ProMicro/millis.ino at main · dcback/ProMicro · GitHub

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/*
    [ATmega32U4 Pinout]
              ----------
        TX=1-| ProMicro |-RAW
        RX=0-|          |-GND
         GND-|          |-RST
         GND-|          |-VCC
       SDA=2-|          |-21=A3
    SCL=3(~)-|          |-20=A2
        A6=4-|          |-19=A1
        5(~)-|          |-18=A0
     A7=6(~)-|          |-15=SCLK
           7-|          |-14=MISO
        A8=8-|          |-16=MOSI
     A9=9(~)-|          |-10(~)=A10
              ----------
*/
#define ledPin          17    // RX_LED

bool ledState = LOW;
unsigned long previousMillis = 0;   // will store last time LED was updated
const long interval = 1000;         // interval at which to blink (milliseconds)

void setup()
{
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
}

void loop()
{
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval)
  {
    previousMillis = currentMillis;   // save the last time at blinked the LED
    digitalWrite(ledPin, ledState);   // set the LED with the ledState of the variable:
    Serial.print(currentMillis / 1000);
    Serial.print("초 : ");
    Serial.println(ledState);
    ledState = !ledState;
  }
}