/* HocLapTrinhRobot G3 04 - Ghi log khung hinh va dieu kien anh sang Board: ESP32-CAM AI Thinker Hardware: OV2640 camera, WiFi 2.4GHz */ #include #include #include "esp_camera.h" const char *WIFI_SSID = "TenMangWiFi"; const char *WIFI_PASSWORD = "MatKhauWiFi"; #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 WebServer server(80); uint32_t frameCount = 0; size_t lastBytes = 0; float lastMean = 0.0f; uint8_t lastMin = 0; uint8_t lastMax = 0; String lastLightState = "UNKNOWN"; bool initCamera() { 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_sccb_sda = SIOD_GPIO_NUM; config.pin_sccb_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_GRAYSCALE; config.frame_size = FRAMESIZE_QQVGA; config.jpeg_quality = 12; config.fb_count = 1; config.grab_mode = CAMERA_GRAB_LATEST; esp_err_t err = esp_camera_init(&config); Serial.print("camera init="); Serial.println(err == ESP_OK ? "OK" : "FAILED"); return err == ESP_OK; } String classifyLight(float meanValue) { if (meanValue < 40.0f) return "TOO_DARK"; if (meanValue > 200.0f) return "TOO_BRIGHT"; return "OK"; } bool captureStats() { camera_fb_t *frame = esp_camera_fb_get(); if (!frame) { Serial.println("frame=FAILED"); return false; } uint32_t total = 0; uint8_t minValue = 255; uint8_t maxValue = 0; for (size_t i = 0; i < frame->len; i++) { uint8_t value = frame->buf[i]; total += value; if (value < minValue) minValue = value; if (value > maxValue) maxValue = value; } frameCount++; lastBytes = frame->len; lastMean = total / (float)frame->len; lastMin = minValue; lastMax = maxValue; lastLightState = classifyLight(lastMean); esp_camera_fb_return(frame); Serial.print("frame="); Serial.print(frameCount); Serial.print(" bytes="); Serial.print(lastBytes); Serial.print(" mean="); Serial.print(lastMean, 1); Serial.print(" min="); Serial.print(lastMin); Serial.print(" max="); Serial.print(lastMax); Serial.print(" light="); Serial.println(lastLightState); return true; } String buildStatsJson() { String json = "{"; json += "\"frame\":" + String(frameCount) + ","; json += "\"bytes\":" + String(lastBytes) + ","; json += "\"mean\":" + String(lastMean, 2) + ","; json += "\"min\":" + String(lastMin) + ","; json += "\"max\":" + String(lastMax) + ","; json += "\"light\":\"" + lastLightState + "\""; json += "}"; return json; } void handleRoot() { String html = ""; html += "G3 Frame Stats

G3 Frame Stats

Loading...

"; html += ""; html += ""; server.send(200, "text/html", html); } void handleStats() { captureStats(); server.send(200, "application/json", buildStatsJson()); } void connectWifi() { WiFi.mode(WIFI_STA); WiFi.begin(WIFI_SSID, WIFI_PASSWORD); unsigned long started = millis(); Serial.print("wifi connecting"); while (WiFi.status() != WL_CONNECTED && millis() - started < 15000) { Serial.print("."); delay(250); } Serial.println(); if (WiFi.status() == WL_CONNECTED) { Serial.print("stats url=http://"); Serial.print(WiFi.localIP()); Serial.println("/stats"); } else { Serial.println("wifi=FAILED"); } } void setupRoutes() { server.on("/", handleRoot); server.on("/stats", handleStats); server.begin(); } void setup() { Serial.begin(115200); delay(500); WiFi.persistent(false); WiFi.setSleep(false); initCamera(); connectWifi(); setupRoutes(); Serial.println("G3 04 frame stats ready"); } void loop() { server.handleClient(); static unsigned long lastSerialCaptureMs = 0; if (millis() - lastSerialCaptureMs >= 3000) { lastSerialCaptureMs = millis(); captureStats(); } }

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