ESP32 使用ESP32

2024-07-10 15:53| 来源: 网络整理| 查看: 265

实验效果

本文凌顺实验室(lingshunlab.com)主要分享使用官方的摄像头例子程序，实现ESP32-CAM（ESP32摄像头）在网页中实时显示画面，并且使用人脸识别的方法。

元件说明

esp32-cam

ESP32-CAM是一款非常细小尺寸的摄像头开发板，仅有27 x 40.5 x 4.5 mm大小，可以作为一个系统独立运行，深度睡眠电流只达到6mA。 ESP-32CAM广泛运用在各种物联网的开发，它适用于家庭智能设备、工业无线控制、无线监控、QR无线识别、无线定位系统信号和其他物联网应用。它是物联网应用的一个理想解决方桉。 ESP-32CAM采用DIP封装，可直接插入背板，实现产品的快速生产，为用户提供简单可靠性的开发方式，便于应用于各种物联网硬件终端。

注意：

购买ESP32-CAM模块的时候，如果是新手的话，建议连底板一起购买，

这样的话，直接接USB数据线就可以刷程序了。

省时间，省钱（省去看怎么接线，接上线的时间，时间就是金钱），省心（接错线轻则无反应，重则烧板子）

．主要用途：制作监控设备、机器人镜头、人面辨识系统

．产品特性： – 最小的802.11b/g/n Wi-Fi BT SoC模块 – 低功耗32位CPU，也可作为应用处理器使用 – 高达160MHz的时钟速度，综合计算能力高达600 DMIPS – 内置520KB SRAM，外置4MPSRAM – 支援UART/SPI/I2C/PWM/ADC/DAC – 支援OV2640和OV7670相机，内置Flash灯。 – 支援图像WiFI上传 – 支援TF卡 – 支援多种睡眠模式。 – 嵌入式Lwip和FreeRTOS – 支援STA/AP/STA+AP操作模式 – 支援智能配置/AirKiss技术 – 支援串口本地和远程固件升级（FOTA）

．商品规格：尺寸：40.5274.5mm 重量：20g 电压：3V 封装：DIP-16 SPI Flash：32Mbit 内存：520KB SRAM + 4M PSRAM 接口型式：UART、SPI、I2C、PWM 支援TF卡：Micro-SD IO接口：9个图像输出格式：JPEG(仅OV2640支持)，BMP，Crayscale 天线形式：板载PCB天线，增益2dBi 发射功率：802.11b: 17±2 dBm (@11Mbps) 供电电压：5V 蓝牙：Bluetooth 4.2 BR / EDR 和 BLE standards Wi-Fi：802.11 b/g/n/ 安全制式：WPA/WPA2/WPA2-Enterprise/WPS

程序代码

其实，在Arduino IDE中的ESP32的例子中，就有摄像头的代码

WX20230823-1158502x

代码如下：

// welcome to lingshunlab.com #include "esp_camera.h" #include // // 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 = "**********"; // 这里需要修改成你的WIFI名称 const char* password = "**********"; // 修改成你的WIFI密码 void startCameraServer(); 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 WiFi.begin(ssid, password); WiFi.setSleep(false); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); 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); }

上传代码前，请参考以下开发板配置：

WX20230823-1252402x