#include <Arduino.h>

const int BUTTON_COUNT = 5;

// Button GPIO pins
const int buttonPins[BUTTON_COUNT] = {
  20, 8, 9, 10, 7
};

// LED GPIO pins
const int ledPins[BUTTON_COUNT] = {
  6, 5, 4, 3, 2
};

void setup() {

  Serial.begin(115200);

  // Set up buttons
  for (int i = 0; i < BUTTON_COUNT; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }

  // Set up LEDs
  for (int i = 0; i < BUTTON_COUNT; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);
  }

  Serial.println("ESP32-C3 Button Pad Ready!");
}

void loop() {

  for (int i = 0; i < BUTTON_COUNT; i++) {

    // INPUT_PULLUP means:
    // LOW  = button pressed
    // HIGH = button released

    if (digitalRead(buttonPins[i]) == LOW) {

      digitalWrite(ledPins[i], HIGH);

      Serial.print("Button ");
      Serial.print(i + 1);
      Serial.println(" pressed!");

    } else {

      digitalWrite(ledPins[i], LOW);
    }
  }

  delay(10);
}