ESP32 Cam Reconnect WiFi

Other Hardware 3rd Party Boards
1

Hello all,
I use the sketch below for my ESP32 Cam as a WebServer and it works fine, The problem I have is if there is a power cut then the power comes back on but the ESP32 Cam will not reconnect to the WiFi unless I press the Reboot button, If I am away from home I can't do this, can this sketch be modified to run a loop to check the WiFi connection and reconnect please..

#include <WiFiManager.h>
#include "esp_camera.h"
#include <WiFi.h>
#include <ESPmDNS.h>

//
// WARNING!!! PSRAM IC required for UXGA resolution and high JPEG quality
//            Ensure ESP32 Wrover Module or other board with PSRAM is selected
//            Partial images will be transmitted if image exceeds buffer size
//
//            You must select partition scheme from the board menu that has at least 3MB APP space.
//            Face Recognition is DISABLED for ESP32 and ESP32-S2, because it takes up from 15 
//            seconds to process single frame. Face Detection is ENABLED if PSRAM is enabled as well

// ===================
// Select camera model
// ===================
//#define CAMERA_MODEL_WROVER_KIT // Has PSRAM
//#define CAMERA_MODEL_ESP_EYE // Has PSRAM
//#define CAMERA_MODEL_ESP32S3_EYE // Has PSRAM
//#define CAMERA_MODEL_M5STACK_PSRAM // Has PSRAM
//#define CAMERA_MODEL_M5STACK_V2_PSRAM // M5Camera version B Has PSRAM
//#define CAMERA_MODEL_M5STACK_WIDE // Has PSRAM
//#define CAMERA_MODEL_M5STACK_ESP32CAM // No PSRAM
//#define CAMERA_MODEL_M5STACK_UNITCAM // No PSRAM
#define CAMERA_MODEL_AI_THINKER // Has PSRAM
//#define CAMERA_MODEL_TTGO_T_JOURNAL // No PSRAM
// ** Espressif Internal Boards **
//#define CAMERA_MODEL_ESP32_CAM_BOARD
//#define CAMERA_MODEL_ESP32S2_CAM_BOARD
//#define CAMERA_MODEL_ESP32S3_CAM_LCD

#include "camera_pins.h"

// ===========================
// Enter your WiFi credentials
// ===========================

const char* ssid = "**********";
const char* password = "**********";

void startCameraServer();
void setupLedFlash(int pin);

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  Serial.println();

  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.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

 // WiFi.begin(ssid, password);

 WiFiManager wm;

 
bool res;
 
res = wm.autoConnect("AutoConnectAP","password"); // password protected ap
 
 
 
 
    if(!res) {
 
        Serial.println("Failed to connect");
 
        // ESP.restart();
 
    }

  WiFi.setSleep(false);

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

  
if(!MDNS.begin("esp32cam")) {
Serial.println("Error starting mDNS");
return;
}

  startCameraServer();

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

void loop() {
  // Do nothing. Everything is done in another task by the web server
  delay(10000);
}
1 Like
2

Is this a power cut that affects only the WiFi - not your ESP32 Cam?

Your sketch only attempts to connect in setup(), which only runs once on startup - so, if the WiFi drops out for any reason, it's never going to reconnect without a reboot.

So you need to check in loop(), or your "other task", that the WiFi is still connected - and, if not, try to reconnect.

Alternatively, if the library can notify you when it disconnects, then "catch" that notification, and trigger your reconnect scheme from there ...

3

The power cut takes out all the power so WiFi and Esp32 Cam, the problem is If I am not in the country then I can’t Reboot it, I was hopping if this sketch could be modified to have a statement in a loop that checks to ensure the ESP is connected to the WiFi and if not it then reconnects.

4

Isn't that what this does:

5

a statement in a loop that checks to ensure the ESP is connected to the WiFi and if not it then reconnects.

It may check if connected but I have asked the above

6

So you put that check in a loop; eg,

loop()
{
   if( WiFi.status() != WL_CONNECTED )
   {
      // WiFi is not connected - reconnect!
   }
   :
   :

}
7

Ok I see, where in my code would I put this loop please, I am very new to this

8

You already have a loop() in your code - it's a standard part of an Arduino sketch:

9

So would it be like this please

startCameraServer();

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

void loop() 
 {
   if( WiFi.status() != WL_CONNECTED )
   {
      // WiFi is not connected - reconnect!
   }
   :
   :
  delay(10000);
}
10

Yes.

I would suggest that you take your connect-to-WiFi code out of setup(), and make it into a function.
Then you call that function both from setup() - for the initial connection - and from loop() when you need to do a re-connect.

Having duplicated code is always a Bad Thing...

11

sorry but I don't have a clue on how to do that but thank you for your help

12

This appears to be your connect-to-WiFi code:

So make it a function:

void connect_to_wifi( void )
{
   res = wm.autoConnect("AutoConnectAP","password"); // password protected ap 
 
   if(!res) {
         Serial.println("Failed to connect");
         // ESP.restart();
   }

     WiFi.setSleep(false);

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

   Serial.println("");
   Serial.println("WiFi connected");
}

Call it at the end of setup() (where it was already), and when you detect WiFi lost in loop()

   :
   :
   connect_to_wifi();
} // end of setup()

loop()
{
   if( WiFi.status() != WL_CONNECTED )
   {
      // WiFi is not connected - reconnect!
      connect_to_wifi();
   }
   :
   :

}

Disclaimer: I just typed it straight into the forum - untested!!

13

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