//--------------------------------------------------------------------------------------------------------------------------------------- int a = 0; int b = 1; int c = 2; int d = 3; void setup() { pinMode(a, OUTPUT); pinMode(b, OUTPUT); pinMode(c, OUTPUT); pinMode(d, OUTPUT); } void loop() { digitalWrite(a, HIGH); digitalWrite(b, LOW); digitalWrite(c, LOW); digitalWrite(d, LOW); delay(1000); digitalWrite(a, LOW); digitalWrite(b, HIGH); digitalWrite(c, LOW); digitalWrite(d, LOW); delay(1000); digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, LOW); digitalWrite(d, LOW); delay(1000); digitalWrite(a, LOW); digitalWrite(b, LOW); digitalWrite(c, HIGH); digitalWrite(d, LOW); delay(1000); digitalWrite(a, HIGH); digitalWrite(b, LOW); digitalWrite(c, HIGH); digitalWrite(d, LOW); delay(1000); digitalWrite(a, LOW); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, LOW); delay(1000); digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, LOW); delay(1000); digitalWrite(a, LOW); digitalWrite(b, LOW); digitalWrite(c, LOW); digitalWrite(d, HIGH); delay(1000); digitalWrite(a, HIGH); digitalWrite(b, LOW); digitalWrite(c, LOW); digitalWrite(d, HIGH); delay(1000); digitalWrite(a, LOW); digitalWrite(b, LOW); digitalWrite(c, LOW); digitalWrite(d, LOW); delay(1000); } //---------------------------------------------------------------------------------------------------------------------------------------