Arduino notes-Arduino UNO and WeMos D1 serial communication (data interaction)

The schematic is like this:

Device A represents Arduino UNO and device B represents WeMos D1.

The actual connection diagram is as follows:

The screenshot of the program is as follows:

This is the serial port print on Arduino. The S in front means Arduino sends character S. When character B is received, it will print receive wemods data

Here is the source code:

Arduino uno source code:

void setup() {

  Serial.begin(9600);
  pinMode(LED_BUILTIN, OUTPUT);
}


void loop() {
  digitalWrite(LED_BUILTIN, HIGH); 
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW); 
  delay(1000);

  Serial.write("S");
  while(Serial.available() > 0){

     char wemosChar = Serial.read();
     if(wemosChar == 'B'){

       Serial.println("receive wemods data");
     }
  }

  delay(1000);
}

WeMos D1 source code:

void setup() {

  Serial.begin(9600);
  pinMode(LED_BUILTIN, OUTPUT);
}


void loop() {
  
  digitalWrite(LED_BUILTIN, LOW);                               
  delay(1000);                     
  digitalWrite(LED_BUILTIN, HIGH);  
  delay(1000);     

  while(Serial.available() > 0){

     char getChar = Serial.read();
     if(getChar == 'S'){

        Serial.write("B");
     }
  }

  delay(1000); 
}

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