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Thread: Doorbell with Audio and LED strip

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  1. #1
    Junior Member
    Join Date
    Oct 2015
    Location
    Oregon
    Posts
    2

    Doorbell with Audio and LED strip

    I'm working up a 6-button doorbell for a shared office. The goal is to play a song snipped (WAV file) and animate a string of 77 LEDs for the duration of the song. Each playback/animation is triggered by a pushbutton. The following code works for shorter LED strips (10 are fine, but 20 aren't). With more LEDs, it latches during playback. The "latch" behavior is that it stops playing mid-file and emits a buzz via the audio out and the LED strip stops animating. I suspected an interrupt issue and switched from FastLED to the WS2812serial library which I read is non-blocking. However, the issue exists using either library. I suspect there is something problematic with my logic for testing buttons etc?

    If anyone has suggestions, I'm happy to hear them! Thanks,

    Code:
    // Teensy 3.2 with Audio Shield implemented as 6-button doorbell
    
    #include <Audio.h>
    #include <SD.h>
    #include <Bounce.h>
    #include <WS2812Serial.h>
    
    // How many leds are in the strip?
    //const int numled = 77;
    const int numled = 10;
    
    // Data pin that led data will be written out over
    const int pin = 1; 
    
    byte drawingMemory[numled*3];         //  3 bytes per LED
    DMAMEM byte displayMemory[numled*12]; // 12 bytes per LED
    
    WS2812Serial leds(numled, displayMemory, drawingMemory, pin, WS2812_GRB);
    
    #define RED    0xFF0000
    #define GREEN  0x00FF00
    #define BLUE   0x0000FF
    #define YELLOW 0xFFFF00
    #define PINK   0xFF1088
    #define ORANGE 0xE05800
    #define WHITE  0xFFFFFF
    #define BLACK  0x000000
    
    long randNumber;
    const int buttonPin1 = 2;
    Bounce pushbutton1 = Bounce(buttonPin1, 20);
    const int buttonPin2 = 3;
    Bounce pushbutton2 = Bounce(buttonPin2, 20);
    const int buttonPin3 = 4;
    Bounce pushbutton3 = Bounce(buttonPin3, 20);
    const int buttonPin4 = 5;
    Bounce pushbutton4 = Bounce(buttonPin4, 20);
    const int buttonPin5 = 16;
    Bounce pushbutton5 = Bounce(buttonPin5, 20);
    const int buttonPin6 = 17;
    Bounce pushbutton6 = Bounce(buttonPin6, 20);
    
    AudioPlaySdWav           playSdWav1;
    AudioOutputI2S           i2s1;
    AudioConnection          patchCord1(playSdWav1, 0, i2s1, 0);
    AudioConnection          patchCord2(playSdWav1, 1, i2s1, 1);
    AudioControlSGTL5000     sgtl5000_1;
    
    
    void setup() {
      delay(2000);
      leds.begin();
      // initialize the pushbutton pin as an input:
      pinMode(buttonPin1, INPUT_PULLUP);
      pinMode(buttonPin2, INPUT_PULLUP);
      pinMode(buttonPin3, INPUT_PULLUP);
      pinMode(buttonPin4, INPUT_PULLUP);
      pinMode(buttonPin5, INPUT_PULLUP);
      pinMode(buttonPin6, INPUT_PULLUP);
      
      AudioMemory(8);
      sgtl5000_1.enable();
      sgtl5000_1.volume(0.5);
      SPI.setMOSI(7);
      SPI.setSCK(14);
      if (!(SD.begin(10))) {
        while (1) {
          leds.setPixel(1, RED);
          leds.setPixel(2, RED); // indicates SD card error
          leds.show();
          delay(500);
        }
      }
    }
    
    
    void loop() {
      int microsec = 1500000 / leds.numPixels();
      
      pushbutton1.update();
      if (pushbutton1.fallingEdge()) {
        playSdWav1.play("925.wav");
        colorWipe(WHITE, microsec);
      }
      pushbutton2.update();
      if (pushbutton2.fallingEdge()) {
        playSdWav1.play("gtw.wav");
        colorWipe(BLUE, microsec);
      }
      pushbutton3.update();
      if (pushbutton3.fallingEdge()) {
        playSdWav1.play("ilikeit.wav");
        colorWipe(RED, microsec);
      }
      pushbutton4.update();
      if (pushbutton4.fallingEdge()) {
        playSdWav1.play("oops.wav");
        colorWipe(YELLOW, microsec);
      }
      pushbutton5.update();
      if (pushbutton5.fallingEdge()) {
        playSdWav1.play("queens.wav");
        colorWipe(PINK, microsec);
      }
      pushbutton6.update();
      if (pushbutton6.fallingEdge()) {
        playSdWav1.play("tiktok.wav");
        colorWipe(GREEN, microsec);
      }
      if ( playSdWav1.isPlaying() == 0 ) {
        delay(200);
        if (playSdWav1.isPlaying() == 0 ) {
          colorWipe(BLACK, 20);
        }
      }
    }
    
    void colorWipe(int color, int wait) {
      for (int i=0; i < leds.numPixels(); i++) {
        leds.setPixel(i, color);
      }
      leds.show();
      delay(200);
      delayMicroseconds(wait);
    }

  2. #2
    Junior Member
    Join Date
    Oct 2015
    Location
    Oregon
    Posts
    2
    To follow up, this appears to be a power issue. I was neglecting the draw of bright LEDs and must have been browning-out the teensy. Using dimmer strips or higher current to the LEDs does the trick. Feeling silly, but at least it got me to finally post to the forum!

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