ESP32开源项目基于esp32cam制作的迷你监控，可以通过app远程查看
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【ESP32开源项目】基于esp32cam制作的迷你监控，可以通过app远程查看
- 视频演示
基于esp32cam制作一个迷你监控，可以通过app远程查看
- 本项目是基于Arduino开发平台
- 开发板型号
- 编译信息
使用 1.0 版本的库 WiFi 在文件夹： C:\\Users\\Administrator\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\libraries\\WiFi
使用 1.0 版本的库 WebServer 在文件夹： C:\\Users\\Administrator\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\libraries\\WebServer
使用 1.0 版本的库 FS 在文件夹： C:\\Users\\Administrator\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\libraries\\FS
"C:\\\\Users\\\\Administrator\\\\AppData\\\\Local\\\\Arduino15\\\\packages\\\\esp32\\\\tools\\\\xtensa-esp32-elf-gcc\\\\1.22.0-97-gc752ad5-5.2.0/bin/xtensa-esp32-elf-size" -A "d:\\\\arduino\\\\MyHexDir/esp32_camera_mjpeg_multiclient.ino.elf"
项目使用了 866298 字节，占用了 (27%) 程序存储空间。最大为 3145728 字节。
全局变量使用了43764字节，(13%)的动态内存，余留283916字节局部变量。最大为327680字节。
项目架构
相关参数
- 帧速率参数
根据个人使用情况设置，最高
25FPS
//设置帧速率，最高达到25fps的帧率
// We will try to achieve 25 FPS frame rate
const int FPS = 7;
-wifi参数需要自己设置
- 实际上没有使用到的头文件
#include "home_wifi_multi.h"，如果需要将wifi信息单独放需要自己修改setup函数里面相关wifi初始化的代码。 - wifi信息，是需要自己手动填写上去的。
WiFi.mode(WIFI_STA);
WiFi.begin("wifi账号", "wifi密码");//WIFI名称和密码
Serial.print("Connecting to WiFi");
主程序代码
/*
This is a simple MJPEG streaming webserver implemented for AI-Thinker ESP32-CAM
and ESP-EYE modules.
This is tested to work with VLC and Blynk video widget and can support up to 10
simultaneously connected streaming clients.
Simultaneous streaming is implemented with FreeRTOS tasks.
Inspired by and based on this Instructable: $9 RTSP Video Streamer Using the ESP32-CAM Board
(https://www.instructables.com/id/9-RTSP-Video-Streamer-Using-the-ESP32-CAM-Board/)
Board: AI-Thinker ESP32-CAM or ESP-EYE
Compile as:
ESP32 Dev Module
CPU Freq: 240
Flash Freq: 80
Flash mode: QIO
Flash Size: 4Mb
Patrition: Minimal SPIFFS
PSRAM: Enabled
*/
// ESP32 has two cores: APPlication core and PROcess core (the one that runs ESP32 SDK stack)
#define APP_CPU 1
#define PRO_CPU 0
#include "OV2640.h"
#include <WiFi.h>
#include <WebServer.h>
#include <WiFiClient.h>
#include <esp_bt.h>
#include <esp_wifi.h>
#include <esp_sleep.h>
#include <driver/rtc_io.h>
// Select camera model
//#define CAMERA_MODEL_WROVER_KIT
//#define CAMERA_MODEL_ESP_EYE
//#define CAMERA_MODEL_M5STACK_PSRAM
//#define CAMERA_MODEL_M5STACK_WIDE
#define CAMERA_MODEL_AI_THINKER
#include "camera_pins.h"
/*
Next one is an include with wifi credentials.
This is what you need to do:
1. Create a file called "home_wifi_multi.h" in the same folder OR under a separate subfolder of the "libraries" folder of Arduino IDE. (You are creating a "fake" library really - I called it "MySettings").
2. Place the following text in the file:
#define SSID1 "replace with your wifi ssid"
#define PWD1 "replace your wifi password"
3. Save.
Should work then
*/
#include "home_wifi_multi.h"
OV2640 cam;
WebServer server(80);
// ===== rtos task handles =========================
// Streaming is implemented with 3 tasks:
TaskHandle_t tMjpeg; // handles client connections to the webserver
TaskHandle_t tCam; // handles getting picture frames from the camera and storing them locally
TaskHandle_t tStream; // actually streaming frames to all connected clients
// frameSync semaphore is used to prevent streaming buffer as it is replaced with the next frame
SemaphoreHandle_t frameSync = NULL;
// Queue stores currently connected clients to whom we are streaming
QueueHandle_t streamingClients;
// We will try to achieve 25 FPS frame rate
const int FPS = 7;
// We will handle web client requests every 50 ms (20 Hz)
const int WSINTERVAL = 100;
// ======== Server Connection Handler Task ==========================
void mjpegCB(void* pvParameters)
TickType_t xLastWakeTime;
const TickType_t xFrequency = pdMS_TO_TICKS(WSINTERVAL);
// Creating frame synchronization semaphore and initializing it
frameSync = xSemaphoreCreateBinary();
xSemaphoreGive( frameSync );
// Creating a queue to track all connected clients
streamingClients = xQueueCreate( 10, sizeof(WiFiClient*) );
//=== setup section ==================
// Creating RTOS task for grabbing frames from the camera
xTaskCreatePinnedToCore(
camCB, // callback
"cam", // name
4096, // stacj size
NULL, // parameters
2, // priority
&tCam, // RTOS task handle
APP_CPU); // core
// Creating task to push the stream to all connected clients
xTaskCreatePinnedToCore(
streamCB,
"strmCB",
4 * 1024,
NULL, //(void*) handler,
2,
&tStream,
APP_CPU);
// Registering webserver handling routines
server.on("/mjpeg/1", HTTP_GET, handleJPGSstream);
server.on("/jpg", HTTP_GET, handleJPG);
server.onNotFound(handleNotFound);
// Starting webserver
server.begin();
//=== loop() section ===================
xLastWakeTime = xTaskGetTickCount();
for (;;)
server.handleClient();
// After every server client handling request, we let other tasks run and then pause
taskYIELD();
vTaskDelayUntil(&xLastWakeTime, xFrequency);
// Commonly used variables:
volatile size_t camSize; // size of the current frame, byte
volatile char* camBuf; // pointer to the current frame
// ==== RTOS task to grab frames from the camera =========================
void camCB(void* pvParameters)
TickType_t xLastWakeTime;
// A running interval associated with currently desired frame rate
const TickType_t xFrequency = pdMS_TO_TICKS(1000 / FPS);
// Mutex for the critical section of swithing the active frames around
portMUX_TYPE xSemaphore = portMUX_INITIALIZER_UNLOCKED;
// Pointers to the 2 frames, their respective sizes and index of the current frame
char* fbs[2] = NULL, NULL ;
size_t fSize[2] = 0, 0 ;
int ifb = 0;
//=== loop() section ===================
xLastWakeTime = xTaskGetTickCount();
for (;;)
// Grab a frame from the camera and query its size
cam.run();
size_t s = cam.getSize();
// If frame size is more that we have previously allocated - request 125% of the current frame space
if (s > fSize[ifb])
fSize[ifb] = s * 4 / 3;
fbs[ifb] = allocateMemory(fbs[ifb], fSize[ifb]);
// Copy current frame into local buffer
char* b = (char*) cam.getfb();
memcpy(fbs[ifb], b, s);
// Let other tasks run and wait until the end of the current frame rate interval (if any time left)
taskYIELD();
vTaskDelayUntil(&xLastWakeTime, xFrequency);
// Only switch frames around if no frame is currently being streamed to a client
// Wait on a semaphore until client operation completes
xSemaphoreTake( frameSync, portMAX_DELAY );
// Do not allow interrupts while switching the current frame
portENTER_CRITICAL(&xSemaphore);
camBuf = fbs[ifb];
camSize = s;
ifb++;
ifb &= 1; // this should produce 1, 0, 1, 0, 1 ... sequence
portEXIT_CRITICAL(&xSemaphore);
// Let anyone waiting for a frame know that the frame is ready
xSemaphoreGive( frameSync );
// Technically only needed once: let the streaming task know that we have at least one frame
// and it could start sending frames to the clients, if any
xTaskNotifyGive( tStream );
// Immediately let other (streaming) tasks run
taskYIELD();
// If streaming task has suspended itself (no active clients to stream to)
// there is no need to grab frames from the camera. We can save some juice
// by suspedning the tasks
if ( eTaskGetState( tStream ) == eSuspended )
vTaskSuspend(NULL); // passing NULL means "suspend yourself"
// ==== Memory allocator that takes advantage of PSRAM if present =======================
char* allocateMemory(char* aPtr, size_t aSize)
// Since current buffer is too smal, free it
if (aPtr != NULL) free(aPtr);
size_t freeHeap = ESP.getFreeHeap();
char* ptr = NULL;
// If memory requested is more than 2/3 of the currently free heap, try PSRAM immediately
if ( aSize > freeHeap * 2 / 3 )
if ( psramFound() && ESP.getFreePsram() > aSize )
ptr = (char*) ps_malloc(aSize);
else
// Enough free heap - let's try allocating fast RAM as a buffer
ptr = (char*) malloc(aSize);
// If allocation on the heap failed, let's give PSRAM one more chance:
if ( ptr == NULL && psramFound() && ESP.getFreePsram() > aSize)
ptr = (char*) ps_malloc(aSize);
// Finally, if the memory pointer is NULL, we were not able to allocate any memory, and that is a terminal condition.
if (ptr == NULL)
ESP.restart();
return ptr;
// ==== STREAMING ======================================================
const char HEADER[] = "HTTP/1.1 200 OK\\r\\n" \\
"Access-Control-Allow-Origin: *\\r\\n" \\
"Content-Type: multipart/x-mixed-replace; boundary=123456789000000000000987654321\\r\\n";
const char BOUNDARY[] = "\\r\\n--123456789000000000000987654321\\r\\n";
const char CTNTTYPE[] = "Content-Type: image/jpeg\\r\\nContent-Length: ";
const int hdrLen = strlen(HEADER);
const int bdrLen = strlen(BOUNDARY);
const int cntLen = strlen(CTNTTYPE);
// ==== Handle connection request from clients ===============================
void handleJPGSstream(void)
// Can only acommodate 10 clients. The limit is a default for WiFi connections
if ( !uxQueueSpacesAvailable(streamingClients) ) return;
// Create a new WiFi Client object to keep track of this one
WiFiClient* client = new WiFiClient();
*client = server.client();
// Immediately send this client a header
client->write(HEADER, hdrLen);
client->write(BOUNDARY, bdrLen);
// Push the client to the streaming queue
xQueueSend(streamingClients, (void *) &client, 0);
// Wake up streaming tasks, if they were previously suspended:
if ( eTaskGetState( tCam ) == eSuspended ) vTaskResume( tCam );
if ( eTaskGetState( tStream ) == eSuspended ) vTaskResume( tStream );
// ==== Actually stream content to all connected clients ========================
void streamCB(void * pvParameters)
char buf[16];
TickType_t xLastWakeTime;
TickType_t xFrequency;
// Wait until the first frame is captured and there is something to send
// to clients
ulTaskNotifyTake( pdTRUE, /* Clear the notification value before exiting. */
portMAX_DELAY ); /* Block indefinitely. */
xLastWakeTime = xTaskGetTickCount();
for (;;)
// Default assumption we are running according to the FPS
xFrequency = pdMS_TO_TICKS(1000 / FPS);
// Only bother to send anything if there is someone watching
UBaseType_t activeClients = uxQueueMessagesWaiting(streamingClients);
if ( activeClients )
// Adjust the period to the number of connected clients
xFrequency /= activeClients;
// Since we are sending the same frame to everyone,
// pop a client from the the front of the queue
WiFiClient *client;
xQueueReceive (streamingClients, (void*) &client, 0);
// Check if this client is still connected.
if (!client->connected())
// delete this client reference if s/he has disconnected
// and don't put it back on the queue anymore. Bye!
delete client;
else
// Ok. This is an actively connected client.
// Let's grab a semaphore to prevent frame changes while we
// are serving this frame
xSemaphoreTake( frameSync, portMAX_DELAY );
client->write(CTNTTYPE, cntLen);
sprintf(buf, "%d\\r\\n\\r\\n", camSize);
client->write(buf, strlen(buf));
client->write((char*) camBuf, (size_t)camSize);
client->write(BOUNDARY, bdrLen);
// Since this client is still connected, push it to the end
// of the queue for further processing
xQueueSend(streamingClients, (void *) &client, 0);
// The frame has been served. Release the semaphore and let other tasks run.
// If there is a frame switch ready, it will happen now in between frames
xSemaphoreGive( frameSync );
taskYIELD();
else
// Since there are no connected clients, there is no reason to waste battery running
vTaskSuspend(NULL);
// Let other tasks run after serving every client
taskYIELD();
vTaskDelayUntil(&xLastWakeTime, xFrequency);
const char JHEADER[] = "HTTP/1.1 200 OK\\r\\n" \\
"Content-disposition: inline; filename=capture.jpg\\r\\n" \\
"Content-type: image/jpeg\\r\\n\\r\\n";
const int jhdLen = strlen(JHEADER);
// ==== Serve up one JPEG frame =============================================
void handleJPG(void)
WiFiClient client = server.client();
if (!client.connected()) return;
cam.run();
client.write(JHEADER, jhdLen);
client.write((char*)cam.getfb(), cam.getSize());
// ==== Handle invalid URL requests ============================================
void handleNotFound()
String message = "Server is running!\\n\\n";
message += "URI: ";
message += server.uri();
message += "\\nMethod: ";
message += (server.method() == HTTP_GET) ? "GET" : "POST";
message += "\\nArguments: ";
message += server.args();
message += "\\n";
server.send(200, "text / plain", message);
// ==== SETUP method ==================================================================
void setup()
// Setup Serial connection:
Serial.begin(115200);
delay(1000); // wait for a second to let Serial connect
// Configure the camera
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;
// Frame parameters: pick one
// config.frame_size = FRAMESIZE_UXGA;
// config.frame_size = FRAMESIZE_SVGA;
// config.frame_size = FRAMESIZE_QVGA;
config.frame_size = FRAMESIZE_VGA;
config.jpeg_quality = 12;
config.fb_count = 2;
#if defined(CAMERA_MODEL_ESP_EYE)
pinMode(13, INPUT_PULLUP);
pinMode(14, INPUT_PULLUP);
#endif
if (cam.init(config) != ESP_OK)
Serial.println("Error initializing the camera");
delay(10000);
ESP.restart();
// Configure and connect to WiFi
IPAddress ip;
WiFi.mode(WIFI_STA);
WiFi.begin("wifi账号", "wifi密码");//WIFI名称和密码
Serial.print("Connecting to WiFi");
while (WiFi.status() != WL_CONNECTED)
delay(500);
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