const int LEDR = 5;
const int LEDB = 6;
const int BT = 10;
int SL = HIGH;



void setup() {
pinMode(LEDR, OUTPUT);
pinMode(LEDB, OUTPUT);
pinMode(BT, INPUT_PULLUP);

}

void loop() {
if(digitalRead(BT) == LOW);
{
digitalWrite(LEDR, SL);
digitalWrite(LEDB, !SL);
delay(500);
SL = !SL;
}



}