#define LedRed 3 
#define LedBlue 10
void setup() {
pinMode(LedRed, OUTPUT);
pinMode(LedBlue, OUTPUT);
}


void loop() {
digitalWrite(LedRed, HIGH);
digitalWrite(LedBlue, LOW);
delay(500);
digitalWrite(LedRed, LOW);
digitalWrite(LedBlue, HIGH);
delay(500);
}