Blue Tooth Code Test

Code Example

        char switchstate;     
        void setup()  { 
        Serial.begin(9600);
         
        pinMode(LED_BUILTIN,  OUTPUT);
        
        }
        void loop() { 
          while(Serial.available()>0)
          {       
            switchstate = Serial.read();
            Serial.print(switchstate);
            delay(15);
            if(switchstate  == '1'){ 
            digitalWrite(LED_BUILTIN, HIGH);
              
            }
            else if(switchstate == '0'){ 
            digitalWrite(LED_BUILTIN, LOW); 
            }
          }
        }