20元制作NodeMCU+超声波模块+Python开门检测神器

目录

 

前言

效果图

硬软件条件：

单片机程序

服务器端代码 

结束

---

前言

最近出来实习，一个人住出租屋每天晚上回来总感觉屋子里面有人来过，因此像制作一个开门预警通知的小工具。

效果图

 

 

原理也很简单：单片机检测与门的距离，距离小于设定值且持续一段时间（2s），发邮件给我预警。

 

 

硬软件条件

• 1.NodeMCU+超声波
• 2.云端服务器（不用也可以，本地部署也可以的，但是必须NodeMCU与部署的电脑同局域网，知道内网穿透的同学当我没说）
• 3.Arduino IDE
• 4.Python+flask发邮件

单片机程序

#include 
#include 

#ifndef STASSID
#define STASSID "WiFi_SSID"
#define STAPSK  "WiFi_PASSWD"
#endif

const char* ssid = STASSID;
const char* password = STAPSK;

const char* host = "your.sendMail.host";
const int httpsPort = 5000;

// Use web browser to view and copy
// SHA1 fingerprint of the certificate
const char fingerprint[] PROGMEM = "5F F1 60 31 09 04 3E F2 90 D2 B0 8A 50 38 04 E8 37 9F BC 76";
// 定义引脚编号
const int trigPin = 2;  //D4
const int echoPin = 0;  //D3

// 定义变量
long duration;
int distance;
void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT); // 将trigPin设置为输出
  pinMode(echoPin, INPUT); // 将echoPin设置为输入
  
  Serial.println();
  Serial.print("connecting to ");
  Serial.println(ssid);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
void alarm(String info){
  // Use WiFiClientSecure class to create TLS connection
  WiFiClient client;
  Serial.print("connecting to ");
  Serial.println(host);
  // http 访问此链接，发送邮件
  String url = "/send_email?info="+info;
  Serial.print("requesting URL: ");
  Serial.println(url);
//  Serial.printf("Using fingerprint '%s'\n", fingerprint);
//  client.setFingerprint(fingerprint);

  if (!client.connect(host, httpsPort)) {
    Serial.println("connection failed");
    return;
  }

  
  

  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "User-Agent: BuildFailureDetectorESP8266\r\n" +
               "Connection: close\r\n\r\n");

  Serial.println("request sent");
  while (client.connected()) {
    String line = client.readStringUntil('\n');
    if (line == "\r") {
      Serial.println("headers received");
      break;
    }
  }
  String line = client.readStringUntil('\n');
  if (line.startsWith("{\"state\":\"success\"")) {
    Serial.println("esp8266/Arduino CI successfull!");
  } else {
    Serial.println("esp8266/Arduino CI has failed");
  }
  Serial.println("reply was:");
  Serial.println("==========");
  Serial.println(line);
  Serial.println("==========");
  Serial.println("closing connection");
}
float getDistance(){
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  //将trigPin设置为HIGH状态10微秒
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // 读取echoPin，以微秒为单位返回声波传播时间
  duration = pulseIn(echoPin, HIGH);
  
  // 计算距离
  distance= duration*0.034/2;
  // 打印距离在串行监视器
  Serial.print("Distance: ");
  Serial.println(distance);
  return distance;
}
int num=0;
int sum_num=0;
void loop() {
  while(true){
      int d = getDistance();
      delay(200);
      if(d<50){
        num++;
        if(num>10){
          alarm(String(d));
          num=0;
        }
      }
      if(sum_num>100){
        sum_num=0;
        num=0;
      }
  }
}

 

服务器端代码 

# -*- coding: utf-8 -*-
from flask import Flask, request
from flask_script import Manager, Shell
from flask_mail import Mail, Message
from threading import Thread
import os
 
app = Flask(__name__)
app.config['MAIL_SERVER'] = 'smtp.qq.com'
app.config['MAIL_PORT'] = 587
app.config['MAIL_USE_TLS'] = True
app.config['MAIL_USERNAME'] = '[email protected]'
app.config['MAIL_PASSWORD'] = 'pwd'
mail = Mail(app)
 
msg = Message('⚠️警告⚠️', sender='[email protected]', recipients=['[email protected]'])
msg.body = '内容'
# with app.app_context():
#     mail.send(msg)
 
def send_async_email(app, msg):
    with app.app_context():
        mail.send(msg)
 
@app.route('/send_email')
def send_email():
    msg.html = '
Door is opened
Maybe somebody open the door, please confirm!
'
    thread = Thread(target=send_async_email, args=[app, msg])
    thread.start()
    return 'success'
if __name__ == '__main__':
    app.run(host="0.0.0.0",port=5000)

结束