151 lines
6.4 KiB
Arduino
151 lines
6.4 KiB
Arduino
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/* soundbracelet
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*
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* By: Jon Burroughs
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*
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* Converted to FastLED by: Andrew Tuline
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*
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* Date: October, 2014
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*
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* soundbracelet was based Neopixel code by Jon Burroughs:
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*
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* https://www.youtube.com/watch?v=JjX8X5D8RW0&feature=youtu.be
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* https://plus.google.com/105445034001275025240/posts/jK2fxRx79kj
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* http://www.slickstreamer.info/2014/07/led-bracelet-vu-meter-3dprinting.html
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*
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* That was based on the Adafruit LED Ampli-tie project at:
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*
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* https://learn.adafruit.com/led-ampli-tie/overview
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*
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* This version was written for a Sparkfun INMP401 MEMS microphone/pre-amp. In this case, it's plugged into A5 of the Arduino.
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*
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* Plug Vcc of the microphone into 3.3V of Arduino. Connect 3.3V of Arduino to the AREF pin, and gnd to gnd.
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*
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*/
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#include "FastLED.h" // FastLED library.
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#if FASTLED_VERSION < 3001000
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#error "Requires FastLED 3.1 or later; check github for latest code."
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#endif
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// Fixed definitions cannot change on the fly.
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#define LED_DT 12 // Data pin to connect to the strip.
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#define LED_CK 11 // Clock pin for WS2801 or APA102.
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#define COLOR_ORDER BGR // It's GRB for WS2812 and BGR for APA102.
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#define LED_TYPE SK6812 // Using APA102, WS2812, WS2801. Don't forget to modify LEDS.addLeds to suit.
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#define NUM_LEDS 60 // Number of LED's.
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// Initialize changeable global variables.
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uint8_t max_bright = 128; // Overall brightness definition. It can be changed on the fly.
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struct CRGB leds[NUM_LEDS]; // Initialize our LED array.
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#define MIC_PIN 5 // Analog port for microphone
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#define DC_OFFSET 0 // DC offset in mic signal - if unusure, leave 0
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// I calculated this value by serialprintln lots of mic values
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#define NOISE 30 // Noise/hum/interference in mic signal and increased value until it went quiet
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#define SAMPLES 60 // Length of buffer for dynamic level adjustment
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#define TOP (NUM_LEDS + 2) // Allow dot to go slightly off scale
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#define PEAK_FALL 10 // Rate of peak falling dot
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byte
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peak = 0, // Used for falling dot
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dotCount = 0, // Frame counter for delaying dot-falling speed
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volCount = 0; // Frame counter for storing past volume data
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int
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vol[SAMPLES], // Collection of prior volume samples
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lvl = 10, // Current "dampened" audio level
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minLvlAvg = 0, // For dynamic adjustment of graph low & high
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maxLvlAvg = 512;
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void setup() {
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// This is only needed on 5V Arduinos (Uno, Leonardo, etc.). Connect 3.3V to mic AND TO AREF ON ARDUINO and enable this
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// line. Audio samples SK6812are 'cleaner' at 3.3V. COMMENT OUT THE FOLLOWING LINE FOR 3.3V ARDUINOS (FLORA, ETC.):
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analogReference(EXTERNAL);
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Serial.begin(57600); // Initialize serial port for debugging.
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delay(1000); // Soft startup to ease the flow of electrons.
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// LEDS.addLeds<LED_TYPE, LED_DT, COLOR_ORDER>(leds, NUM_LEDS); // Use this for WS2812B
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LEDS.addLeds<LED_TYPE, LED_DT, LED_CK, COLOR_ORDER>(leds, NUM_LEDS); // Use this for WS2801 or APA102
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FastLED.setBrightness(max_bright);
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set_max_power_in_volts_and_milliamps(5, 500); // FastLED 2.1 Power management set at 5V, 500mA
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} // setup()
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void loop() {
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soundbracelet();
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FastLED.show(); // Power managed FastLED display
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} // loop()
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void soundbracelet() {
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uint8_t i;
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uint16_t minLvl, maxLvl;
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int n, height;
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n = analogRead(MIC_PIN); // Raw reading from mic
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n = abs(n - 512 - DC_OFFSET); // Center on zero
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Serial.println(n);
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n = (n <= NOISE) ? 0 : (n - NOISE); // Remove noise/hum
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lvl = ((lvl * 7) + n) >> 3; // "Dampened" reading (else looks twitchy)
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// Calculate bar height based on dynamic min/max levels (fixed point):
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height = TOP * (lvl - minLvlAvg) / (long)(maxLvlAvg - minLvlAvg);
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if (height < 0L) height = 0; // Clip output
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else if (height > TOP) height = TOP;
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if (height > peak) peak = height; // Keep 'peak' dot at top
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// Color pixels based on rainbow gradient
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for (i=0; i<NUM_LEDS; i++) {
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if (i >= height) leds[i].setRGB( 0, 0,0);
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else leds[i] = CHSV(map(i,0,NUM_LEDS-1,30,150), 255, 255);
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}
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// Draw peak dot
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if (peak > 0 && peak <= NUM_LEDS-1) leds[peak] = CHSV(map(peak,0,NUM_LEDS-1,30,150), 255, 255);
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// Every few frames, make the peak pixel drop by 1:
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if (++dotCount >= PEAK_FALL) { // fall rate
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if(peak > 0) peak--;
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dotCount = 0;
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}
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vol[volCount] = n; // Save sample for dynamic leveling
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if (++volCount >= SAMPLES) volCount = 0; // Advance/rollover sample counter
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// Get volume range of prior frames
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minLvl = maxLvl = vol[0];
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for (i=1; i<SAMPLES; i++) {
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if (vol[i] < minLvl) minLvl = vol[i];
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else if (vol[i] > maxLvl) maxLvl = vol[i];
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}
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// minLvl and maxLvl indicate the volume range over prior frames, used
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// for vertically scaling the output graph (so it looks interesting
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// regardless of volume level). If they're too close together though
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// (e.g. at very low volume levels) the graph becomes super coarse
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// and 'jumpy'...so keep some minimum distance between them (this
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// also lets the graph go to zero when no sound is playing):
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if((maxLvl - minLvl) < TOP) maxLvl = minLvl + TOP;
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minLvlAvg = (minLvlAvg * 63 + minLvl) >> 6; // Dampen min/max levels
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maxLvlAvg = (maxLvlAvg * 63 + maxLvl) >> 6; // (fake rolling average)
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} // fastbracelet()
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