ESP32 Deep Sleep and Wake-up

Purpose:

利用電池整合的ESP32產品, 因為 WiFi 跟 Bluetooth都在動作, 所以電池電量很快就耗盡. 所以就決定試看看用深度睡眠模式(Deep Sleep mode)的方式來減少運行的功耗, 再利用GPIO外部喚醒方式來運作. 

Using the ESP32 product integrated with the battery, because the WiFi and Bluetooth are both active, the battery power will be exhausted soon. So I decided to try to use the Deep Sleep mode to reduce the power consumption of the operation, and then use the GPIO External wake-up mode to operate.

ESP32有基本的sample範例

 esp_sleep_wakeup_cause_t wakeup_reason;

 wakeup_reason = esp_sleep_get_wakeup_cause();

 esp_sleep_enable_ext0_wakeup(GPIO_NUM_33,1); //1 = High, 0 = Low

注意只有橘色RTC_GPIO可以當作外部觸發的腳位, 因為Deep_sleep_mode 只有RTC memory跟RTC周邊還在工作

Fundamental:

ESP32 Deep Sleep Mode

In this mode, only two of the seven main ESP32 parts remain active and the rest are deactivated. These two parts are:

1 Ultra Low Power Coprocessor (ULP Coprocessor) 

2 timer (RTC)

Power consumption compare table

The table below details the power modes

Circuit:

Code Introduce:

//--------- Flag structure --------------------------------------

typedef struct _vFlag

{

  uint8_t BTFlag = 0;

  uint8_t CANFlag = 0;

  uint8_t I2C_Flag = 0;

  uint8_t BMP180Flag = 0;

  uint8_t LEDFlag = 1;

  uint8_t sensor_Flag = 0;

  uint8_t initial_Flag = 0;

  uint8_t FunctionFlag = 3;

  uint8_t SendFlag = 0;

  uint8_t LEDCnt = 0;

  uint8_t Wakeup = 0;

} vFlag;

vFlag *flag_Ptr;

vFlag flag;

//----------uart--------------

#define LINE_BUFFER_LENGTH 64

//--------- uart structure --------------------------------------

typedef struct _vUart

{

  char c;

  int lineIndex = 0;

  int line1Index = 0;

  int BTlineIndex = 0;

  bool lineIsComment;

  bool lineSemiColon;

  //char *line;

  char line[128];

  //char line1[128];

  char BTline[20];

  //char R_line[20];

  //char L_line[20];

  String inputString;

  String BTinputString;

  String S1inputString;

  int V[16];

  char ctemp[30];

  char I2C_Data[80];

  int DC_Spped = 50;

  float Voltage[16];

  int Buffer[128];

  int StartCnt = 0;

  int ReadCnt = 0;

  int sensorValue = 0;

} vUart;

vUart *Uart_Ptr;

vUart Uart;

//---------------------------------------------------

#define LED_BUILTIN 2

//#define WAKE_UP_PIN 33

int buttonpin = 33;

//-------------------------------------------------

void setup()

{

  Serial.begin(9600);

  Serial.println(F("init"));

  pinMode(LED_BUILTIN, OUTPUT);

  //pinMode(buttonBpin, INPUT_PULLDOWN);

  esp_sleep_wakeup_cause_t wakeup_reason;

  wakeup_reason = esp_sleep_get_wakeup_cause();

  esp_sleep_enable_ext0_wakeup(GPIO_NUM_33,1); //1 = High, 0 = Low

  //Serial.println("esp_deep_sleep_start");

  //esp_deep_sleep_start();

}

//-----------------------------------------

void loop()

{

 

  Serial.print(F("Main at core:"));

  Serial.println(xPortGetCoreID());

  while(1)

  {

    if (digitalRead(buttonpin) == HIGH)

    {

      flag.LEDCnt=0;

      Serial.println("esp_wake_up");

      Serial.println("LED flash");

    }

    //---------------------------------------------

    if(flag.LEDFlag == 1)

    {

      digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)

      vTaskDelay(300);

      digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW

      vTaskDelay(300);

      if(flag.LEDCnt !=20)

      {

        flag.LEDCnt++;

        Serial.print(flag.LEDCnt);

        Serial.print("--");

        Serial.println("esp_no_sleep");

      }

      else

      {

        Serial.println("esp_deep_sleep_start");

        esp_deep_sleep_start();

      }

     

    }

    while (Serial.available() > 0)

    {

      Uart.c = Serial.read();

      if ((Uart.c == '\n') || (Uart.c == '\r'))

      { // End of line reached

        if (Uart.lineIndex > 0)

        { // Line is complete. Then execute!

          Uart.line[Uart.lineIndex] = '\0'; // Terminate string

          //Serial.println( F("Debug") );

          //Serial.println( Uart.inputString );

          processCommand(Uart.line); // do something with the command

          //傳輸給藍芽

         

          Uart.lineIndex = 0;

          Uart.inputString = "";

        }

        else

        {

          // Empty or comment line. Skip block.

        }

        Uart.lineIsComment = false;

        Uart.lineSemiColon = false;

        Serial.println(F("ok>"));

      }

      else

      {

        //Serial.println( c );

        if ((Uart.lineIsComment) || (Uart.lineSemiColon))

        {

          if (Uart.c == ')')

            Uart.lineIsComment = false; // End of comment. Resume line.

        }

        else

        {

          if (Uart.c == '/')

          { // Block delete not supported. Ignore character.

          }

          else if (Uart.c == '~')

          { // Enable comments flag and ignore all characters until ')' or EOL.

            Uart.lineIsComment = true;

          }

          else if (Uart.c == ';')

          {

            Uart.lineSemiColon = true;

          }

          else if (Uart.lineIndex >= LINE_BUFFER_LENGTH - 1)

          {

            Serial.println("ERROR - lineBuffer overflow");

            Uart.lineIsComment = false;

            Uart.lineSemiColon = false;

          }

          else if (Uart.c >= 'a' && Uart.c <= 'z')

          { // Upcase lowercase

            Uart.line[Uart.lineIndex] = Uart.c - 'a' + 'A';

            Uart.lineIndex = Uart.lineIndex + 1;

            Uart.inputString += (char)(Uart.c - 'a' + 'A');

          }

          else

          {

            Uart.line[Uart.lineIndex] = Uart.c;

            Uart.lineIndex = Uart.lineIndex + 1;

            Uart.inputString += Uart.c;

          }

        }

      }

    } //while (Serial.available() > 0)

  }

}

//----------------------------------------

void processCommand(char *data)

{

  int len, xlen, ylen, zlen, alen;

  int tempDIO;

  String stemp;

  len = Uart.inputString.length();

  //---------------------------------------

  if (strstr(data, "VER") != NULL)

  {

    Serial.println(F("ESP32_20230726"));

  }

}

//-----------------------------------------

YouTube Demonstration: