// https://deepbluembedded.com/esp32-digital-inputs-outputs-arduino/

#define LED_RED_GPIO 2
#define LED_GREEN_GPIO 32
#define BTN_GPIO 23
 
int BTN_State = 0; // Variable To Store Button State
int LED_GREEN_Brightness = 0;    // how bright the LED is
int LED_GREEN_fadeAmount = 5;    // how many points to fade the LED by
 
void setup()
{
  pinMode(LED_RED_GPIO, OUTPUT);
  pinMode(LED_GREEN_GPIO, OUTPUT);
  pinMode(BTN_GPIO, INPUT);
}
 
void loop()
{
  // Read The Button State
  BTN_State = digitalRead(BTN_GPIO);
  // Assign The BTN State To The LED Pin
  digitalWrite(LED_RED_GPIO, BTN_State);
  analogWrite(LED_GREEN_GPIO, LED_GREEN_Brightness);

  // change the brightness for next time through the loop:
  LED_GREEN_Brightness = LED_GREEN_Brightness + LED_GREEN_fadeAmount;

  // reverse the direction of the fading at the ends of the fade:
  if (LED_GREEN_Brightness <= 0 || LED_GREEN_Brightness >= 255) {
    LED_GREEN_fadeAmount = -LED_GREEN_fadeAmount;
  }

  delay(20);

}