/*
   Project:       Soil Moisture Controller
   Description:   Keeps soil moisture within a certain range.
                  If sensor indicates soil is dry
                  Run pump for PUMP_TIME milliseconds (default 45s)
                  Wait for SOAK_TIME milliseconds (default 10 mins)
                  Repeat
                  NOTE: Initial Flow rate is 1L/3min
   Creation date: 10/16/23
   Author:        AnonEngineering

   Gregnor — 10/15/23 at 12:10 AM Arduino #coding-help

   License: https://en.wikipedia.org/wiki/Beerware
*/

const unsigned long PUMP_TIME = 2000;
const unsigned long SOAK_TIME = 10000;
const int DRY_VAL = 380;  // value to be considered dry
const int WET_VAL = 280;  // value to be considered watered
const int STATUS_LEDS[3] = {4, 3, 2}; // dry, norm, wet
const int PUMP_PIN = 9;     // pump control pin
const int SENSOR_PIN = A0;  // higher values = drier

int state = 0;
int lastSenseValue = -1;
unsigned long lastPump = 0;
unsigned long lastSoak = 0;

void setIndicators(int value) {
  for (int i = 0; i <= 2; i++)  {
    digitalWrite(STATUS_LEDS[i], LOW);
  }
  digitalWrite(STATUS_LEDS[value], HIGH);
}

void setup() {
  Serial.begin(9600);
  for (int i = 0; i <= 2; i++)  {
    pinMode(STATUS_LEDS[i], OUTPUT);
  }
  pinMode(PUMP_PIN, OUTPUT);
}

void loop() {
  int sensorValue = analogRead(SENSOR_PIN);
  if (sensorValue != lastSenseValue)  {
    lastSenseValue = sensorValue;
    Serial.print("Sensor reading: ");
    Serial.println(sensorValue);
  }
  if (state == 0) { // measure
    if (sensorValue >= DRY_VAL) { // dry, run pump
      setIndicators(0);
      digitalWrite(PUMP_PIN, HIGH);
      lastPump = millis();
      state = 1;
    } else if (sensorValue <= WET_VAL)  { // wet
      setIndicators(2);
      lastSoak = millis();
      state = 2;
    } else  { // nominal
      setIndicators(1);
      lastSoak = millis();
      state = 2;
    }
  }
  if (state == 1)  { // needs water
    if (millis() - lastPump > PUMP_TIME)  {
      lastSoak = millis();
      state = 2;
      digitalWrite(PUMP_PIN, LOW);
    }
  }
  if (state == 2)  {  // wait to soak
    if (millis() - lastSoak > SOAK_TIME) {
      state = 0;
    }
  }
}

/*
#define PUMP_PIN 2     // Water Pump Power
#define SENSOR_PIN A0  // Capacitive soil humidity sensor, higher values mean more dry.  420 bone dry, 220 in a cup of water.  Possible this need calibration for every sensor
int dry_level = 380;   //  value to be considered dry
int wet_level = 280;   // value to be reached to be considered watered
// const unsigned long the_delay = 10000;        // time between readings. Not used yet
const unsigned long pump_on_time = 4500;      // watering time for pump to be @45sec  NOTE: Initial Flow rate is 1ltr/3min measured.  Could use recalibration depending on plant.
const unsigned long water_dispersion = 6000;  // time for water to disperse through the medium  to be @10min Could use recalibration depending on pot size and soil medium
// const unsigned long follow_water = 30000;     // time on a follow up water if soild humidity not reached @30sec.  Not used yet
unsigned long PT = 0;

boolean water_start = true;  // Only to make start of watering true
boolean pump_running = true;
boolean water_disTime = true;
boolean timer = true;  //  Marker to make sure only one update on PT is done
boolean water_cycle = true;
// boolean water_follow = true;   //  Is another pump running.  Not used yet


void setup() {
  Serial.begin(9600);
  pinMode(PUMP_PIN, OUTPUT);
}

void loop() {
  unsigned long currentTime = millis();
  int sensorValue = analogRead(SENSOR_PIN);
  if (water_cycle == false) {
    if (sensorValue > dry_level) {
      water_cycle = true;
      water_start = true;
    }
  }
  if (water_start == true) {  // Only to make start of watering true
    digitalWrite(PUMP_PIN, HIGH);
    pump_running = true;
    water_start = false;
  }
  if (water_cycle == true) {
    do {
      if (water_disTime == false) {
        do {  // Start of watering
          digitalWrite(PUMP_PIN, HIGH);
          pump_running = true;
          if (timer == false) {  // Timer Set-up
            PT = currentTime;
            timer = true;
          }
          if (currentTime - PT >= pump_on_time) {  // Timer
            digitalWrite(PUMP_PIN, LOW);
            pump_running = false;
            timer = false;
          }
        } while (pump_running == true);
      }

      if (pump_running == false) {  // Start of Water Dispersion
        water_disTime = true;
        if (timer == false) {  // Timer Set-up
          PT = currentTime;
          timer = true;
        }
        if (currentTime - PT >= water_dispersion) {  // Timer
          water_disTime = false;
          timer = false;
          sensorValue = analogRead(SENSOR_PIN);
          if (sensorValue < wet_level) { water_cycle = false; }
        }
      }
    } while (water_dispersion == true);
  }
  while (water_cycle = true)
    ;
}
*/