(ESP32学习16)ESP32_CAM获取图片并且保存文件名为当前时间

上两篇博文分别ESP32_CAM获取图片以及ESP32_CAM上面那个SD卡的使用方法，而这一篇教大家获取图片之后以当前时间为文件名保存到我们的SD卡里面，然后大家就可以用读卡器看到里面的图片了（ESP32_CAM好像对SD卡大小有要求，不能太大）

OK，直接上代码，已经跑过了的，大家自己看看吧

#include "esp_camera.h"
#include "FS.h"
#include 
#include 
#include "SD_MMC.h"
#include  
#include 
#include "string.h"

//  https://blog.csdn.net/LinQiPing233/article/details/83615058  --  这个是时区的详情
const char* ntpServer = "cn.pool.ntp.org";  //pool.ntp.org为获取时间得接口，可以尝试更多得接口。比如微软的time.windows.com，美国国家标准与技术研究院的time.nist.gov
const long  gmtOffset_sec = 8*60*60;//这里采用UTC计时，中国为东八区，就是 8*60*60
const int   daylightOffset_sec = 0*60*60;
struct tm timeinfo;  //创建一个结构体用于存储时间
char * path = "/2020_6_18_TIME_19_0_47.jpg";
char timr_str[40] = "test.jpg";
//以下是WIFI的链接用户名和密码
#define ssid "b123"
#define password "cx123456" 

//***********************************************************************************************************************    wifi连接
String translateEncryptionType(wifi_auth_mode_t encryptionType) {   //获取wifi的特性
  switch (encryptionType){
    case (WIFI_AUTH_OPEN):
      return "Open";
    case (WIFI_AUTH_WEP):
      return "WEP";
    case (WIFI_AUTH_WPA_PSK):
      return "WPA_PSK";
    case (WIFI_AUTH_WPA2_PSK):
      return "WPA2_PSK";
    case (WIFI_AUTH_WPA_WPA2_PSK):
      return "WPA_WPA2_PSK";
    case (WIFI_AUTH_WPA2_ENTERPRISE):
      return "WPA2_ENTERPRISE";
  }
}  

void scanNetworks(){    //搜索附近的WIFI源并打印出来
  int numberOfNetworks= WiFi.scanNetworks();
  Serial.print("Numberof networks found: ");
  Serial.println(numberOfNetworks);
  for (int i = 0; i< numberOfNetworks; i++) {
    Serial.print("Networkname: ");
    Serial.println(WiFi.SSID(i));
    Serial.print("Signalstrength: ");
    Serial.println(WiFi.RSSI(i));
    Serial.print("MACaddress: ");
    Serial.println(WiFi.BSSIDstr(i));
    Serial.print("Encryptiontype: ");
    String encryptionTypeDescription = translateEncryptionType(WiFi.encryptionType(i));
    Serial.println(encryptionTypeDescription);
    Serial.println("-----------------------");
    }
  }
  
void connectToNetwork(){
  WiFi.begin(ssid,password);
  while (WiFi.status()!= WL_CONNECTED) {
    delay(1000);
    Serial.println("try to connecting ...");
  }
  Serial.println("Connectedto network");
}
  
void wifi_connect(){
  scanNetworks();    //搜索附近的wifi信号并且打印出来
  connectToNetwork();    //链接到wifi
  Serial.println(WiFi.macAddress());    //打印出mac地址
  Serial.println(WiFi.localIP());    //打印出本地ip地址
  Serial.println("wifi连接成功");    //打印出本地ip地址
  //WiFi.disconnect(true);    //断开wifi
  //Serial.println(WiFi.localIP());    
  }
//**************************************************************************************************************************************  摄像头初始化参数
static camera_config_t camera_config = {
    .pin_pwdn = 32,
    .pin_reset = -1,
    .pin_xclk = 0,
    .pin_sscb_sda = 26,
    .pin_sscb_scl = 27,
    
    .pin_d7 = 35,
    .pin_d6 = 34,
    .pin_d5 = 39,
    .pin_d4 = 36,
    .pin_d3 = 21,
    .pin_d2 = 19,
    .pin_d1 = 18,
    .pin_d0 = 5,
    .pin_vsync = 25,
    .pin_href = 23,
    .pin_pclk = 22,
    
    .xclk_freq_hz = 20000000,
    .ledc_timer = LEDC_TIMER_0,
    .ledc_channel = LEDC_CHANNEL_0,
    
    .pixel_format = PIXFORMAT_JPEG,
    .frame_size = FRAMESIZE_XGA,
    .jpeg_quality = 12,
    .fb_count = 1,
};

esp_err_t camera_init() {
    //initialize the camera
    esp_err_t err = esp_camera_init(&camera_config);
    if (err != ESP_OK) {
        Serial.print("Camera Init Failed");
        return err;
    }
    sensor_t * s = esp_camera_sensor_get();
    //initial sensors are flipped vertically and colors are a bit saturated
    if (s->id.PID == OV2640_PID) {
    //        s->set_vflip(s, 1);//flip it back
    //        s->set_brightness(s, 1);//up the blightness just a bit
    //        s->set_contrast(s, 1);
    }
    Serial.print("Camera Init OK");
    return ESP_OK;
}
//**************************************************************************************************************************************  SD卡初始化参数
void sd_init()
{
  if(!SD_MMC.begin()){
    Serial.println("Card Mount Failed");
    return;
  }
  uint8_t cardType = SD_MMC.cardType();
  if(cardType == CARD_NONE){
    Serial.println("No SD card attached");
    return;
  }
  Serial.print("SD Card Type: ");
  if(cardType == CARD_MMC){
    Serial.println("MMC");
    } 
  else if(cardType == CARD_SD){  Serial.println("SDSC");  }
  else if(cardType == CARD_SDHC){  Serial.println("SDHC");  } 
  else {  Serial.println("UNKNOWN");  }
  
  uint64_t cardSize = SD_MMC.cardSize() / (1024 * 1024);    //获取SD卡大小，大小单位是MB
  Serial.printf("SD 卡容量大小: %lluMB\n", cardSize);  
  }
//**************************************************************************************************************************************  获取当前时间作为返回的函数部分
void get_time_path()  //获取目前时间返回字符串
{
    memset(timr_str, 0, sizeof(timr_str));
    configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
    if(!getLocalTime(&timeinfo))
    {
      Serial.println("Failed to obtain time");
      sprintf(timr_str, "/TIME_get_failed.jpg");
    }
    else
    {
      //Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
      Serial.print("现在时间是：");
      Serial.print("年份是：");Serial.println(timeinfo.tm_year + 1900);
      Serial.print("月份是：");Serial.println(timeinfo.tm_mon + 1);
      Serial.print("号数是：");Serial.println(timeinfo.tm_mday);
      Serial.print("小时数是：");Serial.println(timeinfo.tm_hour );  //中国区
      Serial.print("分钟数是：");Serial.println(timeinfo.tm_min);
      Serial.print("分钟数是：");Serial.println(timeinfo.tm_sec);
      sprintf(timr_str, "/%d_%d_%d_TIME_%d_%d_%d.jpg",timeinfo.tm_year+1900,timeinfo.tm_mon + 1,timeinfo.tm_mday,timeinfo.tm_hour,timeinfo.tm_min,timeinfo.tm_sec);
      }
  }
//**************************************************************************************************************************************  主函数部分
void setup() {
    Serial.begin(115200);
    wifi_connect();
    camera_init();  //摄像头初始化
    sd_init();  //SD卡初始化
    pinMode(16, INPUT_PULLUP); //设置按键管脚输入上拉模式
    Serial.println("16号IO拉低将会进行拍照!!!");
}

void loop() 
{
  if(digitalRead(16) == 0)
  {
    delay(60);  //延时消抖
    if(digitalRead(16) == 0)
    {
      //这里面的舵机就代表确认拉低IO16之后，我们将要拍照并且把图片保存到SD卡当中，而照片名字就保存为目前的时间
      Serial.println("即将进行拍照!!!");
      camera_fb_t * fb = esp_camera_fb_get();
      get_time_path();
      Serial.print("存入的图片名称为:");Serial.println(timr_str);
      path = timr_str;    
      if(fb == NULL)
      {
        Serial.println( "get picture failed");  //代表获取图片失败
        }
      else
      { 
         //char * path = time_str;
         //以下就是上一篇文章讲到的写入文件得到过程，但是一点点小区别
         fs::FS &fs = SD_MMC;
         Serial.printf("Writing file: %s\n", path);
         File file = fs.open(path, FILE_WRITE);
         if (!file) 
         {
           Serial.println("文件创建失败");
           }
         else
         {
           file.write(fb->buf , fb->len); //payload , lengte vd payload
           Serial.println("成功写入照片");
         }
         //return the frame buffer back to the driver for reuse
         esp_camera_fb_return(fb);
       }
     }
    }
  }
  

最后

接下来会继续更一些ESP32驱动一些外设的代码，还会更最重要的，ESP32连接阿里云物联网平台的方法（onenet我不喜欢用，也觉得不如阿里云，就是好像阿里贵一些，一分钱一分货把）