Mengakses Lampu Flash di ESP32-CAM

int LED_FLASHLIGHT = 4;
void setup() {
  pinMode(LED_FLASHLIGHT, OUTPUT);
}

void loop() {
  digitalWrite(LED_FLASHLIGHT, HIGH);  
  delay(1000);                       
  digitalWrite(LED_FLASHLIGHT, LOW);   
  delay(1000);                       
}

#include <Arduino.h>
#include <WiFi.h>
#include "soc/soc.h"
#include "soc/rtc_cntl_reg.h"
#include "esp_camera.h"

#define FlashLed 4
const char* ssid = "Android_AP";       //wifi hostpot
const char* password = "Rahasiadong";  //password wifi

String serverName = "192.168.1.4";     //alamat server  
String serverPath = "/esp32cam_gallery/upload_img.php";     
const int serverPort = 80;

WiFiClient client;

// CAMERA_MODEL_AI_THINKER
#define PWDN_GPIO_NUM     32
#define RESET_GPIO_NUM    -1
#define XCLK_GPIO_NUM      0
#define SIOD_GPIO_NUM     26
#define SIOC_GPIO_NUM     27

#define Y9_GPIO_NUM       35
#define Y8_GPIO_NUM       34
#define Y7_GPIO_NUM       39
#define Y6_GPIO_NUM       36
#define Y5_GPIO_NUM       21
#define Y4_GPIO_NUM       19
#define Y3_GPIO_NUM       18
#define Y2_GPIO_NUM        5
#define VSYNC_GPIO_NUM    25
#define HREF_GPIO_NUM     23
#define PCLK_GPIO_NUM     22

const int Interval = 30000;    // proses pengambilan photo interval 30 detik
unsigned long previousMillis = 0; 
String jsonres;

void setup() {
  WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); 
  Serial.begin(115200);
  pinMode(FlashLed, OUTPUT); digitalWrite(FlashLed, LOW); 
  WiFi.mode(WIFI_STA);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);  
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("ESP32-CAM IP Address: ");
  Serial.println(WiFi.localIP());

  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_sscb_sda = SIOD_GPIO_NUM;
  config.pin_sscb_scl = SIOC_GPIO_NUM;
  config.pin_pwdn = PWDN_GPIO_NUM;
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;

  // init with high specs to pre-allocate larger buffers
  if(psramFound()){
    config.frame_size = FRAMESIZE_VGA;
    config.jpeg_quality = 12;  //0-63 lower number means higher quality
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 8;  //0-63 lower number means higher quality
    config.fb_count = 1;
  }
  
  // camera init
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    delay(1000);
    ESP.restart();
  }

  sensor_t * s = esp_camera_sensor_get();
  s->set_framesize(s, FRAMESIZE_SVGA); //UXGA|SXGA|XGA|SVGA|VGA|CIF|QVGA|HQVGA|QQVGA
}

void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= Interval) {
    Serial.println("Bersiap kirim foto ke server..");
    sendPhoto();
    previousMillis = currentMillis;
  }
}

void sendPhoto() {
  String AllData;
  String DataBody;
  digitalWrite(FlashLed, HIGH);  //aktifkan flash light
  //pre capture for accurate timing
  for (int i = 0; i <= 3; i++) {
    camera_fb_t * fb = NULL;
    fb = esp_camera_fb_get();
     if(!fb) {
        Serial.println("Camera capture failed");
        delay(1000);
        ESP.restart();
        return;
      } 
    esp_camera_fb_return(fb);
    delay(200);
  }
  
  camera_fb_t * fb = NULL;
  fb = esp_camera_fb_get();
  
  digitalWrite(FlashLed, LOW); //nonaktifkan flash light
  
  Serial.println("Connecting to server: " + serverName);

  if (client.connect(serverName.c_str(), serverPort)) {
    Serial.println("Connection successful!");   
     
    String post_data = "--dataMarker\r\nContent-Disposition: form-data; name=\"imageFile\"; filename=\"_esp32Photo.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n";
    String head =  post_data;
    String boundary = "\r\n--dataMarker--\r\n";
    //Serial.println(head);
    uint32_t imageLen = fb->len;
    uint32_t dataLen = head.length() + boundary.length();
    uint32_t totalLen = imageLen + dataLen;
    
    client.println("POST " + serverPath + " HTTP/1.1");
    client.println("Host: " + serverName);
    client.println("Content-Length: " + String(totalLen));
    client.println("Content-Type: multipart/form-data; boundary=dataMarker");
    client.println();
    client.print(head);
  
    uint8_t *fbBuf = fb->buf;
    size_t fbLen = fb->len;
    //Serial.println(fbLen);
    for (size_t n=0; n<fbLen; n=n+1024) {
      if (n+1024 < fbLen) {
        client.write(fbBuf, 1024);
        fbBuf += 1024;
      }
      else if (fbLen%1024>0) {
        size_t remainder = fbLen%1024;
        client.write(fbBuf, remainder);
      }
    }   
    client.print(boundary);
    
    esp_camera_fb_return(fb);
   
    int timoutTimer = 10000;
    long startTimer = millis();
    boolean state = false;
    Serial.println("Response:");
    while ((startTimer + timoutTimer) > millis()) {
      Serial.print(".");
      delay(200);
         
      // Skip HTTP headers   
      while (client.available()) {
        char c = client.read();
        if (c == '\n') {
          if (AllData.length()==0) { state=true; }
          AllData = "";
        }
        else if (c != '\r') { AllData += String(c); }
        if (state==true) { DataBody += String(c); }
        startTimer = millis();
      }
      if (DataBody.length()>0) { break; }
    }
    client.stop();
    Serial.println(DataBody);
    Serial.println("##############");
    Serial.println();
    
  }
  else {
    DataBody = "Connection to " + serverName +  " failed.";
    Serial.println(DataBody);
  }
}