ESP32

#ESP32| 来源: 网络整理| 查看: 265

这个礼拜到手了一个ESP32-CAM板子和SD卡，有摄像头、蓝牙、WIFI。目前先使用摄像头做个简单功能，实现每隔一段时间间隔可以拍照并保存到SD卡中。想法还是简单，而且已经有人实现好了，只需要在官方给出的样例中将拍照函数添加到循环中再延时即可。

但是在实现中发现每次拍照闪光灯都会闪烁一下，很刺眼。原本是直接使用原来的自带代码关闭闪光灯，但是拍照还是会闪烁，就觉得很奇怪。试了很多方法都关不掉，后来突然想到，应该是调用拍照的函数里面会调用闪光灯。遂上网查找相关资料，最后采用PWM将灯光拉低亮度至0解决。

Disabling auto flash on the ESP32 CAM? : r/esp32 (reddit.com)

功能：

每5秒拍照一次并存储到SD卡中，拍照时ESP32-CAM的LED会亮起，拍照存储完成后熄灭

代码：

/********* Rui Santos Complete project details at https://RandomNerdTutorials.com/esp32-cam-take-photo-save-microsd-card IMPORTANT!!! - Select Board "AI Thinker ESP32-CAM" - GPIO 0 must be connected to GND to upload a sketch - After connecting GPIO 0 to GND, press the ESP32-CAM on-board RESET button to put your board in flashing mode Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. *********/ #include "esp_camera.h" #include "Arduino.h" #include "FS.h" // SD Card ESP32 #include "SD_MMC.h" // SD Card ESP32 #include "soc/soc.h" // Disable brownour problems #include "soc/rtc_cntl_reg.h" // Disable brownour problems #include "driver/rtc_io.h" #include // read and write from flash memory // define the number of bytes you want to access #define EEPROM_SIZE 1 // Pin definition for 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 #define FLASH_GPIO_NUM 4 #define LED_GPIO_NUM 33 int pictureNumber = 0; void setup() { WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); //disable brownout detector ledcSetup(15, 2000, 8); ledcAttachPin(FLASH_GPIO_NUM, 15); Serial.begin(115200); //Serial.setDebugOutput(true); //Serial.println(); } void take_pictures(){ 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; if(psramFound()){ config.frame_size = FRAMESIZE_UXGA; // FRAMESIZE_ + QVGA|CIF|VGA|SVGA|XGA|SXGA|UXGA config.jpeg_quality = 10; config.fb_count = 2; } else { config.frame_size = FRAMESIZE_SVGA; config.jpeg_quality = 12; config.fb_count = 1; } // Init Camera 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(); s->set_brightness(s, 2); // 设置亮度，范围通常为 -2 到 2 s->set_contrast(s, 1);// 设置对比度，范围为 -2 到 2。0 表示不调整对比度。 s->set_saturation(s, 1); //设置饱和度，范围为 -2 到 2。0 表示不调整饱和度。 //Serial.println("Starting SD Card"); if(!SD_MMC.begin("/sdcard",true)){ Serial.println("SD Card Mount Failed"); return; } uint8_t cardType = SD_MMC.cardType(); if(cardType == CARD_NONE){ Serial.println("No SD Card attached"); return; } camera_fb_t * fb = NULL; // Take Picture with Camera ledcWrite(15,0); fb = esp_camera_fb_get(); if(!fb) { Serial.println("Camera capture failed"); return; } // initialize EEPROM with predefined size EEPROM.begin(EEPROM_SIZE); pictureNumber = EEPROM.read(0) + 1; // Path where new picture will be saved in SD Card //TODO 此处pictureNumber只能1-256循环需要改为无上限 String path = "/picture" + String(pictureNumber) +".jpg"; fs::FS &fs = SD_MMC; Serial.printf("Picture file name: %s\n", path.c_str()); 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()); EEPROM.write(0, pictureNumber); EEPROM.commit(); } file.close(); esp_camera_fb_return(fb); // Turns off the ESP32-CAM white on-board LED (flash) connected to GPIO 4 //pinMode(4, OUTPUT); //digitalWrite(4, LOW); //rtc_gpio_hold_en(GPIO_NUM_4);//低功耗保持状态 delay(2000); Serial.println("Going to sleep now"); //delay(2000); //esp_deep_sleep_start(); //Serial.println("This will never be printed"); Serial.println("finished!"); } void loop() { //Turn on LED pinMode(LED_GPIO_NUM,OUTPUT); digitalWrite(LED_GPIO_NUM,LOW); take_pictures(); //Turn off LED delay(200); digitalWrite(LED_GPIO_NUM,HIGH); delay(5000); }

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