CAMERA_PIN, 如何使用esp32-cam和arduino UNO实现

要使用 ESP32-CAM 和 Arduino Uno 实现摄像头功能，需要完成以下步骤：

1. 连接 ESP32-CAM 到 Arduino Uno

将 ESP32-CAM 连接到 Arduino Uno 的引脚上。连接方式如下：

- ESP32-CAM VCC 引脚 -> Arduino Uno 5V 引脚
- ESP32-CAM GND 引脚 -> Arduino Uno GND 引脚
- ESP32-CAM U0T 引脚 -> Arduino Uno RX 引脚
- ESP32-CAM U0R 引脚 -> Arduino Uno TX 引脚

2. 配置 Arduino IDE 环境

在 Arduino IDE 中，需要安装 ESP32 开发板支持库以及 ESP32-CAM 库。在“文件”->“首选项”中添加以下网址到“附加开发板管理器网址”中：

https://dl.espressif.com/dl/package_esp32_index.json

然后在“工具”->“开发板”->“开发板管理器”中安装 ESP32 开发板支持库和 ESP32-CAM 库。

3. 上传代码

将以下代码上传到 Arduino Uno 中：

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

// Replace with your network credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// IP address to send captured images
IPAddress server(192, 168, 1, 100);

WiFiClient client;

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  Serial.println("Connected to WiFi");

  // Initialize camera
  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = 5;
  config.pin_d1 = 18;
  config.pin_d2 = 19;
  config.pin_d3 = 21;
  config.pin_d4 = 36;
  config.pin_d5 = 39;
  config.pin_d6 = 34;
  config.pin_d7 = 35;
  config.pin_xclk = 0;
  config.pin_pclk = 22;
  config.pin_vsync = 25;
  config.pin_href = 23;
  config.pin_sscb_sda = 26;
  config.pin_sscb_scl = 27;
  config.pin_pwdn = 32;
  config.pin_reset = -1;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;
  // Init with high specs to pre-allocate larger buffers
  if(psramFound()){
    config.frame_size = FRAMESIZE_UXGA;
    config.jpeg_quality = 10;
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }

  // 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;
  }

  // Drop down frame size for higher initial frame rate
  sensor_t * s = esp_camera_sensor_get();
  s->set_framesize(s, FRAMESIZE_QVGA);

  // Set up HTTP client
  if (client.connect(server, 80)) {
    Serial.println("Connected to server");
  }
}

void loop() {
  // Take a photo
  camera_fb_t * fb = esp_camera_fb_get();
  if (!fb) {
    Serial.println("Camera capture failed");
    return;
  }

  // Send photo to server
  if (client.connected()) {
    client.write("POST /upload HTTP/1.1\r\n");
    client.write("Host: 192.168.1.100\r\n");
    client.write("Content-Type: image/jpeg\r\n");
    client.write("Content-Length: " + String(fb->len) + "\r\n");
    client.write("\r\n");
    client.write(fb->buf, fb->len);
    client.write("\r\n");

    Serial.println("Photo sent to server");
  } else {
    Serial.println("Server disconnected");
  }

  // Free memory
  esp_camera_fb_return(fb);

  delay(5000);
}

将代码中的以下内容替换为你的网络凭证：

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

将以下内容替换为你的服务器 IP 地址：

IPAddress server(192, 168, 1, 100);

上传代码后，打开串口监视器并等待 ESP32-CAM 连接到 Wi-Fi 网络。然后它会自动拍摄照片并将其发送到指定的服务器。