initial

README.md

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+# IoT Image Publishing
+
+Illustration of WebCam using ESP32_CAM via Adruino
+
+* [MCU comparison](./docs/MCU.md)
+* [WebCAM ESP32_CAM](./docs/WebCam_CSI.md)
+* [LoRA](./docs/LoRA.md)

docs/LoRA.md

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+# LoRA
+
+## Characteristic
+* Low Power (Battery Power)
+* Low Bandwidth, Low Speed, Long Range (km)
+* Network
+
+## Application
+* Low Frequency data acquicition
+* 

docs/MCU.md

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+# Comparison
+
+
+| MCU        | CPU           | GPIO  | Wireless| Cost |
+| ------------- |:-------------:| -----:|------|------| 
+| Raspberry Pi W      | Quad Core | 36 | WiFi / Bluetooth | S$15 |
+| ESP32_CAM           | Single Core | 36 | WiFi / Bluetooth | S$10 |
+
+
+

docs/WebCam_CSI.md

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+
+
+## CameraWebServer_ESP32-CAM.ino
+
+* Configure WiFi SSID
+```
+const char* ssid = "Your SSID";
+const char* password = "Your Password";
+```
+
+* Setup Camera CSI pin assignment
+```
+  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;
+
+```
+
+* Connect WiFi network
+```
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+```
+
+* Start httpd Web Camera Server
+```
+  startCameraServer();
+
+```
+
+## app_httpd.cpp
+* Setup Web Server endpoint
+```
+    if (httpd_start(&camera_httpd, &config) == ESP_OK) {
+        httpd_register_uri_handler(camera_httpd, &index_uri);
+        httpd_register_uri_handler(camera_httpd, &cmd_uri);
+        httpd_register_uri_handler(camera_httpd, &status_uri);
+        httpd_register_uri_handler(camera_httpd, &capture_uri);
+    }
+```
+
+* index landing page callback to read camera source and publish camera image
+```
+static esp_err_t index_handler(httpd_req_t *req){
+    httpd_resp_set_type(req, "text/html");
+    httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
+    sensor_t * s = esp_camera_sensor_get();
+    if (s->id.PID == OV3660_PID) {
+        return httpd_resp_send(req, (const char *)index_ov3660_html_gz, index_ov3660_html_gz_len);
+    }
+    return httpd_resp_send(req, (const char *)index_ov2640_html_gz, index_ov2640_html_gz_len);
+}
+```
+
+* streaming of camera source
+```
+static esp_err_t stream_handler(httpd_req_t *req){
+    camera_fb_t * fb = NULL;
+    esp_err_t res = ESP_OK;
+    size_t _jpg_buf_len = 0;
+
+```