// https://wokwi.com/projects/353163986319942657
// https://forum.arduino.cc/t/logic-to-trigger-relay-based-on-sensor-counts-over-a-unit-of-time/1073844

# define windPin    6
# define pumpLED    7   // pump running lamp

# define LOCKOUT  15000 // pump disabled for 15 seconds

unsigned long pumpLockoutTimer;

void setup() {
  Serial.begin(115200);
  Serial.println("wind jammer demo\n");

  pinMode(windPin, INPUT_PULLUP);
  pinMode(pumpLED, OUTPUT);

  turnOffPump();
  turnOnPump();
}

unsigned long now;      // time for all non-blocked functions

void loop()
{
  now = millis();

  windSpeedPumpControl();   // calculate wind speed and turn on/off/lockout fan
  report();
}

void windSpeedPumpControl()
{
  static unsigned long lastPrint;
  static unsigned long counter;

  if (windSensorCheck()) {
    turnOffPump();
    pumpLockoutTimer = now;
  }

  if (now - pumpLockoutTimer > LOCKOUT) {
    turnOnPump();
  }
}

float theWindSpeed;

# define RESET  2000  // may not need to, but if no activity, throw out old data.
# define REPORT 100   // throttle flagging the high wind condition
# define WINDY  7.0   // worked for button pressing wildly

// maintains windSpeed with a low pass filter on debounced sensor clicks
bool windSensorCheck()
{
  static byte lastReading;
  static unsigned long lastTime;
  static unsigned long lastEventTime;

  static float windPeriod;

// debounce
  if (now - lastTime < 10) {     // limits usefulness to 100 Hz
    return theWindSpeed > WINDY;
  }

  if (now - lastTime > RESET) {
    windPeriod = 999.9;
    theWindSpeed = 0.0;

    lastTime = now;
  }

  byte windReading = !digitalRead(windPin);  // LOW = wind

  if (lastReading != windReading) {
    if (windReading) {
      windPeriod = 0.9 * windPeriod + 0.1 * (now - lastTime);

      theWindSpeed = 1000.0 / windPeriod;
    }

    lastReading = windReading;
    lastTime = now;
  }

  return theWindSpeed > WINDY;
}

bool pumpIsOn;  // just so the pump is only switched if it is in the wrong state

void turnOnPump()
{
  if (!pumpIsOn) {
    pumpIsOn = true;    
    Serial.println("turn pump ON");
    digitalWrite(pumpLED, HIGH);    // and do whatever else needs be done 

  }
}

void turnOffPump()
{
  if (pumpIsOn) {
    pumpIsOn = false;
    Serial.println("turn pump OFF");
    digitalWrite(pumpLED, LOW);   // and do whatever else needs be done 

  }
}

// reporting only - adjust for taste
void report()
{
  static unsigned long lastPrint;
  static unsigned long counter;

  if (now - lastPrint > 777) {
    Serial.print(counter); counter++;
    Serial.print(" ");
    Serial.println(theWindSpeed);

    lastPrint = now;
  }
}