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巴法云物联网吃药提醒系统-第一课教案(配套4月3号视频)

  • 2026-05-15 13:06:32
巴法云物联网吃药提醒系统-第一课教案(配套4月3号视频)

系统架构

硬件连接图

老人端

子女办公室端

巴法云配置步骤

  1. 注册巴法云
     注册账号
  2. 创建主题
    :在"TCP/MQTT设备"中创建主题,如 medication001
  3. 获取连接信息
    • 服务器:bemfa.com
    • 端口:9501(TCP)或 9501(WebSocket)
    • 主题:medication001
  1. 无需密码
    :巴法云使用主题名作为鉴权,确保两端主题名完全一致

消息协议说明

消息类型

格式示例

发送

方向

含义

ALERT

ALERT|1|08:00|未按时吃药

老人→子女

超时未吃药告警

CONFIRM

CONFIRM|1|08:05|已吃药

老人→子女

老人按键确认已吃

RESOLVED

RESOLVED|1|08:05|告警解除

老人→子女

告警后确认,解除紧急状态

这个系统实现了完整的双向通信,确保子女能及时获知老人的吃药状态,并在异常情况下快速响应

课程信息

  • 课时
    :2课时(180分钟)
  • 授课对象
    :电子信息技术专业学生
  • 前置知识
    :Esp32基础、C语言语法、基础电路知识
  • 分组
    :每组2人(A角色-老人端,B角色-子女端)

【第一课时】老人端开发(90分钟)

教学目标

  1. 掌握ESP32-S3与WS2812灯条、按键的硬件连接
  2. 理解NTP网络时间同步原理
  3. 实现定时提醒、按键确认、超时告警功能
  4. 掌握巴法云MQTT基础通信

教学准备

物品

数量

备注

ESP32-S3开发板

1块/组

WS2812灯条(10灯)

1条/组

按键模块

1个/组

杜邦线

若干

电脑+Arduino IDE

1台/组

预装库:WiFi, NTPClient, Adafruit_NeoPixel, PubSubClient


【环节1】硬件连接与基础测试(20分钟)

教师讲解:今天我们要做一个关爱老人的智能物联网项目。老人端需要三个功能:按时提醒吃药、按键确认、超时通知子女。

边写边测步骤1:硬件连接

/* * 步骤1:硬件引脚定义 * 接线说明: *   按键模块:VCC→3.3V, GND→GND, S→GPIO2 *   WS2812灯条:VCC→5V, GND→GND, DIN→GPIO4 *  * 注意:ESP32-S3的GPIO4支持PWM,适合驱动WS2812 */#define BUTTON_PIN  2   // 按键接GPIO2#define LED_PIN     4   // 灯条数据接GPIO4#define NUM_LEDS   10   // 10颗LED// 引入驱动库(教师演示:项目→加载库→管理库→搜索"Adafruit NeoPixel"安装)#include <Adafruit_NeoPixel.h>// 创建灯条对象(教师讲解:NEO_GRB是颜色顺序,NEO_KHZ800是通信频率)Adafruit_NeoPixel strip(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

测试代码1:灯条自检

void setup() {  Serial.begin(115200);  // 初始化灯条  strip.begin();  strip.setBrightness(255);  // 亮度最大  // 测试:逐个点亮红色  Serial.println("灯条测试:逐个点亮");  for(int i=0; i<NUM_LEDS; i++) {    strip.clear();  // 清空    strip.setPixelColor(i, strip.Color(255, 0, 0));  // 第i个亮红灯    strip.show();   // 显示    delay(200);     // 延时200毫秒    Serial.print("点亮LED "); Serial.println(i);  }  // 全部绿色表示完成  for(int i=0; i<NUM_LEDS; i++) {    strip.setPixelColor(i, strip.Color(0, 255, 0));  }  strip.show();  Serial.println("硬件测试完成!");}void loop() {}

学生操作:连接硬件,上传测试代码,观察灯条是否逐个点亮。


【环节2】WiFi连接与时间同步(20分钟)

教师讲解:提醒器需要准确时间,我们通过WiFi获取网络时间(NTP)。

边写边测步骤2:WiFi+NTP

// 在步骤1代码基础上添加#include <WiFi.h>#include <NTPClient.h>      // 需安装:项目→加载库→管理库→搜索"NTPClient"#include <WiFiUdp.h>// ========== 网络配置 ==========// 教师提醒:修改为自己手机热点或教室WiFiconst char* ssid     = "你的WiFi名称";     // <-- 学生修改这里const char* password = "你的WiFi密码";      // <-- 学生修改这里// NTP配置(教师讲解:ntp.aliyun.com是阿里云时间服务器,utcOffset=8*3600是东八区)const long utcOffset = 8 * 3600;          // 东八区,+8小时const char* ntp_server = "ntp.aliyun.com";// 创建UDP和NTP客户端(教师讲解:UDP是通信协议,NTPClient封装了时间获取)WiFiUDP ntpUDP;NTPClient timeClient(ntpUDP, ntp_server, utcOffset);void setup() {  Serial.begin(115200);  strip.begin();  strip.show();  // 初始化灯条(全灭)  // ===== WiFi连接 =====  Serial.print("连接WiFi: ");  Serial.println(ssid);  WiFi.begin(ssid, password);  // 等待连接,最多15秒  int attempts = 0;  while (WiFi.status() != WL_CONNECTED && attempts < 30) {    delay(500);    Serial.print(".");    attempts++;  }  if(WiFi.status() == WL_CONNECTED) {    Serial.println("\nWiFi连接成功!");    Serial.print("IP地址: ");    Serial.println(WiFi.localIP());    // WiFi成功:绿灯闪烁3次    for(int i=0; i<3; i++) {      setAllLEDs(strip.Color(0, 255, 0)); delay(300);      setAllLEDs(strip.Color(0, 0, 0));   delay(300);    }  } else {    Serial.println("\nWiFi连接失败,请检查密码!");    setAllLEDs(strip.Color(255, 0, 0));  // 红灯常亮表示故障    while(1) delay(1000);  // 停止  }  // ===== NTP时间同步 =====  timeClient.begin();  timeClient.forceUpdate();  // 强制立即同步  // 设置时区环境变量(关键!确保localtime正确)  setenv("TZ", "CST-8", 1);  tzset();  Serial.println("时间同步完成!");}// 辅助函数:设置所有LED颜色void setAllLEDs(uint32_t color) {  for(int i=0; i<NUM_LEDS; i++) strip.setPixelColor(i, color);  strip.show();}void loop() {  // 更新时间  timeClient.update();  // 获取时间(教师讲解:getHours等方法是时区感知的,已经+8小时)  int hour = timeClient.getHours();  int minute = timeClient.getMinutes();  int second = timeClient.getSeconds();  // 每秒打印一次(调试用)  static unsigned long lastPrint = 0;  if(millis() - lastPrint >= 1000) {    lastPrint = millis();    Serial.printf("当前时间: %02d:%02d:%02d (北京时间)\n", hour, minute, second);  }  delay(10);}

学生操作:修改WiFi信息,上传代码,打开串口监视器(115200波特率),观察时间是否正确显示。

常见错误排查

  • 时间显示不对:检查utcOffset = 8 * 3600是否正确
  • WiFi连不上:检查2.4G/5G频段,ESP32只支持2.4G

【环节3】定时提醒逻辑(25分钟)

教师讲解:设置两个吃药时间(如12:30和20:00),到达时间后红灯闪烁,按键确认后变绿灯。

边写边测步骤3:提醒逻辑

// 在步骤2代码基础上,添加在loop()之前// ========== 提醒时间配置 ==========// 教师讲解:数组存储多个提醒时间,可扩展const int reminderHours[] = {12, 20};   // 时:12点和20点const int reminderMins[]  = {30, 0};   // 分:30分和0分const int NUM_REMINDERS = sizeof(reminderHours) / sizeof(reminderHours[0]);// 状态变量(教师讲解:用数组管理多个提醒的状态)bool reminderActive[NUM_REMINDERS] = {false};   // 是否激活bool confirmed[NUM_REMINDERS]      = {false}; // 是否已确认int lastDay = -1;  // 用于检测日期切换// LED状态机enum LedState { LED_IDLE, LED_REMIND, LED_CONFIRM };LedState ledState = LED_IDLE;// 时间记录unsigned long reminderStartTime[NUM_REMINDERS] = {0};unsigned long lastBlinkTime = 0;bool ledOn = false;unsigned long confirmStartTime = 0;// 常量const unsigned long BLINK_INTERVAL = 500;     // 闪烁间隔500msconst unsigned long CONFIRM_DURATION = 2000;   // 确认显示2秒// 按键消抖变量unsigned long lastButtonPressTime = 0;bool lastButtonState = HIGH;const unsigned long DEBOUNCE_DELAY = 200;// 辅助函数:边沿检测按键(教师重点讲解:检测从高到低的跳变,避免抖动)bool isButtonPressed() {  bool currentState = digitalRead(BUTTON_PIN);  bool pressed = false;  // 检测下降沿(释放→按下)  if(lastButtonState == HIGH && currentState == LOW) {    if(millis() - lastButtonPressTime > DEBOUNCE_DELAY) {      lastButtonPressTime = millis();      pressed = true;    }  }  lastButtonState = currentState;  return pressed;}// 辅助函数:LED状态处理void handleLED() {  switch(ledState) {    case LED_REMIND:  // 提醒状态:红灯闪烁      if(millis() - lastBlinkTime >= BLINK_INTERVAL) {        lastBlinkTime = millis();        ledOn = !ledOn;        setAllLEDs(ledOn ? strip.Color(255, 0, 0) : strip.Color(0, 0, 0));      }      break;    case LED_CONFIRM:  // 确认状态:绿灯常亮2秒      if(millis() - confirmStartTime >= CONFIRM_DURATION) {        setAllLEDs(strip.Color(0, 0, 0));  // 熄灭        ledState = LED_IDLE;      }      break;    default:  // 空闲      break;  }}// 辅助函数:每日重置(教师讲解:每天0点重置状态,确保每日提醒)void resetDailyConfirm() {  for(int i=0; i<NUM_REMINDERS; i++) {    confirmed[i] = false;    reminderActive[i] = false;  }  ledState = LED_IDLE;  setAllLEDs(strip.Color(0, 0, 0));  Serial.println("=== 新的一天,状态重置 ===");}void loop() {  timeClient.update();  int hour = timeClient.getHours();  int minute = timeClient.getMinutes();  int currentMinutes = hour * 60 + minute;  // 转换为分钟数,方便比较  // 获取日期(用于日切换检测)  time_t t = timeClient.getEpochTime();  struct tm *ptm = localtime(&t);  int day = ptm ? ptm->tm_mday : -1;  // 日期切换检测  if(day != -1 && day != lastDay) {    if(lastDay != -1) resetDailyConfirm();  // 非首次启动才重置    lastDay = day;  }  // 检查是否到达提醒时间(教师讲解:当前时间>=设定时间,且未激活,且未确认)  for(int i=0; i<NUM_REMINDERS; i++) {    if(!confirmed[i] && !reminderActive[i]) {      int setMinutes = reminderHours[i] * 60 + reminderMins[i];      if(currentMinutes >= setMinutes) {        reminderActive[i] = true;        reminderStartTime[i] = millis();        ledState = LED_REMIND;        Serial.printf("\n>>> 【提醒%d】到时间 %02d:%02d 了!请吃药 <<<\n",                       i+1, reminderHours[i], reminderMins[i]);      }    }  }  // 按键处理(教师演示:按按键确认吃药)  if(isButtonPressed()) {    Serial.println("按键按下!");    // 查找当前激活的提醒    int activeIdx = -1;    for(int i=0; i<NUM_REMINDERS; i++) {      if(reminderActive[i] && !confirmed[i]) {        activeIdx = i;        break;      }    }    if(activeIdx != -1) {      // 确认吃药      confirmed[activeIdx] = true;      reminderActive[activeIdx] = false;      ledState = LED_CONFIRM;      confirmStartTime = millis();      setAllLEDs(strip.Color(0, 255, 0));  // 绿灯      Serial.printf("*** 提醒%d已确认吃药 ***\n", activeIdx+1);    } else {      Serial.println("(当前无激活提醒)");    }  }  handleLED();  // 状态打印(每秒一次)  static unsigned long lastPrint = 0;  if(millis() - lastPrint >= 1000) {    lastPrint = millis();    Serial.printf("[状态] %02d:%02d | ", hour, minute);    bool anyActive = false;    for(int i=0; i<NUM_REMINDERS; i++) {      if(reminderActive[i] && !confirmed[i]) {        anyActive = true;        unsigned long elapsed = (millis() - reminderStartTime[i]) / 1000;        Serial.printf("提醒%d激活(%ds) ", i+1, elapsed);      }    }    Serial.println(anyActive ? "" : "等待中");  }  delay(10);}

测试方法

  1. 修改提醒时间为当前时间+1分钟(如现在13:05,设为13:06)
  2. 上传代码,观察1分钟后是否红灯闪烁
  3. 按按键,观察是否变绿灯2秒后熄灭

【环节4】MQTT接入与超时告警(25分钟)

教师讲解:如果老人2分钟没按键,我们要通知子女。这需要MQTT物联网通信。

边写边测步骤4:巴法云MQTT

// 在步骤3代码基础上添加#include <PubSubClient.h>  // 需安装:搜索"PubSubClient"// ========== 巴法云配置 ==========// 教师讲解:登录bemfa.com获取私钥,主题可自定义const char* mqtt_server = "bemfa.com";const int mqtt_port = 9501;const char* mqtt_client_id = "你的巴法云私钥";  // <-- 学生修改:从控制台复制const char* mqtt_topic = "medication001";     // 主题名,与子女端一致// 创建MQTT客户端(教师讲解:基于WiFi连接)WiFiClient espClient;PubSubClient mqttClient(espClient);// 超时配置const unsigned long ALERT_DELAY = 2 * 60 * 1000;  // 2分钟=120000毫秒bool alertSent[NUM_REMINDERS] = {false};          // 是否已发送告警// MQTT连接函数(教师讲解:保持连接,断线自动重连)void reconnectMQTT() {  while(!mqttClient.connected()) {    Serial.print("连接巴法云...");    if(mqttClient.connect(mqtt_client_id)) {      Serial.println("已连接!");      mqttClient.subscribe(mqtt_topic);  // 订阅主题    } else {      Serial.print("失败,状态码=");      Serial.print(mqttClient.state());      Serial.println(",5秒后重试");      delay(5000);    }  }}// 发送MQTT消息void sendMQTTMessage(const char* msg) {  if(!mqttClient.connected()) reconnectMQTT();  mqttClient.publish(mqtt_topic, msg);  // 发布到主题  Serial.print("[MQTT发送] ");  Serial.println(msg);}// 修改setup(),在WiFi连接后添加:void setup() {  // ... 前面的代码 ...  // MQTT初始化  mqttClient.setServer(mqtt_server, mqtt_port);  reconnectMQTT();  Serial.println("系统就绪!");}// 在loop()中添加超时检测(放在按键处理之前)void loop() {  // 保持MQTT连接(关键!必须放在loop开头)  if(!mqttClient.connected()) reconnectMQTT();  mqttClient.loop();  // 处理MQTT消息  // ... 前面的时间获取代码 ...  // 检查超时并发送告警(教师重点讲解)  for(int i=0; i<NUM_REMINDERS; i++) {    if(reminderActive[i] && !confirmed[i] && !alertSent[i]) {      unsigned long elapsed = millis() - reminderStartTime[i];      if(elapsed >= ALERT_DELAY) {  // 超过2分钟        alertSent[i] = true;        // 构建消息:类型|提醒ID|时间|描述        char msg[50];        sprintf(msg, "ALERT|%d|%02d:%02d|超时未吃药",                 i+1, hour, minute);        sendMQTTMessage(msg);        Serial.println("\n****************************************");        Serial.printf("*** 警告:提醒%d超过2分钟未确认!***\n", i+1);        Serial.println("*** 已向子女端发送紧急告警 ***");        Serial.println("****************************************\n");      }    }  }  // 修改按键处理:确认后发送解除告警  if(isButtonPressed()) {    // ... 前面的查找代码 ...    if(activeIdx != -1) {      // ... 前面的确认代码 ...      // 发送确认消息      char msg[50];      sprintf(msg, "CONFIRM|%d|%02d:%02d|已吃药", activeIdx+1, hour, minute);      sendMQTTMessage(msg);      // 如果之前已告警,发送解除      if(alertSent[activeIdx]) {        sprintf(msg, "RESOLVED|%d|%02d:%02d|告警解除", activeIdx+1, hour, minute);        sendMQTTMessage(msg);        Serial.println("告警已解除");      }    }  }  // ... 后面的代码 ...}

测试方法

  1. 注册巴法云账号,获取私钥
  2. 修改mqtt_client_id为实际私钥
  3. 修改提醒时间为当前时间+1分钟
  4. 上传代码,等待提醒触发后不要按按键
  5. 观察2分钟后是否发送MQTT消息(可通过巴法云控制台查看)

第一课时作业

  1. 完成老人端代码调试
  2. 测试三种场景:正常确认、超时告警、日期切换
  3. 准备第二课时:子女端开发

本文标签:#少儿编程 #科创 #电子爱好者 #物联网 #arduino  #ESP32

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  1. CONNECT:[ UseTime:0.001161s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001863s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000766s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000658s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001281s ]
  6. SELECT * FROM `set` [ RunTime:0.000531s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001741s ]
  8. SELECT * FROM `article` WHERE `id` = 491965 LIMIT 1 [ RunTime:0.001388s ]
  9. UPDATE `article` SET `lasttime` = 1779295971 WHERE `id` = 491965 [ RunTime:0.006005s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000656s ]
  11. SELECT * FROM `article` WHERE `id` < 491965 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001259s ]
  12. SELECT * FROM `article` WHERE `id` > 491965 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001080s ]
  13. SELECT * FROM `article` WHERE `id` < 491965 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002042s ]
  14. SELECT * FROM `article` WHERE `id` < 491965 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002085s ]
  15. SELECT * FROM `article` WHERE `id` < 491965 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003834s ]
0.118178s