Read soil humidity and enable a water pump to give water

ReadSoilHumidity.ino

// Calibration values
const int AIR_VALUE = 831;
const int WATER_VALUE = 434;

// Pin values
const int SOIL = A0;
const int PUMP = 1;

// Thresholds & time intervals
const long HUMIDITY_THRESHOLD = 30; // 30% soil humidity
const long WATERING_INTERVAL_MS = 3600 * 1000; // 1 hour
const long LOOP_INTERVAL_MS = 300 * 1000; //5 minutes

// State variables
long lastWaterGiven = 0;

void setup() {
  Serial.begin(9600);
  pinMode(PUMP, OUTPUT);
  pinMode(SOIL, INPUT);
}

void loop() {
   delay(LOOP_INTERVAL_MS);
   long humidityPercentage = getHumidityPercentage();
   
   reportHumidityPercentage(humidityPercentage);
   
   if (shouldGiveWater(humidityPercentage)){
     giveWater();
     reportWaterGiven();
   }
}

void giveWater(){
  digitalWrite(PUMP, HIGH);
  delay(2000);
  digitalWrite(PUMP, LOW);

  // Record last time we gave water
  lastWaterGiven = millis();
}

bool shouldGiveWater(long humidityPercentage){
  long now = millis();
  return humidityPercentage <= HUMIDITY_THRESHOLD && now
}

long getHumidityPercentage(){
  int sensorValue = analogRead(A0);
  return map(sensorValue, WATER_VALUE, AIR_VALUE, 100, 0);
}

void reportHumidityPercentage(long humidityPercentage){
  // Stub method, will write to TX and let the bridge report to HomeAssistant
  Serial.print(humidityPercentage);
}

void reportWaterGiven(){
  // Stub method, will write to TX and let the bridge report to HomeAssistant
  Serial.print("Water given!");
}