//NAMA: Joy Disanto Nupa
//NIM: 2209106014

const int BTN_NAIK = 7;
const int BTN_TURUN = 8;
const int POT = 3;
const int MOTOR = 2;

const int PWM_FREQ = 5000;
const int PWM_RES = 8;

int spd = 0;
int spdMax = 255;

int tNaik = 0;
int tTurun = 0;
int tNow = 0;
const int debounce = 200;

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

  pinMode(BTN_NAIK, INPUT_PULLUP);
  pinMode(BTN_TURUN, INPUT_PULLUP);
  pinMode(POT, INPUT);

  ledcAttach(MOTOR, PWM_FREQ, PWM_RES);
}

void loop() {
  int potVal = analogRead(POT);
  spdMax = map(potVal, 0, 4095, 0, 255);

  tNow = millis();

  if (digitalRead(BTN_NAIK) == LOW && (tNow - tNaik > debounce)) {
    spd += 5;
    if (spd > spdMax) spd = spdMax;
    tNaik = tNow;
  }

  if (digitalRead(BTN_TURUN) == LOW && (tNow - tTurun > debounce)) {
    spd -= 5;
    if (spd < 0) spd = 0;
    tTurun = tNow;
  }

  ledcWrite(MOTOR, spd);

  int rpm = map(spd, 0, 255, 0, 1000);

  Serial.print("MAX: ");
  Serial.print(spdMax);
  Serial.print(" | SPD: ");
  Serial.print(spd);
  Serial.print(" | RPM: ");
  Serial.println(rpm);

  delay(100);
}