ESP32-CAM MAX98357A Audio Player

Using Arduino Programming Questions
1 
#include "esp_camera.h"
#include <WiFi.h>
#include "SD_MMC.h"
#include <Audio.h>
#include <AudioFileSourceSD.h>
#include <AudioGeneratorWAV.h>
#include <AudioOutputI2S.h>

#define CAMERA_MODEL_AI_THINKER // Has PSRAM

#define SD_CS_PIN 5  // SD card CS (Chip Select) pin
#define MAX98357A_GAIN 2  // MAX98357As GAIN (ses gücü) pin
#define I2S_BCLK 14  // I2S BCLK pin
#define I2S_LRC 4    // I2S LRC pin
#define I2S_DOUT 15  //  I2S DOUT pin
#include "camera_pins.h"

// ===========================
// Enter your WiFi credentials
// ===========================
const char* ssid = "******";
const char* password = "******";

AudioFileSourceSD *file;
AudioGeneratorWAV *wav;
AudioOutputI2S *out;


void startCameraServer();
void capturePhoto();
void playWavFile(const char* filePath);
void setupLedFlash(int pin);

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  Serial.println();
    
   if(!SD_MMC.begin("/sdcard", true)) {
    Serial.println("SD card failed to initialize");
    return;
  }
  pinMode(13, INPUT_PULLUP);

  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = Y2_GPIO_NUM;
  config.pin_d1 = Y3_GPIO_NUM;
  config.pin_d2 = Y4_GPIO_NUM;
  config.pin_d3 = Y5_GPIO_NUM;
  config.pin_d4 = Y6_GPIO_NUM;
  config.pin_d5 = Y7_GPIO_NUM;
  config.pin_d6 = Y8_GPIO_NUM;
  config.pin_d7 = Y9_GPIO_NUM;
  config.pin_xclk = XCLK_GPIO_NUM;
  config.pin_pclk = PCLK_GPIO_NUM;
  config.pin_vsync = VSYNC_GPIO_NUM;
  config.pin_href = HREF_GPIO_NUM;
  config.pin_sccb_sda = SIOD_GPIO_NUM;
  config.pin_sccb_scl = SIOC_GPIO_NUM;
  config.pin_pwdn = PWDN_GPIO_NUM;
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.frame_size = FRAMESIZE_UXGA;
  config.pixel_format = PIXFORMAT_JPEG; // for streaming
  //config.pixel_format = PIXFORMAT_RGB565; // for face detection/recognition
  config.grab_mode = CAMERA_GRAB_WHEN_EMPTY;
  config.fb_location = CAMERA_FB_IN_PSRAM;
  config.jpeg_quality = 12;
  config.fb_count = 1;
  
  // if PSRAM IC present, init with UXGA resolution and higher JPEG quality
  //                      for larger pre-allocated frame buffer.
  if(config.pixel_format == PIXFORMAT_JPEG){
    if(psramFound()){
      config.jpeg_quality = 10;
      config.fb_count = 2;
      config.grab_mode = CAMERA_GRAB_LATEST;
    } else {
      // Limit the frame size when PSRAM is not available
      config.frame_size = FRAMESIZE_SVGA;
      config.fb_location = CAMERA_FB_IN_DRAM;
    }
  } else {
    // Best option for face detection/recognition
    config.frame_size = FRAMESIZE_240X240;
#if CONFIG_IDF_TARGET_ESP32S3
    config.fb_count = 2;
#endif
  }

#if defined(CAMERA_MODEL_ESP_EYE)
  pinMode(13, INPUT_PULLUP);
  pinMode(14, INPUT_PULLUP);
#endif

  // camera init
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }

  sensor_t * s = esp_camera_sensor_get();
  // initial sensors are flipped vertically and colors are a bit saturated
  if (s->id.PID == OV3660_PID) {
    s->set_vflip(s, 1); // flip it back
    s->set_brightness(s, 1); // up the brightness just a bit
    s->set_saturation(s, -2); // lower the saturation
  }
  // drop down frame size for higher initial frame rate
  if(config.pixel_format == PIXFORMAT_JPEG){
    s->set_framesize(s, FRAMESIZE_QVGA);
  }

#if defined(CAMERA_MODEL_M5STACK_WIDE) || defined(CAMERA_MODEL_M5STACK_ESP32CAM)
  s->set_vflip(s, 1);
  s->set_hmirror(s, 1);
#endif

#if defined(CAMERA_MODEL_ESP32S3_EYE)
  s->set_vflip(s, 1);
#endif

// Setup LED FLash if LED pin is defined in camera_pins.h
#if defined(LED_GPIO_NUM)
  setupLedFlash(LED_GPIO_NUM);
#endif

  out = new AudioOutputI2S();
  out->SetPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
  out->SetGain(MAX98357A_GAIN);
  out->begin();

  WiFi.begin(ssid, password);
  WiFi.setSleep(false);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  startCameraServer();

  Serial.print("Camera Ready! Use 'http://");
  Serial.print(WiFi.localIP());
  Serial.println("' to connect");
}


void loop() {

  capturePhoto();
  playWavFile("/sdcard/0001.wav");
  // Do nothing. Everything is done in another task by the web server
  delay(10000);
}

void capturePhoto() {
  
  String filePath = "/image" + String(millis()) + ".jpg";

  Serial.println("Taking a photo...");
  camera_fb_t * fb = esp_camera_fb_get();

  if (!fb) {
    Serial.println("Failed to take a photo");
    return;
  }

  File file = SD_MMC.open(filePath, FILE_WRITE);
  if (!file) {
    Serial.println("File Failed to open.");
  } else {
 
    file.write(fb->buf, fb->len);
    Serial.println("File written: " + filePath);
    
    file.close();
  }

  
  esp_camera_fb_return(fb);
}


void playWavFile(const char* filePath) {
  Serial.println("Playing WAV file...");

  file = new AudioFileSourceSD(filePath);
  wav = new AudioGeneratorWAV();
  wav->begin(file, out);
  
  while (wav->isRunning()) {
    if (!wav->loop()) {
      wav->stop();
    }
  }

  delete file;
  delete wav;

  Serial.println("Playback complete");
}

I want to use the ESP32-CAM module to play a wav sound file from the sd card. I am using an I2S sound module (MAX98357A) for this. When I try to load the code I wrote above into the esp32 module using Arduino, I get the error "Compile error for AI Thinker ESP32-CAM card." How can I solve this?

2

This is a forum for the Nano ESP32.

3

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