// the setup function runs once when you press reset or power the board void setup() { pinMode(LED_BUILTIN, OUTPUT); } const int t =200; void S (){ digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level) delay(t); // wait for a second digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW delay(t); digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level) delay(t); // wait for a second digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW delay(t); digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level) delay(t); // wait for a second digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW delay(t); delay(3*t); } void O (){ digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level) delay(t); // wait for a second digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW delay(3*t); digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level) delay(t); // wait for a second digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW delay(3*t); digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level) delay(t); // wait for a second digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW delay(3*t); delay(3*t); // wait for a second } // initialize digital pin LED_BUILTIN as an output // the loop function runs over and over again forever void loop() { S(); O(); S(); }