingPeakFade = false;
int bouncingPeaksNumOfLeds = 3;
int bouncingPeakDelay = 4;
int bouncingPeakCounterInc = 9;
#elif defined (led_strip_200)
//settings for a 200 led strip
int stripNumOfLeds = 200;
uint32_t stripColor[101];
int displayMiddleLed = false;
int splitStrip = true;
int middleOffset = 0;
int startupAnimationDelay = 1;
int orangeLimitAmount = 0;
int swapLeftRight = false;
int dropDelay = 10;
float dropFactor = .96;
int peakTimeNoDropDelay = 250;
int peakTimeFirstDropDelay = 100;
int peakTimeDropDelay = 30;
float peakDropFactor = .99;
int droppingPeakFade = false;
int bouncingPeaksNumOfLeds = 8;
int bouncingPeakDelay = 4;
int bouncingPeakCounterInc = 9;
#elif defined (led_strip_144)
//settings for a 200 led strip
int stripNumOfLeds = 145;
uint32_t stripColor[73];
int displayMiddleLed = true;
int splitStrip = false;
int middleOffset = 1;
int startupAnimationDelay = 1;
int orangeLimitAmount = 0;
int swapLeftRight = false;
int dropDelay = 10;
float dropFactor = .85;
int peakTimeNoDropDelay = 250;
int peakTimeFirstDropDelay = 100;
int peakTimeDropDelay = 5;
float peakDropFactor = .94;
int droppingPeakFade = false;
int bouncingPeaksNumOfLeds = 10;
int bouncingPeakDelay = 2;
int bouncingPeakCounterInc = 10;
#endif
//
// setup other variables, user editable
//
// basic settings
int minValue = 5; // min analog input value
int maxValue = 250; // max analog input value (0-1023 equals 0-5V)
int sensitivityValue = 255; // 0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
int maxSensitivity = 2 * 255; // let the 'volume' go up to 200%!
int ledBrightness = 30; // 0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
int sensorDeviationBrightness = 1; // eliminate fluctuating values
int overflowDelay = 20; // overflow hold time
// peak settings
int displayPeaks = true; // value will be set by the switch if useSensorValues = true
int droppingPeak = true; // display dropping peaks or not. note: displayPeaks has to be true
int bouncingPeaks = true; // display bouncing peaks or not. note: displayPeaks has to be true
//
// initialize other variables needed for the sketch
//
int numOfSegments = stripNumOfLeds / 2;
int halfNumOfSegments = numOfSegments / 2;
int stripMiddle = stripNumOfLeds / 2;
int maxDisplaySegments = stripMiddle - 1;
float sensitivityFactor;
int brightnessValue, prevBrightnessValue;
float ledFactor, ledFactor_div_numOfSegments;
int leftValue = 0, rightValue = 0, maxReadValue = 0;
int leftAnalogValue = 0, rightAnalogValue = 0;
int prevLeftValue = 0, prevRightValue = 0;
int prevLeftAnalogValue = 0, prevRightAnalogValue = 0;
int i, j;
int dropLeft, dropRight;
int leftDropTime, rightDropTime;
int leftPeak = 0, rightPeak = 0;
int leftPeakTime = 0, rightPeakTime = 0;
int leftFirstPeak = true, rightFirstPeak = true;
int readShowPeaksPin, prevReadShowPeaksPin;
uint32_t stripMiddleColor, stripOverflowColor, stripHoldColor;
int leftPeakBouncing = false, rightPeakBouncing = false;
int leftPeakBounce = 0, rightPeakBounce = 0;
int prevLeftPeakBounce = 0, prevRightPeakBounce = 0;
int leftPeakBounceCounter = 0, rightPeakBounceCounter = 0;
int leftPeakBounceDelayCounter = 0, rightPeakBounceDelayCounter = 0;
//
// initialize the strip or rings
//
Adafruit_NeoPixel strip = Adafruit_NeoPixel(stripNumOfLeds, stripPin, NEO_GRB + NEO_KHZ800);
//
// setup
//
void setup() {
#ifdef DEBUG
Serial.begin(9600);
#endif
pinMode(showPeaksPin, INPUT);
strip.begin();
setStripColors();
startupAnimation();
if (useSensorValues)
setInitialDisplayPeaks();
else
setSensitivityFactor();
}
//
// main loop
//
void loop() {
if (useSensorValues)
readSensorValues();
readValues();
drawValues();
if (displayPeaks) {
getPeaks();
drawPeaks();
}
storePrevValues();
}
//
// functions
//
void setInitialDisplayPeaks() {
readShowPeaksPin = digitalRead(showPeaksPin);
if (readShowPeaksPin == HIGH)
displayPeaks = false;
else
displayPeaks = true;
prevReadShowPeaksPin = readShowPeaksPin;
}
void readSensorValues() {
readShowPeaksPin = digitalRead(showPeaksPin);
if (momentarySwitch) {
if (readShowPeaksPin == LOW && prevReadShowPeaksPin == HIGH) {
if (displayPeaks == true) {
displayPeaks = false;
clearLeftPeak();
clearRightPeak();
if (momentarySwitch)
while (digitalRead(showPeaksPin) == LOW) {}
}
else {
displayPeaks = true;
}
}
}
else {
if (readShowPeaksPin == LOW && prevReadShowPeaksPin == HIGH)
displayPeaks = true;
else if (readShowPeaksPin == HIGH && prevReadShowPeaksPin == LOW) {
displayPeaks = false;
clearLeftPeak();
clearRightPeak();
}
}
prevReadShowPeaksPin = readShowPeaksPin;
brightnessValue = analogRead(brightnessPin);
brightnessValue = map(brightnessValue, 0, 1023, 0, 255);
if (abs(brightnessValue - prevBrightnessValue) > sensorDeviationBrightness) {
ledBrightness = brightnessValue;
setStripColors();
prevBrightnessValue = brightnessValue;
}
sensitivityValue = analogRead(sensitivityPin);
sensitivityValue = map(sensitivityValue, 0, 1023, 0, 255);
setSensitivityFactor();
}
void setSensitivityFactor() {
//sensitivityValue_div_numOfSegments = sensitivityValue / numOfSegments;
sensitivityFactor = ((float) sensitivityValue / 255 * (float) maxSensitivity / 255);
}
void readValues() {
leftAnalogValue = analogRead(leftPin);
rightAnalogValue = analogRead(rightPin);
if (swapLeftRight) {
int tempValue = leftAnalogValue;
leftAnalogValue = rightAnalogValue;
rightAnalogValue = tempValue;
}
if (leftAnalogValue < prevLeftAnalogValue) {
leftDropTime++;
if (leftDropTime > dropDelay) {
leftAnalogValue = prevLeftAnalogValue * dropFactor;
leftDropTime = 0;
}
else
leftAnalogValue = prevLeftAnalogValue;
}
if (rightAnalogValue < prevRightAnalogValue) {
rightDropTime++;
if (rightDropTime > dropDelay) {
rightAnalogValue = prevRightAnalogValue * dropFactor;
rightDropTime = 0;
}
else
rightAnalogValue = prevRightAnalogValue;
}
#ifdef DEBUG
Serial.print(leftAnalogValue);
Serial.print(" ");
Serial.println(rightAnalogValue);
#endif
// map values
leftValue = map(leftAnalogValue * sensitivityFactor, minValue, maxValue, 0, maxDisplaySegments);
rightValue = map(rightAnalogValue * sensitivityFactor, minValue, maxValue, 0, maxDisplaySegments);
if (leftValue > maxDisplaySegments) {
leftValue = maxDisplaySegments;
drawOverflow();
}
if (rightValue > maxDisplaySegments) {
rightValue = maxDisplaySegments;
drawOverflow();
}
}
void storePrevValues() {
prevLeftAnalogValue = leftAnalogValue;
prevRightAnalogValue = rightAnalogValue;
prevLeftValue = leftValue;
prevRightValue = rightValue;
}
void getPeaks() {
if (leftValue > leftPeak) {
leftPeak = leftValue;
leftPeakTime = 0;
leftFirstPeak = true;
if (bouncingPeaks) {
leftPeakBouncing = true;
leftPeakBounceCounter = 0;
leftPeakBounceDelayCounter = 0;
}
}
else {
leftPeakTime++;
if (droppingPeak) {
if (leftFirstPeak) {
if (leftPeakTime > peakTimeFirstDropDelay) {
clearLeftPeak();
leftFirstPeak = false;
}
}
else {
if (leftPeakTime > peakTimeDropDelay) {
clearLeftPeak();
}
}
}
else {
if (leftPeakTime > peakTimeNoDropDelay) {
clearLeftPeak();
}
}
}
if (leftPeakBouncing) {
if (leftFirstPeak) {
leftPeakBounceDelayCounter++;
if (leftPeakBounceDelayCounter >= bouncingPeakDelay) {
leftPeakBounceDelayCounter = 0;
leftPeakBounceCounter += bouncingPeakCounterInc;
if (leftPeakBounceCounter >= 180) {
clearLeftBouncePeak();
clearLeftBounce();
}
else {
leftPeakBounce = min((sin(leftPeakBounceCounter * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - leftPeak));
if (leftPeakBounce != prevLeftPeakBounce) {
clearLeftBouncePeak();
}
prevLeftPeakBounce = leftPeakBounce;
}
}
}
}
if (rightValue > rightPeak) {
rightPeak = rightValue;
rightPeakTime = 0;
rightFirstPeak = true;
if (bouncingPeaks) {
rightPeakBouncing = true;
rightPeakBounceCounter = 0;
rightPeakBounceDelayCounter = 0;
}
}
else {
rightPeakTime++;
if (droppingPeak) {
if (rightFirstPeak) {
if (rightPeakTime > peakTimeFirstDropDelay) {
clearRightPeak();
rightFirstPeak = false;
}
}
else {
if (rightPeakTime > peakTimeDropDelay)
clearRightPeak();
}
}
else {
if (rightPeakTime > peakTimeNoDropDelay)
clearRightPeak();
}
}
if (rightPeakBouncing) {
if (rightFirstPeak) {
rightPeakBounceDelayCounter++;
if (rightPeakBounceDelayCounter >= bouncingPeakDelay) {
rightPeakBounceDelayCounter = 0;
rightPeakBounceCounter += bouncingPeakCounterInc;
if (rightPeakBounceCounter >= 180) {
clearRightBouncePeak();
clearRightBounce();
}
else {
rightPeakBounce = min((sin(rightPeakBounceCounter * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - rightPeak));
if (rightPeakBounce != prevRightPeakBounce) {
clearRightBouncePeak();
}
prevRightPeakBounce = rightPeakBounce;
}
}
}
}
}
void drawValues() {
if (splitStrip) {
for (i = middleOffset; i < leftValue; i++)
strip.setPixelColor(i, stripColor[i]);
for (i = prevLeftValue; i > leftValue; i--)
strip.setPixelColor(i, 0);
for (i = middleOffset; i < rightValue; i++)
strip.setPixelColor(stripMiddle + i, stripColor[i]);
for (i = prevRightValue; i > rightValue; i--)
strip.setPixelColor(stripMiddle + i, 0);
}
else {
for (i = middleOffset; i < leftValue; i++)
strip.setPixelColor(stripMiddle + i, stripColor[i]);
for (i = prevLeftValue; i > leftValue; i--)
strip.setPixelColor(stripMiddle + i, 0);
for (i = middleOffset; i < rightValue; i++)
strip.setPixelColor(stripMiddle - i, stripColor[i]);
for (i = prevRightValue; i > rightValue; i--)
strip.setPixelColor(stripMiddle - i, 0);
}
if (displayMiddleLed) strip.setPixelColor(stripMiddle, stripMiddleColor);
strip.show();
}
void drawPeaks() {
if (leftPeak > 0) {
if (droppingPeakFade && leftPeakBouncing == false)
stripHoldColor = strip.Color(max(1, (255 * leftPeak * ledFactor_div_numOfSegments)), 0, 0);
else
stripHoldColor = stripColor[numOfSegments];
if (splitStrip)
strip.setPixelColor((leftPeak + leftPeakBounce), stripHoldColor);
else
strip.setPixelColor(stripMiddle + (leftPeak + leftPeakBounce), stripHoldColor);
}
if (rightPeak > 0) {
if (droppingPeakFade && rightPeakBouncing == false)
stripHoldColor = strip.Color(max(1, (255 * rightPeak * ledFactor_div_numOfSegments)), 0, 0);
else
stripHoldColor = stripColor[numOfSegments];
if (splitStrip)
strip.setPixelColor(stripMiddle + rightPeak + prevRightPeakBounce, stripHoldColor);
else
strip.setPixelColor(stripMiddle - (rightPeak + prevRightPeakBounce), stripHoldColor);
}
if (leftPeak > 0 || rightPeak > 0)
strip.show();
}
void clearLeftPeak() {
if (splitStrip)
strip.setPixelColor((leftPeak + prevLeftPeakBounce), 0);
else
strip.setPixelColor(stripMiddle + (leftPeak + prevLeftPeakBounce), 0);
if (droppingPeak)
leftPeak = leftPeak * peakDropFactor;
else
leftPeak = 0;
leftPeakTime = 0;
}
void clearLeftBounce() {
leftPeakBouncing = false;
leftPeakBounceCounter = 0;
leftPeakBounce = 0;
prevLeftPeakBounce = 0;
}
void clearLeftBouncePeak() {
if (splitStrip)
strip.setPixelColor((leftPeak + prevLeftPeakBounce), 0);
else
strip.setPixelColor(stripMiddle + (leftPeak + prevLeftPeakBounce), 0);
}
void clearRightPeak() {
if (splitStrip)
strip.setPixelColor(stripMiddle + rightPeak + prevRightPeakBounce, 0);
else
strip.setPixelColor(stripMiddle - (rightPeak + prevRightPeakBounce), 0);
if (droppingPeak)
rightPeak = rightPeak * peakDropFactor;
else
rightPeak = 0;
rightPeakTime = 0;
}
void clearRightBounce() {
rightPeakBouncing = false;
rightPeakBounceCounter = 0;
rightPeakBounce = 0;
prevRightPeakBounce = 0;
}
void clearRightBouncePeak() {
if (splitStrip)
strip.setPixelColor((stripMiddle + rightPeak + prevRightPeakBounce), 0);
else
strip.setPixelColor(stripMiddle - (rightPeak + prevRightPeakBounce), 0);
}
void drawOverflow() {
for (i = 0; i <= numOfSegments; i++) {
strip.setPixelColor(stripMiddle + i, stripOverflowColor);
strip.setPixelColor(stripMiddle - i, stripOverflowColor);
}
strip.show();
delay(overflowDelay);
for (i = 0; i <= numOfSegments; i++) {
strip.setPixelColor(stripMiddle + i, 0);
strip.setPixelColor(stripMiddle - i, 0);
}
strip.show();
}
void setStripColors() {
int orangeLimit;
ledFactor = (float)ledBrightness / 255;
float orangeFactor = orangeLimitAmount / halfNumOfSegments;
ledFactor_div_numOfSegments = ledFactor / numOfSegments;
stripOverflowColor = strip.Color(min(255, 255 * ledFactor * 1.5), 0, 0);
stripMiddleColor = strip.Color(0, 0, 255 * ledFactor);
stripColor[0] = strip.Color(0, 255 * ledFactor, 0);
for (i = 1; i <= numOfSegments; i++) {
if (i <= halfNumOfSegments)
orangeLimit = (i * orangeFactor);
else
orangeLimit = ((numOfSegments - i) * orangeFactor);
stripColor[i] = strip.Color((255 * i * ledFactor_div_numOfSegments), ((255 - orangeLimit) * (numOfSegments - i) * ledFactor_div_numOfSegments), 0);
}
stripHoldColor = stripColor[numOfSegments];
}
void startupAnimation() {
for (j = 0; j < 2; j++) {
for (i = 0; i <= numOfSegments; i++) {
strip.setPixelColor(stripMiddle - i, stripColor[i]);
strip.setPixelColor(stripMiddle + i, stripColor[i]);
strip.show();
delay(startupAnimationDelay);
}
for (i = 0; i <= numOfSegments; i++) {
strip.setPixelColor(stripMiddle + i, 0);
strip.setPixelColor(stripMiddle - i, 0);
strip.show();
delay(startupAnimationDelay);
}
}
}
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