# 創建Blynk監控相機使用ESP32-CAM
> [color=#40f1ef][name=LHB阿好伯, 2020/12/09][:earth_africa:](https://www.facebook.com/LHB0222/)
###### tags: `創客` `Arduino` `Blynk`

[TOC]

# 創建Blynk專案與軟體介面


今天來分享如何使用ESP32-Cam 來作為監控設備
並利用Blynk app作為查看設備
首先需要先創立新的專案
加入一個按鈕與圖片視窗

https://youtu.be/rJUqpaKvf30

# 燒錄Esp32-Cam

## 燒錄
### 使用USB to TTL模組依照下方接線方式進入燒錄模式

### 選擇開發板ESP32 Wrover Module


#### 安裝ESP32開發板資料
在偏好設定中添加額外的開發板
:::danger
https://dl.espressif.com/dl/package_esp32_index.json
:::

安裝ESP32開發板

### 選擇適當串口

### 選擇好其他條件就可以進行燒錄

## 收取 Blynk Auth Token
前面軟體介面設定好後須到Email收取Blynk Auth Token
之後會用在ESP32的程式碼中

## 修改與燒入程式碼
將家中網路帳號密碼與信箱中Blynk Auth Token
填入下方程式碼19~21行

//Viral Science www.youtube.com/c/viralscience  www.viralsciencecreativity.com
//Blynk ESP32 CAM Simple Monitor System
//While Uploading Code on ESP32 Board 1, comment the lines number: 17,36 and Uncomment lines: 16,35


#include "esp_camera.h"
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

// Select camera model
#define CAMERA_MODEL_AI_THINKER // Has PSRAM

#include "camera_pins.h"
#define PHOTO 14      //ESP32 控制開關
#define LED 4         //閃光燈腳位


const char* ssid = "-------------";       //wifi 名稱
const char* password = "-------------";       //wifi 密碼
char auth[] = "-------------";          //Blynk Auth Token 請看Email

String local_IP;
int count = 0;
void startCameraServer();

void takePhoto()
{
  digitalWrite(LED, HIGH);
  delay(200);
  uint32_t randomNum = random(50000);
  Serial.println("http://"+local_IP+"/capture?_cb="+ (String)randomNum);
  Blynk.setProperty(V1, "urls", "http://"+local_IP+"/capture?_cb="+(String)randomNum); //ESP32 CAM 1
  digitalWrite(LED, LOW);
  delay(1000);
}

void setup() {
  Serial.begin(115200);
  pinMode(LED,OUTPUT);
  Serial.setDebugOutput(true);
  Serial.println();
  
  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;
  
  // if PSRAM IC present, init with UXGA resolution and higher JPEG quality
  //                      for larger pre-allocated frame buffer.
  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;
  }

  sensor_t * s = esp_camera_sensor_get();
  // initial sensors are flipped vertically and colors are a bit saturated
  if (s->id.PID == OV3660_PID) {
    s->set_vflip(s, 1); // flip it back
    s->set_brightness(s, 1); // up the brightness just a bit
    s->set_saturation(s, -2); // lower the saturation
  }
  // drop down frame size for higher initial frame rate
  s->set_framesize(s, FRAMESIZE_QVGA);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  startCameraServer();

  Serial.print("Camera Ready! Use 'http://");
  Serial.print(WiFi.localIP());
  local_IP = WiFi.localIP().toString();
  Serial.println("' to connect");
  Blynk.begin(auth, ssid, password);
}

void loop() {
  // put your main code here, to run repeatedly:
  Blynk.run();
  if(digitalRead(PHOTO) == HIGH){
    takePhoto();
    }
  
}

#### 燒錄

移除燒錄線接上電源開啟序列監控視窗查看是否有成功燒錄



# 測試
最後開啟Blynk進行測試

# 參考資料

https://www.youtube.com/watch?v=PaiDT1t07DU
https://www.viralsciencecreativity.com/post/esp32-cam-blynk-multiple-camera-surveillance
https://blynk.io/

# 後續規劃
將圖像從ESP32-CAM發送到Telegram作為警報系統
https://www.survivingwithandroid.com/telegram-esp32-cam-send-image-arduino-ide/
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