ProMicro/button.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
#define buttonPin       2

bool buttonState = 0;

void setup()
{
  Serial.begin(115200);

  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop()
{
  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH)
  {
    digitalWrite(ledPin, HIGH);    // turn LED on:
  }
  else
  {
    digitalWrite(ledPin, LOW);   // turn LED off:
  }
  Serial.print("buttonState[");
  Serial.print(buttonState);
  Serial.println("] ");

  delay(1000);
}