ESP32 Forum

Posted: **Tue Aug 20, 2019 12:51 pm**

Hello all,

I am looking for a solution for the following:
- use a ESP CAM board to take pictures and store them in a SD card
- archive the images in a single file (daily/weekly/monthly)
- Serve a webpage with download links to the archives.
The taking pictures and serving wepbages part is simple enough, there are many samples avalable.
But i cannot find anything for archiving. And my coding skills are not that advanced to start from scratch.
The ideal solution would be having montly packages of about 100MB worth of images.

Can anyone give me some pointers on this? is this possible or practical on the ESP32?

Thank you

Posted: **Tue Aug 20, 2019 2:35 pm**

I use microtar ( https://github.com/rxi/microtar ) for something similar. Seems to work pretty well.

Jason

Posted: **Tue Aug 20, 2019 5:10 pm**

Hi Jason,

Thank you very much for the quick reply. I would just like to bother you a few minutes more.

I am trying to use it with Arduino and the code compiles file:

Code: [Select all] [Expand/Collapse]

  camera_fb_t * fb = NULL;
  
  // Take Picture with Camera
  fb = esp_camera_fb_get();  
 
mtar_t tar;
 
mtar_open(&tar, "test.tar", "w");
 
mtar_write_file_header(&tar, "test.jpg", fb->len);
mtar_write_data(&tar, fb->buf, fb->len);
 
mtar_finalize(&tar);
 
mtar_close(&tar);

GeSHi © Codebox Plus Extension

but i don't know how to write the archive to the sd card
from the ESP32 CAM sd card example i have:

Code: [Select all] [Expand/Collapse]

  File file = fs.open(path.c_str(), FILE_WRITE);
  if(!file){
    Serial.println("Failed to open file in writing mode");
  } 
  else {
    file.write(fb->buf, fb->len); // payload (image), payload length
    Serial.printf("Saved file to path: %s\n", path.c_str());
  }
  file.close();

that saves the img to the sd card, how can i adapt this to save the tar file instead.

Also does this library rewrite the tar file every time we add a new file?

Thank you

ESP32 Forum

Tar File Creation

Tar File Creation

Re: Tar File Creation

Re: Tar File Creation