#define R_BTN_PIN 33
#define G_BTN_PIN 34
#define B_BTN_PIN 35
#define R_COLOR_PIN 14
#define G_COLOR_PIN 13
#define B_COLOR_PIN 12
int r = 0;
int g = 0;
int b = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(R_BTN_PIN, INPUT_PULLUP);
  pinMode(G_BTN_PIN, INPUT_PULLUP);
  pinMode(B_BTN_PIN, INPUT_PULLUP);
  pinMode(R_COLOR_PIN, OUTPUT);
  pinMode(G_COLOR_PIN, OUTPUT);
  pinMode(B_COLOR_PIN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(R_BTN_PIN) == LOW)
  {
    r++;
    if (r > 255) r = 0;
  }
  if (digitalRead(G_BTN_PIN) == LOW)
  {
    g++;
    if (g > 255) g = 0;
  }
  if (digitalRead(B_BTN_PIN) == LOW)
  {
    b++;
    if (b > 255) b = 0;
  }
  analogWrite(R_COLOR_PIN, r);
  analogWrite(G_COLOR_PIN, g);
  analogWrite(B_COLOR_PIN, b);
  delay(10); // this speeds up the simulation
}