Wokwi Simulator - Serial port and LED Application

Wokwi

Wokwi is an online Electronics simulator. You can use it to simulate Arduino, ESP32, STM32, and many other popular boards, parts and sensors.

This Project is show How to make ESP32 receive UART command and LED blink.

Supported Hardware

Wokwi simulates a wide variety of hardware components, including microcontrollers, sensors, displays, and more. It supports the following architectures: ARM, AVR, RISC-V, and Xtensa.

According to different development Board, Enter a different URL

for example https://wokwi.com/projects/new/esp32

https://wokwi.com/projects/new/arduino-mega

YouTubeDemo

code introduce

#include <BluetoothSerial.h>

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

typedef struct _vFlag

{

  uint8_t LEDFlag=1;

  uint8_t BTFlag = 0;

  uint8_t ServoFlag = 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[128];

  char BTline[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

BluetoothSerial SerialBT;

void setup()

{

  Serial.begin(115200);

  //SerialBT.begin("BT_Wokwi");   // no support

  pinMode(LED_BUILTIN, OUTPUT);

}

void loop()

{

  Serial.print(F("Main at core:"));

  Serial.println(xPortGetCoreID());

  while(1)

  {

    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);

    }

    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

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

          SerialBT.println(Uart.line);

         

          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)

    while (SerialBT.available())

    {

      String BTdata = SerialBT.readString();

      Serial.println(BTdata);

      BTprocessCommand(BTdata); // do something with the command

    }//while (BT.available())

  }

}//----loop

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

void BTprocessCommand(String data)

{

}

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

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_20230710"));

  }

}

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