ESP32为什么WiFi连接在深度睡眠后导致“掉电检测器被触发”

Question

当从深度睡眠中唤醒后重新连接到WiFi时，抛出错误“已触发断电检测器”，导致部分重启ESP。然后再次完成设置阶段，但现在WiFi成功连接。

如何在深度睡眠后正确地重新建立WiFi连接？

    #include <WiFi.h>
    #include "esp_wifi.h"
    
    #define SSID    "myssid"
    #define PASS    "ssidpass"
    
    #define uS_TO_S_FACTOR 1000000ULL   /* Conversion factor for micro seconds to seconds */
    #define TIME_TO_SLEEP  10           /* Time ESP32 will go to sleep (in seconds) */
    
    RTC_DATA_ATTR int boot_count = 0;
    
    void setup() {
      Serial.begin(115200);
      delay(200);
      
      print_wakeup_reason();
      Serial.print("Boot count: "); Serial.println(boot_count);
    
      Serial.println("WiFi connection");
      WiFi.begin(SSID, PASS);
      int try_count = 0;
      while (WiFi.status() != WL_CONNECTED && try_count < 10) {
          try_count++;
          delay(1000);
          Serial.println("Connection...");
      }
      Serial.println("WiFi connected");
    
      WiFi.disconnect();
      esp_wifi_stop();
      Serial.println("Sleeping in 1s ...");
      delay(1000);
    
      esp_deep_sleep(TIME_TO_SLEEP * uS_TO_S_FACTOR);  
    }
    
    void loop() {
    }
    
    void print_wakeup_reason(){
      esp_sleep_wakeup_cause_t wakeup_reason;
    
      wakeup_reason = esp_sleep_get_wakeup_cause();
    
      switch(wakeup_reason)
      {
        case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
        case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
        case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break;
        case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break;
        case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break;
        default : Serial.printf("Wakeup was not caused by deep sleep: %d\n",wakeup_reason); break;
      }
    }

相应的串行监视器消息：

ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5816
entry 0x400806ac
Wakeup was not caused by deep sleep: 0
Boot count: 0
WiFi connection
Connection...
WiFi connected
Sleeping in 1s ...
ets Jun  8 2016 00:22:57

rst:0x5 (DEEPSLEEP_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5816
entry 0x400806ac
Wakeup caused by timer
Boot count: 0
WiFi connection

Brownout detector was triggered

ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5816
entry 0x400806ac
Wakeup was not caused by deep sleep: 0
Boot count: 0
WiFi connection
Connection...
WiFi connected
Sleeping in 1s ...
ets Jun  8 2016 00:22:57

rst:0x5 (DEEPSLEEP_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5816
entry 0x400806ac
Wakeup caused by timer
Boot count: 0
WiFi connection

Brownout detector was triggered

我使用的是ESP-WROOM-32 (芯片是ESP32D0WDQ6 (版本1))，在GNU Linux上，使用Arduino IDE 1.8.13，卡片库: Espressif System 1.0.4

Answer 1

这是一个电源问题。您需要一个功能更强大的电源来为ESP32供电。如果使用USB供电的开发板，请尝试更换USB电缆并将其直接连接到计算机上的USB端口。供电的USB集线器也可能会有所帮助。