NodeMCU上传HC-SR04+SinricPro代码后出现WDT复位问题求助

问题现象 #

将合并后的代码上传至NodeMCU后，串口监视器输出看门狗复位日志及乱码：

14:55:28.265 -> 
14:55:36.662 -> 
14:55:36.662 ->  ets Jan  8 2013,rst cause:4, boot mode:(3,6)
14:55:36.662 -> 
14:55:36.662 -> wdt reset
14:55:36.662 -> load 0x4010f000, len 3424, room 16 
14:55:36.662 -> tail 0
14:55:36.662 -> chksum 0x2e
14:55:36.662 -> load 0x3fff20b8, len 40, room 8 
14:55:36.662 -> tail 0
14:55:36.662 -> chksum 0x2b
14:55:36.662 -> csum 0x2b
14:55:36.662 -> v00065ae0
14:55:36.662 -> ~ld
14:55:36.727 -> ����n��r��n|�$�$`#��|r�l�o��N�l`��r�d����

问题定位 #

1. 看门狗(WDT)复位：handleMotionsensor()中的delay(500)和无超时的pulseIn()是阻塞函数，会导致ESP8266主循环长时间无法执行，触发看门狗强制复位。
2. 引脚配置错误：NodeMCU需使用GPIO编号而非板上丝印数字，原代码中trigPin=6、echoPin=5对应错误硬件引脚，导致HC-SR04无法正常工作。
3. 逻辑错误：actualMotionState始终被初始化为false，即使检测到距离小于13cm也未更新，导致SinricPro事件永远无法触发。
4. 串口乱码：看门狗复位后的硬件状态异常+波特率同步问题导致输出乱码，修复阻塞问题后可自动解决。

修复后的代码 #

#ifdef ENABLE_DEBUG
  #define DEBUG_ESP_PORT Serial
  #define NODEBUG_WEBSOCKETS
  #define NDEBUG
#endif

#include <Arduino.h>
#if defined(ESP8266)
  #include <ESP8266WiFi.h>
#elif defined(ESP32) || defined(ARDUINO_ARCH_RP2040)
  #include <WiFi.h>
#endif

#include "src/SinricPro.h"
#include "src/SinricProMotionsensor.h"

// 填写你的WiFi和SinricPro信息
#define WIFI_SSID         "你的WiFi名称"    
#define WIFI_PASS         "你的WiFi密码"
#define APP_KEY           "你的SinricPro APP_KEY"      
#define APP_SECRET        "你的SinricPro APP_SECRET"   
#define MOTIONSENSOR_ID   "你的运动传感器设备ID"    
#define BAUD_RATE         115200               

// NodeMCU正确GPIO引脚（D6=GPIO12，D5=GPIO14）
#define trigPin 12                      
#define echoPin 14                       

bool lastMotionState = false;
unsigned long lastDetectionTime = 0;
const unsigned long DETECT_INTERVAL = 500; // 500ms检测一次
const unsigned long PULSE_TIMEOUT = 20000; // 20ms超时，对应最大检测距离~3.4m

void handleMotionsensor() {
  unsigned long currentMillis = millis();
  // 非阻塞式检测间隔控制
  if (currentMillis - lastDetectionTime < DETECT_INTERVAL) return;
  lastDetectionTime = currentMillis;

  long duration;
  int distance;            

  // HC-SR04标准触发时序
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // 添加超时的pulseIn，避免无限阻塞
  duration = pulseIn(echoPin, HIGH, PULSE_TIMEOUT);
  if (duration == 0) {
    distance = 999; // 超时标记为远距离
  } else {
    distance = (duration / 2) / 29.1;
  }

  // 正确更新运动状态
  bool actualMotionState = (distance < 13);

  Serial.print("Distance: ");             
  Serial.print(distance);             
  Serial.println(" CM");

  // 状态变化时触发SinricPro事件
  if (actualMotionState != lastMotionState) {         
    Serial.printf("Motion %s\n", actualMotionState?"detected":"not detected");
    lastMotionState = actualMotionState;              

    SinricProMotionsensor &myMotionsensor = SinricPro[MOTIONSENSOR_ID];
    bool success = myMotionsensor.sendMotionEvent(actualMotionState);
    if(!success) {
      Serial.printf("Failed to send motion event to SinricPro!\n");
    }
  }
}

void setupWiFi() {
  Serial.printf("\r\n[Wifi]: Connecting");

  #if defined(ESP8266)
    WiFi.setSleepMode(WIFI_NONE_SLEEP); 
    WiFi.setAutoReconnect(true);
  #elif defined(ESP32)
    WiFi.setSleep(false); 
    WiFi.setAutoReconnect(true);
  #endif
  
  WiFi.begin(WIFI_SSID, WIFI_PASS);

  while (WiFi.status() != WL_CONNECTED) {
    Serial.printf(".");
    delay(500); // 短延迟不影响看门狗
  }
  IPAddress localIP = WiFi.localIP();
  Serial.printf("connected!\r\n[WiFi]: IP-Address is %d.%d.%d.%d\r\n", localIP[0], localIP[1], localIP[2], localIP[3]);
}

void setupSinricPro() {
  SinricProMotionsensor& myMotionsensor = SinricPro[MOTIONSENSOR_ID];
  SinricPro.onConnected([](){ Serial.printf("Connected to SinricPro\r\n"); });
  SinricPro.onDisconnected([](){ Serial.printf("Disconnected from SinricPro\r\n"); });
  SinricPro.begin(APP_KEY, APP_SECRET);
}

void setup() {
  Serial.begin(BAUD_RATE); 
  Serial.printf("\r\n\r\n");

  pinMode(trigPin, OUTPUT);           
  pinMode(echoPin, INPUT);

  setupWiFi();
  setupSinricPro();
}

void loop() {
  handleMotionsensor();
  SinricPro.handle();
}

修复说明 #

• 引脚修正：将trigPin和echoPin改为NodeMCU对应的GPIO编号，确保硬件连接正确。
• 非阻塞逻辑：用millis()替代delay()控制检测间隔，给pulseIn()添加超时时间，避免主循环阻塞触发看门狗复位。
• 逻辑修复：正确根据距离值设置actualMotionState，确保状态变化时能触发SinricPro事件。
• 时序优化：调整HC-SR04的触发时序为标准10us脉冲，提升检测稳定性。

内容的提问来源于stack exchange，提问作者Jayman