需求：

做一个小型的监控，类似电子猫眼，监测到人之后，取一张图 然后发送到自己的邮箱。

架构：

1.sr602 传感器监测到人

2. esp32 cam 取图 并通过mqtt协议传到远端服务器

3, 服务器利用python 搭建一个mqtt客户端，订阅到数据后 将图片保存，并发送到指定邮箱

 硬件连接：

结构设计：

 

软件：

服务端代码

#mqtt客户端
import paho.mqtt.client as mqtt
import logging
import os
import email_sendAPPEAR_TOPIC = "APPEAR_TOPIC"
DETAIL_TOPIC = "DETAIL_TOPIC"
mqtt_server = 'xxxxxxxxxx'
image_path="images"image_index=0def on_connect(client, userdata, flags, rc):logging.info('连接到MQTT服务器 '+str(rc))def on_message(client, userdata, msg):print(msg.topic + " " + str(msg.payload))global image_indexif msg.topic ==APPEAR_TOPIC:if image_index!=0:#发送全部图片image_index=0email_send.send_email(image_path)logging.info('发送到邮箱完毕')if msg.topic == DETAIL_TOPIC:logging.info('收到图片,准备保存到本地')save_location = "images/"+str(image_index)+".jpg" f = open(save_location, 'wb') data = msg.payload f.write(data) f.close()image_index+=1logging.info('图片保存到本地完毕')def run():logging.basicConfig(level=logging.INFO)client = mqtt.Client(protocol=3)client.on_connect = on_connectclient.on_message = on_messageclient.connect(host=mqtt_server,port=1883,keepalive=60,bind_address="")client.subscribe(APPEAR_TOPIC)client.subscribe(DETAIL_TOPIC)logging.info('启动 MQTT客户端... \n')try:client.loop_forever()except KeyboardInterrupt:passlogging.info('停止 MQTT 客户端\n')if __name__ =='__main__':run()#邮件发送import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.base import MIMEBase
from email import encoders
from datetime import datetime
import logging
import os
import shutildef send_email(img_path=""):# 设置发件人、收件人和邮件主题from_email = "xxxx"to_email = "xxxx"subject = "注意,有人出现"logging.info('设置收发地址...')# 创建邮件对象msg = MIMEMultipart()msg['From'] = from_emailmsg['To'] = to_emailmsg['Subject'] = subject# 添加邮件正文body = datetime.now().strftime("%Y-%m-%d %H:%M:%S")msg.attach(MIMEText(body, 'plain'))logging.info('添加正文...')for root,dirs,files in os.walk(img_path):for file in files:if file.endswith(".jpg"):img = os.path.join(root,file)# 添加附件attachment_filename = imgattachment_path = imgattachment = open(attachment_path, "rb")part = MIMEBase('application', 'octet-stream')part.set_payload(attachment.read())encoders.encode_base64(part)part.add_header('Content-Disposition', f'attachment; filename= {attachment_filename}')msg.attach(part)          # 连接到SMTP服务器smtp_server = "smtp.yeah.net"  # 修改为你的SMTP服务器smtp_port = 465smtp_username = "xxxx"  # 修改为你的邮箱地址smtp_password = "xxxx"  # 修改为你的邮箱密码server = smtplib.SMTP_SSL(smtp_server,smtp_port)logging.info('登录邮件服务器...')server.login(smtp_username, smtp_password)logging.info('发送邮件')# 发送邮件server.sendmail(from_email, to_email, msg.as_string())# 关闭连接server.quit()shutil.rmtree(img_path)# 重新创建空文件夹os.makedirs(img_path)if __name__ =='__main__':logging.basicConfig(level=logging.INFO)send_email("images",True)

客户端代码

#include "esp_camera.h"
#include <WiFi.h>
#include <PubSubClient.h>#define CAMERA_MODEL_AI_THINKER
#include "camera_pins.h"//WIFI 用户名 密码
//const char* ssid = "xxxx";
//const char* password = "xxxx";
const char* ssid = "xxxx";
const char* password = "xxxx";//MQTT 服务器地址
const char* mqttServer = "xxxx";
uint16_t mqttPort = 1883;
const char* APPEAR_TOPIC = "APPEAR_TOPIC";
const char* DETAIL_TOPIC = "DETAIL_TOPIC";//检测是否有人
uint8_t FOUND_PEOPLE_PIN = 14;//人出现的次数
uint8_t found_count = 0;WiFiClient espClient;
PubSubClient client(espClient);void setup() {//调试串口Serial.begin(115200);Serial.setDebugOutput(true);//人体红外检测引脚pinMode(FOUND_PEOPLE_PIN, INPUT);//配置相机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_VGA;config.jpeg_quality = 10;config.fb_count = 1;// 相机初始化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();s->set_vflip(s, 1);s->set_brightness(s, 2);s->set_saturation(s, -2);s->set_framesize(s, FRAMESIZE_VGA);//连接 WIFIWiFi.begin(ssid, password);WiFi.setSleep(false);while (WiFi.status() != WL_CONNECTED) {Serial.println("Connecting to WIFI ...");delay(500);}Serial.println("WiFi connected");//连接mqtt 服务器。 640*480 图片大小client.setBufferSize(50 * 1024);client.setServer(mqttServer, mqttPort);while (!client.connected()) {if (client.connect("app")) {Serial.println("Connected to MQTT");} else {Serial.println("Failed to connect to MQTT server, ");Serial.print(client.state());delay(1000);}}Serial.print(WiFi.localIP());
}//上传图片
void take_send_photo() {Serial.println("Taking picture...");camera_fb_t* fb = NULL;fb = esp_camera_fb_get();if (!fb) {Serial.println("Camera capture failed");return;}if (client.beginPublish(DETAIL_TOPIC, fb->len + sizeof(long), false)) {unsigned long m = millis();int noBytes;noBytes = client.write(fb->buf, fb->len);noBytes = client.write((byte*)&m, sizeof(long));if (!client.endPublish()) {Serial.println("\nupload image error.");}}esp_camera_fb_return(fb);Serial.println("upload image ok.");
}void loop() {//检测到有人后 拍照并上传if (digitalRead(FOUND_PEOPLE_PIN) == 1) {take_send_photo();found_count += 1;delay(2000);} else {found_count = 0;}if (found_count >= 3) {found_count = 0;client.publish(APPEAR_TOPIC, "", 0);}client.loop();
}

注意事项：

1，接收图片的邮箱，需要开通smtp服务。

2，mqtt发送图片，不需要转成base64格式，但是需要重新设置下缓存大小。

3，这个玩意 发热很严重，还没测试 两节18650电池能用多久。