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巴法云物联网吃药提醒系统-第二课教案(配套4月3号视频)

  • 2026-05-15 00:52:00
巴法云物联网吃药提醒系统-第二课教案(配套4月3号视频)

教学目标

  1. 掌握第二块ESP32的MQTT订阅通信
  2. 实现状态指示灯系统(空闲/告警/确认/解除)
  3. 理解双向通信的协议设计
  4. 完成系统联调测试

【环节1】硬件连接与基础框架(15分钟)

教师讲解:子女端更简单,只需要一个环形LED灯,通过颜色显示老人状态。

边写边测步骤1:基础框架

/* * 吃药提醒器 - 子女办公室端 * 硬件:ESP32-S3 + WS2812环形LED灯(GPIO4) *  * 状态说明: *   微弱蓝光 = 空闲(系统正常) *   红灯闪烁 = 告警(老人未按时吃药,频率随时间加快) *   绿灯常亮 = 确认(老人已吃药) *   蓝灯闪烁 = 解除(告警已解除) */#include <WiFi.h>#include <Adafruit_NeoPixel.h>#include <PubSubClient.h>// ========== 硬件配置 ==========#define LED_PIN   4       // 环形灯数据脚#define NUM_LEDS  16      // 16颗灯(根据实际修改12/16/24)// ========== 网络配置(办公室WiFi) ==========const char* ssid     = "办公室WiFi";      // <-- 学生修改const char* password = "办公室密码";        // <-- 学生修改// ========== 巴法云配置(必须与老人端一致!) ==========const char* mqtt_server = "bemfa.com";const int mqtt_port = 9501;// 关键:Client ID必须与老人端不同!但主题是相同的const char* mqtt_client_id = "你的巴法云私钥-office";  // <-- 修改:加后缀区分const char* mqtt_topic = "medication001";           // 与老人端相同// 创建对象WiFiClient espClient;PubSubClient mqttClient(espClient);Adafruit_NeoPixel ring(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);// LED辅助函数void setRingColor(uint32_t color) {  for(int i=0; i<NUM_LEDS; i++) ring.setPixelColor(i, color);  ring.show();}void setRingOff() { setRingColor(ring.Color(0, 0, 0)); }void setup() {  Serial.begin(115200);  delay(1000);  Serial.println("=== 子女办公室端启动 ===");  // 初始化LED  ring.begin();  ring.setBrightness(255);  setRingOff();  // 自检动画:彩虹效果  Serial.println("LED自检...");  for(int j=0; j<256; j+=5) {    for(int i=0; i<NUM_LEDS; i++) {      int hue = (i * 256 / NUM_LEDS) + j;      ring.setPixelColor(i, ring.gamma32(ring.ColorHSV(hue)));    }    ring.show();    delay(20);  }  setRingOff();  // WiFi连接(同老人端,略)  WiFi.begin(ssid, password);  Serial.print("连接WiFi");  while(WiFi.status() != WL_CONNECTED) {    delay(500); Serial.print(".");  }  Serial.println(" 成功");  // MQTT设置  mqttClient.setServer(mqtt_server, mqtt_port);  // 注意:子女端需要设置回调函数接收消息  mqttClient.setCallback(mqttCallback);  Serial.println("系统就绪");}void loop() {  // 保持连接  if(!mqttClient.connected()) reconnectMQTT();  mqttClient.loop();  delay(10);}// 占位函数(后续填充)void mqttCallback(char* topic, byte* payload, unsigned int length) {}void reconnectMQTT() {}

学生操作:连接环形灯(VCC→5V, GND→GND, DIN→GPIO4),上传测试彩虹效果。


【环节2】MQTT消息接收与解析(25分钟)

教师讲解:子女端是"订阅者",需要解析老人端发来的三种消息:ALERT(告警)、CONFIRM(确认)、RESOLVED(解除)。

边写边测步骤2:消息解析

// 在步骤1代码基础上添加状态机和消息解析// ========== 状态定义 ==========enum OfficeState {  STATE_IDLE,       // 空闲:微弱蓝光  STATE_ALERT,      // 告警:红灯闪烁(频率递增)  STATE_CONFIRMED,    // 确认:绿灯常亮3秒  STATE_RESOLVED     // 解除:蓝灯闪烁3秒};OfficeState currentState = STATE_IDLE;unsigned long stateStartTime = 0;    // 状态开始时间unsigned long lastBlinkTime = 0;     // 闪烁计时bool ledOn = false;              // 闪烁状态int currentAlertId = -1;          // 当前告警ID// 告警效果配置const unsigned long BASE_BLINK_INTERVAL = 1000;  // 基础闪烁1秒const unsigned long MIN_BLINK_INTERVAL = 200;    // 最快闪烁200msconst unsigned long ALERT_ESCALATION_TIME = 5*60*1000; // 5分钟后最快const unsigned long CONFIRM_DURATION = 3000;     // 确认显示3秒// MQTT连接(教师讲解:与老人端类似,但不需要订阅自己发布的主题)void reconnectMQTT() {  while(!mqttClient.connected()) {    Serial.print("连接巴法云...");    // 生成唯一Client ID(避免冲突)    String clientId = String(mqtt_client_id) + "-" + String(random(0xffff), HEX);    if(mqttClient.connect(clientId.c_str())) {      Serial.println("成功!");      mqttClient.subscribe(mqtt_topic);  // 订阅老人端发布的主题      Serial.print("已订阅主题: ");      Serial.println(mqtt_topic);    } else {      Serial.print("失败,rc=");      Serial.println(mqttClient.state());      delay(5000);    }  }}// MQTT回调函数(核心!处理收到的消息)void mqttCallback(char* topic, byte* payload, unsigned int length) {  // 将payload转换为字符串  String msg = "";  for(int i=0; i<length; i++) msg += (char)payload[i];  Serial.print("\n[MQTT接收] ");  Serial.println(msg);  // 解析消息格式:TYPE|ID|TIME|DESC  // 例如:ALERT|1|12:30|超时未吃药  parseMessage(msg);}// 消息解析函数(教师重点讲解字符串分割)void parseMessage(String msg) {  // 找分隔符位置  int firstSep = msg.indexOf('|');           // 第一个|  int secondSep = msg.indexOf('|', firstSep+1);  // 第二个|  int thirdSep = msg.indexOf('|', secondSep+1);  // 第三个|  if(firstSep == -1) {    Serial.println("消息格式错误");    return;  }  // 提取字段  String msgType = msg.substring(0, firstSep);                    // ALERT/CONFIRM/RESOLVED  String idStr = msg.substring(firstSep+1, secondSep);            // 提醒ID  String timeStr = msg.substring(secondSep+1, thirdSep);          // 时间  String desc = msg.substring(thirdSep+1);                        // 描述  int alertId = idStr.toInt();  Serial.printf("解析: 类型=%s, ID=%d, 时间=%s, 描述=%s\n",                 msgType.c_str(), alertId, timeStr.c_str(), desc.c_str());  // 根据类型切换状态  if(msgType == "ALERT") {    currentState = STATE_ALERT;    currentAlertId = alertId;    stateStartTime = millis();    lastBlinkTime = millis();    ledOn = false;    // 串口打印告警框(吸引注意力)    Serial.println("\n╔══════════════════════════════════════╗");    Serial.println("║     ⚠️  紧急告警:老人未按时吃药!    ║");    Serial.printf("║     提醒编号: %d  时间: %s          ║\n", alertId, timeStr.c_str());    Serial.println("║     请立即电话联系老人确认情况       ║");    Serial.println("╚══════════════════════════════════════╝\n");  } else if(msgType == "CONFIRM") {    currentState = STATE_CONFIRMED;    stateStartTime = millis();    Serial.println("\n╔══════════════════════════════════════╗");    Serial.println("║     ✅ 老人已确认吃药               ║");    Serial.printf("║     提醒编号: %d  时间: %s          ║\n", alertId, timeStr.c_str());    Serial.println("╚══════════════════════════════════════╝\n");  } else if(msgType == "RESOLVED") {    currentState = STATE_RESOLVED;    stateStartTime = millis();    Serial.println("\n╔══════════════════════════════════════╗");    Serial.println("║     ✓ 告警解除:状况已恢复正常      ║");    Serial.println("╚══════════════════════════════════════╝\n");  }}// 在loop()中添加状态处理void loop() {  if(!mqttClient.connected()) reconnectMQTT();  mqttClient.loop();  handleState();  // 处理LED状态  delay(10);}

测试方法

  1. 上传代码到子女端
  2. 打开巴法云控制台,手动发送测试消息到medication001主题:
    • 发送ALERT|1|12:30|测试告警,观察是否红灯闪烁
    • 发送CONFIRM|1|12:32|已吃药,观察是否绿灯
    • 发送RESOLVED|1|12:32|解除,观察是否蓝灯闪烁

【环节3】告警效果优化(20分钟)

教师讲解:告警需要紧迫感,我们让红灯闪烁越来越快,亮度也越来越高。

边写边测步骤3:动态效果

// 计算当前闪烁间隔(教师讲解:线性插值算法)unsigned long getCurrentBlinkInterval() {  if(currentState != STATE_ALERT) return BASE_BLINK_INTERVAL;  unsigned long alertDuration = millis() - stateStartTime;  // 超过5分钟后,保持最快频率  if(alertDuration >= ALERT_ESCALATION_TIME) {    return MIN_BLINK_INTERVAL;  }  // 线性加速:随着时间推移,间隔从1000ms降到200ms  float progress = (float)alertDuration / ALERT_ESCALATION_TIME;  unsigned long interval = BASE_BLINK_INTERVAL -     (unsigned long)((BASE_BLINK_INTERVAL - MIN_BLINK_INTERVAL) * progress);  return interval;}// 状态处理函数(教师边写边解释每个状态的效果)void handleState() {  unsigned long now = millis();  switch(currentState) {    case STATE_IDLE:      // 空闲:微弱蓝光(表示系统在线)      setRingColor(ring.Color(0, 0, 10));      break;    case STATE_ALERT: {      // 告警:红灯闪烁,频率和亮度都递增      unsigned long interval = getCurrentBlinkInterval();      if(now - lastBlinkTime >= interval) {        lastBlinkTime = now;        ledOn = !ledOn;        if(ledOn) {          // 亮度也随时间增加:100-255          unsigned long duration = now - stateStartTime;          int brightness = 100 + min((int)(duration/1000), 155);          setRingColor(ring.Color(brightness, 0, 0));          // 每10秒串口提示一次          static unsigned long lastPrint = 0;          if(now - lastPrint >= 10000) {            lastPrint = now;            Serial.printf("[告警中] 持续%ld秒,闪烁间隔%ldms\n",                          duration/1000, interval);          }        } else {          setRingOff();        }      }      break;    }    case STATE_CONFIRMED:      // 确认:绿色常亮3秒后恢复空闲      setRingColor(ring.Color(0, 255, 0));      if(now - stateStartTime >= CONFIRM_DURATION) {        currentState = STATE_IDLE;        Serial.println("确认状态结束,恢复空闲");      }      break;    case STATE_RESOLVED:      // 解除:蓝色闪烁后恢复      if(now - lastBlinkTime >= 200) {        lastBlinkTime = now;        ledOn = !ledOn;        setRingColor(ledOn ? ring.Color(0, 100, 255) : ring.Color(0, 0, 0));      }      if(now - stateStartTime >= CONFIRM_DURATION) {        currentState = STATE_IDLE;        Serial.println("解除状态结束,恢复空闲");      }      break;  }}

测试方法

  1. 发送ALERT消息后,观察红灯是否逐渐加快闪烁
  2. 用手机计时,确认5分钟后达到最快频率(200ms间隔)

【环节4】系统联调与总结(30分钟)

教师组织:两组配对,A组老人端,B组子女端,进行联调测试。

测试场景

场景

操作

预期结果

场景1:正常吃药

老人端提醒→立即按键

老人端绿灯2秒;子女端无告警

场景2:超时告警

老人端提醒→等待2分钟不按

老人端发送ALERT;子女端红灯闪烁

场景3:远程确认

在场景2后,老人按键

老人端绿灯;子女端收到CONFIRM变绿灯

场景4:日期切换

等待0点或手动改系统时间

两端都重置状态,准备次日提醒

完整代码(两端的最终版)

已在附件中提供,包含详细注释。


教学评价标准

评价维度

优秀(90-100)

良好(75-89)

合格(60-74)

功能实现

四场景全部通过

通过3个场景

通过2个场景

代码规范

注释清晰,命名规范

有基本注释

能运行但注释少

硬件连接

整洁,无松动

基本正确

需教师协助

团队协作

主动配对测试

能配合测试

独立完成

创新拓展

增加功能(如语音、多老人)

有改进想法

按教案完成

拓展思考(课后作业)

  1. 安全性
    如何防止他人恶意向你的主题发送消息?(提示:消息加密)
  2. 扩展性
    如何支持多个老人?(提示:主题命名规则medication/老人ID
  3. 低功耗
    老人端如何用电池供电?(提示:ESP32 Deep Sleep模式)
  4. 多子女
    :如何通知多个子女?(提示:多个设备订阅同一主题)

教师备课要点

  1. 课前准备:
    • 测试教室WiFi是否允许MQTT端口9501
    • 准备备用手机热点(防止公司网络限制)
    • 准备演示用的巴法云账号
  1. 常见故障:
    • 状态码-2:检查WiFi密码
    • 状态码5:Client ID重复,加随机后缀
    • 时间不对:检查时区设置CST-8
    • 灯条不亮:检查GPIO4是否接触不良
  1. 时间控制:
    • 如课时不够,可省略"日期切换"功能
    • 如课时充裕,可增加OLED显示屏显示时间

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:0.000497s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000832s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000344s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000445s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000790s ]
  6. SELECT * FROM `set` [ RunTime:0.000315s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000832s ]
  8. SELECT * FROM `article` WHERE `id` = 492207 LIMIT 1 [ RunTime:0.000560s ]
  9. UPDATE `article` SET `lasttime` = 1779275936 WHERE `id` = 492207 [ RunTime:0.000761s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000330s ]
  11. SELECT * FROM `article` WHERE `id` < 492207 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000577s ]
  12. SELECT * FROM `article` WHERE `id` > 492207 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000464s ]
  13. SELECT * FROM `article` WHERE `id` < 492207 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000971s ]
  14. SELECT * FROM `article` WHERE `id` < 492207 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000872s ]
  15. SELECT * FROM `article` WHERE `id` < 492207 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000928s ]
0.116134s