#include #include #include #include "esp_camera.h" // ===== Wi-Fi settings ===== const char* WIFI_SSID = "xxxxx"; const char* WIFI_PASS = "xxxxxx"; // ===== Button input ===== static const int SW_PIN = D4; // ===== XIAO ESP32S3 Sense + OV2640 ===== #define PWDN_GPIO_NUM -1 #define RESET_GPIO_NUM -1 #define XCLK_GPIO_NUM 10 #define SIOD_GPIO_NUM 40 #define SIOC_GPIO_NUM 39 #define Y9_GPIO_NUM 48 #define Y8_GPIO_NUM 11 #define Y7_GPIO_NUM 12 #define Y6_GPIO_NUM 14 #define Y5_GPIO_NUM 16 #define Y4_GPIO_NUM 18 #define Y3_GPIO_NUM 17 #define Y2_GPIO_NUM 15 #define VSYNC_GPIO_NUM 38 #define HREF_GPIO_NUM 47 #define PCLK_GPIO_NUM 13 WebServer server(80); void handleCaptureRequest(); // forward declaration // Last saved frame uint8_t* lastShotBuf = nullptr; size_t lastShotLen = 0; // Button interrupt flag volatile bool captureRequested = false; volatile unsigned long lastInterruptTime = 0; void IRAM_ATTR buttonISR() { unsigned long now = millis(); if (now - lastInterruptTime > 200) { // 200ms debounce captureRequested = true; lastInterruptTime = now; } } void freeLastShot() { if (lastShotBuf != nullptr) { free(lastShotBuf); lastShotBuf = nullptr; lastShotLen = 0; } } bool storeFrameAsShot(const uint8_t* buf, size_t len) { if (buf == nullptr || len == 0) return false; uint8_t* newBuf = (uint8_t*)malloc(len); if (!newBuf) { Serial.println("malloc failed"); return false; } memcpy(newBuf, buf, len); freeLastShot(); lastShotBuf = newBuf; lastShotLen = len; Serial.print("Shot updated: "); Serial.print((unsigned int)lastShotLen); Serial.println(" bytes"); return true; } bool captureAndStoreShot() { camera_fb_t* fb = esp_camera_fb_get(); if (!fb) { Serial.println("Capture failed"); return false; } if (fb->format != PIXFORMAT_JPEG) { Serial.println("Frame is not JPEG"); esp_camera_fb_return(fb); return false; } bool ok = storeFrameAsShot(fb->buf, fb->len); esp_camera_fb_return(fb); return ok; } void handleRoot() { String html = "" "XIAO Camera" "

XIAO ESP32S3 Sense Camera

" "

Open live stream

" "

View last shot

" "

Capture now

" "

Press the hardware switch to save the current frame.

" "

" ""; server.send(200, "text/html; charset=utf-8", html); } void handleShot() { if (lastShotBuf == nullptr || lastShotLen == 0) { server.send(404, "text/plain; charset=utf-8", "No shot captured yet"); return; } server.sendHeader("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0"); server.sendHeader("Pragma", "no-cache"); server.setContentLength(lastShotLen); server.send(200, "image/jpeg", ""); server.sendContent((const char*)lastShotBuf, lastShotLen); } void handleCapture() { bool ok = captureAndStoreShot(); if (ok) { server.send(200, "text/plain; charset=utf-8", "Captured"); } else { server.send(500, "text/plain; charset=utf-8", "Capture failed"); } } void handleStream() { WiFiClient client = server.client(); client.print( "HTTP/1.1 200 OK\r\n" "Content-Type: multipart/x-mixed-replace; boundary=frame\r\n" "Cache-Control: no-store, no-cache, must-revalidate, max-age=0\r\n" "Pragma: no-cache\r\n" "Connection: close\r\n\r\n" ); while (client.connected()) { camera_fb_t* fb = esp_camera_fb_get(); if (!fb) { Serial.println("Stream capture failed"); delay(30); continue; } if (fb->format != PIXFORMAT_JPEG) { esp_camera_fb_return(fb); delay(30); continue; } client.print("--frame\r\n"); client.print("Content-Type: image/jpeg\r\n"); client.print("Content-Length: "); client.print(fb->len); client.print("\r\n\r\n"); client.write(fb->buf, fb->len); client.print("\r\n"); esp_camera_fb_return(fb); handleCaptureRequest(); // also handle button during stream if (!client.connected()) break; delay(80); } } 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_JPEG; config.frame_size = FRAMESIZE_QVGA; config.jpeg_quality = 15; config.fb_count = 1; config.grab_mode = CAMERA_GRAB_LATEST; esp_err_t err = esp_camera_init(&config); if (err != ESP_OK) { Serial.printf("esp_camera_init failed: 0x%x\n", err); return false; } sensor_t* s = esp_camera_sensor_get(); if (s) { s->set_vflip(s, 1); s->set_brightness(s, 1); s->set_saturation(s, 0); } return true; } void connectWiFi() { WiFi.mode(WIFI_STA); WiFi.begin(WIFI_SSID, WIFI_PASS); Serial.print("Connecting to Wi-Fi"); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(); Serial.print("Wi-Fi connected. IP: "); Serial.println(WiFi.localIP()); } void handleCaptureRequest() { if (captureRequested) { captureRequested = false; Serial.println("Button pressed -> capture"); bool ok = captureAndStoreShot(); Serial.println(ok ? "Capture success" : "Capture failed"); } } void setup() { Serial.begin(115200); delay(2000); Serial.println("DIRECT_CAPTURE_VERSION"); Serial.println("setup start"); pinMode(SW_PIN, INPUT); // assumes external pull-up attachInterrupt(digitalPinToInterrupt(SW_PIN), buttonISR, FALLING); if (!initCamera()) { while (true) { delay(1000); } } connectWiFi(); // Capture one frame on startup captureAndStoreShot(); server.on("/", HTTP_GET, handleRoot); server.on("/stream", HTTP_GET, handleStream); server.on("/shot", HTTP_GET, handleShot); server.on("/capture", HTTP_GET, handleCapture); server.begin(); Serial.println("Camera server started"); Serial.print("Root : http://"); Serial.println(WiFi.localIP()); Serial.print("Stream : http://"); Serial.print(WiFi.localIP()); Serial.println("/stream"); Serial.print("Shot : http://"); Serial.print(WiFi.localIP()); Serial.println("/shot"); } void loop() { handleCaptureRequest(); server.handleClient(); delay(5); }