int ld1 = 2; int ld2 = 5; int ld3 = 4; int ld4 = 3; void setup() { pinMode(ld1, OUTPUT); pinMode(ld2, OUTPUT); pinMode(ld3, OUTPUT); pinMode(ld4, OUTPUT); } void loop() { digitalWrite(ld1, LOW); digitalWrite(ld2, LOW); digitalWrite(ld3, LOW); digitalWrite(ld4, LOW); delay(1000); digitalWrite(ld1, HIGH); delay(1000); digitalWrite(ld1, LOW); digitalWrite(ld2, HIGH); delay(1000); digitalWrite(ld1, HIGH); delay(1000); digitalWrite(ld1, LOW); digitalWrite(ld2, LOW); digitalWrite(ld3, HIGH); delay(1000); digitalWrite(ld1, HIGH); delay(1000); digitalWrite(ld1, LOW); digitalWrite(ld2, HIGH); delay(1000); digitalWrite(ld1, HIGH); delay(1000); digitalWrite(ld1, LOW); digitalWrite(ld2, LOW); digitalWrite(ld3, LOW); digitalWrite(ld4, HIGH); delay(1000); digitalWrite(ld1, HIGH); delay(1000); }