blink.ino

#include <dummy.h>

const int SWITCH_PIN = 0;

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(SWITCH_PIN, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(SWITCH_PIN) == LOW) {
    blink(150, 100);
  }
  else {
    digitalWrite(LED_BUILTIN, HIGH);
    delay(100);
  }
}

void blink(int onTime, int offTime) {
  digitalWrite(LED_BUILTIN, LOW);
  delay(onTime);
  digitalWrite(LED_BUILTIN, HIGH);
  delay(offTime);
}