嵌入式-手把手教你制作ESP32智能门铃（ESP32-S3、OV2640摄像头、蜂鸣器、舵机）

前言

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更详细的讲解请移步Bilibili：EDAdong。

设计目标和方案

（1）主控选用ESP32-S3，内部自带WIFI，摄像头选用OV2640；

（2）室内室外都分别有一个按键和蜂鸣器，其中按下室外的按键，室内和室外蜂鸣器都能鸣响；

（3）按下室内的按键，摄像头开启，通过手机查看图像；

（4）设置一个按键在室内，可以控制舵机完成开门动作；

（5）通过红外热释传感器检测室外是否有人，有人则室内LED灯点亮，提醒有人；

注意事项

需要事先通过ESP32自带的串口获得摄像头显示对应的网段，浏览器输入对应网段才能显示。需要链接同一个网络才可以实现显示。

原理图及实物图

代码

/**********************************************************************
  Filename    : Camera Web Server
  Description : The camera images captured by the ESP32S3 are displayed on the web page.
  Auther      : www.freenove.com
  Modification: 2022/10/31
**********************************************************************/
#include "esp_camera.h"
#include <WiFi.h>

// ===================
// Select camera model
// ===================
//#define CAMERA_MODEL_WROVER_KIT // Has PSRAM
//#define CAMERA_MODEL_ESP_EYE // Has PSRAM
#define CAMERA_MODEL_ESP32S3_EYE // Has PSRAM
//#define CAMERA_MODEL_M5STACK_PSRAM // Has PSRAM
//#define CAMERA_MODEL_M5STACK_V2_PSRAM // M5Camera version B Has PSRAM
//#define CAMERA_MODEL_M5STACK_WIDE // Has PSRAM
//#define CAMERA_MODEL_M5STACK_ESP32CAM // No PSRAM
//#define CAMERA_MODEL_M5STACK_UNITCAM // No PSRAM
//#define CAMERA_MODEL_AI_THINKER // Has PSRAM
//#define CAMERA_MODEL_TTGO_T_JOURNAL // No PSRAM
// ** Espressif Internal Boards **
//#define CAMERA_MODEL_ESP32_CAM_BOARD
//#define CAMERA_MODEL_ESP32S2_CAM_BOARD
//#define CAMERA_MODEL_ESP32S3_CAM_LCD

#include "camera_pins.h"
#include <ESP32Servo.h>//舵机库
#define camera_sw 1
#define motor_sw 2
#define doorbee_sw 42
#define beepin 41
#define beepout 40
#define duoji 39              
#define people 21 
#define ledout 47
// ===========================
// Enter your WiFi credentials
// ===========================
const char* ssid     = "SERS";
const char* password = "guodao2020";

int camerasw_status;//摄像头开关按键检测状态
int motorsw_status;//舵机开关按键检测状态
int doorbeesw_status;//门铃按键检测状态
int beep_status;//蜂鸣器状态
int duoji_status;//舵机状态
int people_status;//是否有人状态
Servo servo;                     //配置舵机函数
void servo_init(void)
{
  servo.setPeriodHertz(50);
  servo.attach(duoji,500,2500);
  servo.write(90);
  delay(500);
  Serial.println("舵机 初始化成功");
}

void startCameraServer();

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  Serial.println();

  pinMode(camera_sw, INPUT_PULLUP);              //定义按键口为上拉输入
  pinMode(motor_sw, INPUT_PULLUP);               //定义按键口为上拉输入 
  pinMode(doorbee_sw, INPUT_PULLUP);             //定义按键口为上拉输入
  pinMode(people, INPUT_PULLDOWN);               //定义按键口为下拉输入
  pinMode(beepin, OUTPUT);                       //定义输出端口
  pinMode(ledout, OUTPUT);                       //定义输出端口
  pinMode(beepout, OUTPUT);                      //定义输出端口 

  digitalWrite(beepin, LOW);                     //定义LED为低电平熄灭
  digitalWrite(beepout, LOW);                    //定义LED为低电平熄灭
  digitalWrite(ledout, LOW);                     //定义LED为低电平熄灭
  //舵机初始化
  servo_init();  
  //摄像头初始化
  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.frame_size = FRAMESIZE_UXGA;
  config.pixel_format = PIXFORMAT_JPEG; // for streaming
  config.grab_mode = CAMERA_GRAB_WHEN_EMPTY;
  config.fb_location = CAMERA_FB_IN_PSRAM;
  config.jpeg_quality = 12;
  config.fb_count = 1;
  
  // if PSRAM IC present, init with UXGA resolution and higher JPEG quality
  // for larger pre-allocated frame buffer.
  if(psramFound()){
    Serial.print("found psrame");
    config.jpeg_quality = 10;
    config.fb_count = 2;
    config.grab_mode = CAMERA_GRAB_LATEST;
  } else {
    // Limit the frame size when PSRAM is not available
    config.frame_size = FRAMESIZE_SVGA;
    config.fb_location = CAMERA_FB_IN_DRAM;
    Serial.print("not found psrame");
  }

  // 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
  s->set_vflip(s, 1); // flip it back
  s->set_brightness(s, 1); // up the brightness just a bit
  s->set_saturation(s, 0); // lower the saturation
  
  WiFi.begin(ssid, password);
  WiFi.setSleep(false);

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

void loop() {
  //按键打开摄像头
  camerasw_status = digitalRead(camera_sw);
  motorsw_status = digitalRead(motor_sw);
  people_status = digitalRead(people);   
  doorbeesw_status = digitalRead(doorbee_sw);      
  if(camerasw_status==0)
  {
    startCameraServer();
    Serial.print("Camera Ready! Use 'http://");
    Serial.print(WiFi.localIP());
    Serial.println("' to connect");
  }
  if(motorsw_status==0)
  {
    duoji_status=!duoji_status;
  }
  if(duoji_status==0)
  {
    servo.write(180);                                                                                                                        
  }
  else
  {
    servo.write(90);
  }
  if(people_status)
  {
    digitalWrite(ledout, HIGH);                     //定义LED为低电平熄灭    
  }
  else
  {
    digitalWrite(ledout, LOW);                     //定义LED为低电平熄灭 
  }
    
  if(doorbeesw_status==0)
  {
    digitalWrite(beepin, HIGH);                     //定义LED为低电平熄灭
    digitalWrite(beepout, HIGH);                    //定义LED为低电平熄灭   
  } 
  else
  {
    digitalWrite(beepin, LOW);                     //定义LED为低电平熄灭
    digitalWrite(beepout, LOW);                    //定义LED为低电平熄灭   
  }
  delay(200);
}

总结

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