Beats BPM Fastled – tetproject

https://plus.google.com/112916219338292742137/posts/boFjiQNiMAz

FastLED v3.0: One more thing…

Beat generators that generate sine waves (and sawtooth waves) at a BPM you specify. Try this:

#define BPM 60
#define DIMMEST 128
#define BRIGHTEST 255

void loop()
{
// Put something visible on the LEDs
static uint16_t hue16 = 0;
hue16 += 9;
fill_rainbow( leds, NUM_LEDS, hue16 / 256, 3);

// set the brightness to a sine wave that moves with a beat
uint8_t bright = beatsin8( BPM, DIMMEST, BRIGHTEST);
FastLED.setBrightness( bright );

FastLED.show();
}

Docs are coming, but check lib8tion.h for beat8, beat16, beatsin8, and beatsin16. Enjoy!

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Jon Burroughs+1

Ooooo, this is so much fun, I get such a greater range of randomized hue’s this way:
byte BEAT_3 = beatsin8( 6, 0, 255);
byte BEAT_4 = beatsin8( 2, 0, 255);
average = (BEAT_3 + BEAT_4) / 2;And do start getting more of the possible range of colors, I vary the saturation and brightness of the CHSV assignment:

brightness= beatsin8( 3, 185, 255);
saturation= beatsin8( 6, 200, 255);

leds[i] = CHSV(average , saturation, brightness);

Oct 30, 2014
turgan s

I’m sort of a beginner trying to use Fastled 3.1

1) I connected a pot to vary the bpm of a fade in / out effect. The pot helps me beat-match to any music manually. However as with standard dj’ing cases I also need a button to reset the timer. Think of it as the play button of cd-dj’s. It will re-start my sine beat at the exact top. The bpm wont change though.

I read your #define USE_GET_MILLISECOND_TIMER 1 however still not clear. Cannot get my head to wrap around the details and uses of the timing. Do you have any sources I can read on this? or do you have a code example?

So far I have:
////
#define USE_GET_MILLISECOND_TIMER 1
uint32_t resetTime;
const int buttonPin = 7;
void setup() {
pinMode(buttonPin, INPUT);
uint32_t get_millisecond_timer()
{
return millis();
}
void loop(){
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {
resetTime = millis() ;
}
////

2) I’m still researching this one but the leds flicker as I change the pot. Is there a way to prevent this flickering, I tried using a capacitor but didnt seem to help.

Aug 10, 2015
Mark Kriegsman

Change your
get_millisecond_timer to return millis() – resetTime and try that!

Aug 10, 2015
turgan s

that halted the entire strip at max brightness interestingly. Here is my entire code: http://pastie.org/10342234

Aug 10, 2015
Mark Kriegsman

You sure that HIGH means Pressed, the way you have it wired? Does the strip run if you hold the button?

Aug 10, 2015

turgan s+1

Ok now it worked! With a linear pot and a (play) button its basically a dj / vj controller now. Thanks! My final code is here:

//TGAN SIFIRLAMA DUGMESI
#define USE_GET_MILLISECOND_TIMER 1
//TGAN SIFIRLAMA DUGMESI


#include "FastLED.h"                                          // FastLED library. Please use the latest development version.

#if FASTLED_VERSION < 3001000
#error "Requires FastLED 3.1 or later; check github for latest code."
#endif

 
// Fixed definitions cannot change on the fly.
#define LED_DT 2                                             // Data pin to connect to the strip.
//#define LED_CK 11                                             // Clock pin for WS2801 or APA102.
#define COLOR_ORDER GRB                                       // It's GRB for WS2812 and GBR for APA102.
#define LED_TYPE WS2812B                                       // Using APA102, WS2812, WS2801. Don't forget to change LEDS.addLeds.
#define NUM_LEDS 300                                           // Number of LED's.

// Global variables can be changed on the fly.
uint8_t max_bright = 128;                                      // Overall brightness definition. It can be changed on the fly.

// TGAN Potentiometer VALUE
int potPin = A0;
int potValue = 0; 
int PotMappedOutputValue = 30;
// TGAN Potentiometer 

//TGAN SIFIRLAMA DUGMESI
const int buttonPin = 50;
int buttonState = 0; 
//TGAN SIFIRLAMA DUGMESI


struct CRGB leds[NUM_LEDS];                                   // Initialize our LED array.

// Colours defined for below
long firstval = 0xff00ff;
CRGB rgbval(50,0,500);
CHSV hsvval(150,255,200);
uint8_t startpos = 0;

//TGAN SIFIRLAMA DUGMESI
uint32_t resetTime;
//TGAN SIFIRLAMA DUGMESI

int endpos = NUM_LEDS-1;

uint8_t thishue = 0;
uint8_t deltahue = 15;

void setup() {
//TGAN SIFIRLAMA DUGMESI
pinMode(buttonPin, INPUT); 
//TGAN SIFIRLAMA DUGMESI


  delay(1000);                                                // Power-up safety delay.
  Serial.begin(57600);                                        // Initialize serial port for debugging.

  LEDS.addLeds<LED_TYPE, LED_DT, COLOR_ORDER>(leds, NUM_LEDS);  // Use this for WS2812
  
  FastLED.setBrightness(max_bright);
  set_max_power_in_volts_and_milliamps(5, 500);               // FastLED Power management set at 5V, 500mA.
} // setup()


////BPM CODE ////
//#define BPM       125
// TGAN Potentiometer 
//#define BPM       outputValue
// TGAN Potentiometer 

#define DIMMEST   2
#define BRIGHTEST 255
///// BPM CODE END ////

uint32_t get_millisecond_timer()
{
return millis()-resetTime  ;
}
//TGAN SIFIRLAMA DUGMESI

void loop () {        // Several different ways to fill the strand with a solid colour.
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) { 
resetTime = millis() ;
} ;

potValue = analogRead(potPin); 
PotMappedOutputValue = map(potValue, 0, 1023, 40, 145);

Serial.println(potValue);

////BPM CODE ////
// Put something visible on the LEDs
  static uint16_t hue16 = 0;
  hue16 += 9;
  fill_rainbow( leds, NUM_LEDS, hue16 / 256, 3);

  // set the brightness to a sine wave that moves with a beat
 uint8_t bright = beatsin8(PotMappedOutputValue, DIMMEST, BRIGHTEST);
  FastLED.setBrightness( bright );
  FastLED.show();
///// BPM CODE END ////

  show_at_max_brightness_for_power();                         // Power managed display

} // loop()

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