Automatic Snake Plant Watering Device

//  -------------------------
// |  Plant Watering Device  | 
// |    for Particle Argon   |
//  -------------------------
// |    MEGR 3171 Group 27   |
// |       Jacob Brooks      |
// |      Jack Doganiari     |
//  -------------------------
// |  Code by: Jacob Brooks  |
//  -------------------------

// Pin Assignments:
// - D6: Output: Pump relay
// - D7: Output: LED
// - A1: Input: Moisture Sensor 

// Function prototypes
void waterPlant(int amount);   // Function for watering plant
double checkMoisture();   // Function for checking moisture sensor

// Handler for Subscribe function
int finds;  // Variable to hold the count of recieved reciept reciepts
void myHandler(const char *event, const char *data)
{
    for (int i=1; i<51; i++) // Repeat 50 times
    {
        digitalWrite(D7,HIGH); // Turn LED on 
        delay (100);  // Wait 100 ms
        digitalWrite(D7,LOW);  // Turn LED off
        delay (100);  // Wait 100 ms
    }
    finds ++;  // Increase recieved count by 1
    Particle.publish("return_recieved_reciept");  // Publish reciept of singal recieved
}


// Declare constants
const int water_ml = 100;   // How much water (in ml) the pump dispenses
const int moistureThreshold = 42;   // Moisture percent trigger threshold
const int wateringDay1 = 1;   // Day of the month when the pump turns on
const int wateringDay2 = 6;   // Second day of the month when the pump turns on
const int wateringDay3 = 15;   // 3rd ...
const int wateringDay4 = 22;   // 4th ... 
const int wateringHour = 12+1;   // Hour at which the pump turns on (24 hour format)
const int wateringMinute = 0;   // Minute at which if statements trigger
const int timeZoneOffset = -5;   // Time zone offset from Greenwich, England (Eastern Standard Time, USA)
const int delayPeriod = 60000;   // How long the argon delays after each main loop (milliseconds)

// Declare other variables
int date;   // Date variable
int hour;   // Hour variable
int minute;   // Minute variable
int second;   // Second variable
double moisture_percent;   // Variable for moisture percent
int lastWaterDate;   // Variable for last watering date

// Debug toggles
bool displayDateTime = false;   // Publishes date and time each loop cycle
bool debugHour = false;   // Causes every hour to be the watering hour
bool debugMinute = false;   // Causes every minute to be the watering/moisture checking minute
bool debugDate = false;   // Causes the watering day to be every day
bool debugMoisture = false; // Causes the moisture level threshold to trigger

void setup() 
{
    // Set up time zone 
    Time.zone(timeZoneOffset);
    
    // Set up inputs and outputs
    pinMode(D6,OUTPUT);   // Output for pump relay
    pinMode(D7,OUTPUT);   // Output for LED
    pinMode(A1,INPUT);   // Input for soil moisture sensor
    
    // Set up particle variables
    Particle.variable("moisture_percent",moisture_percent);
    Particle.variable("lastWaterDate",lastWaterDate);
    Particle.variable("finds",finds);
    
    // Set up particle Subscribe
    Particle.subscribe("recieved_reciept",myHandler);
    
}

// Main loop
void loop() 
{
    // Check date and time
    date = Time.day(); 
    hour = Time.hour(); 
    minute = Time.minute(); 
    second = Time.second(); 
    
    // Display date and time for debug if toggle is active
    if (displayDateTime == true)
    {
        Particle.publish("date",String(date));
        Particle.publish("hour",String(hour));
        Particle.publish("minute",String(minute));
        Particle.publish("second",String(second));
    }
    
    // Check to see if it is time to check moisture / time to water
    if (minute == wateringMinute || debugMinute == true)
    {
        // Check moisture level
        moisture_percent = checkMoisture();
        
        // Publish moisture percent
        Particle.publish("moisture_percent",String(moisture_percent));
        
        // Check to see if moisture is below threshold
        if (moisture_percent < moistureThreshold || debugMoisture == true)
        {
            // Check to see if it is the correct hour...
            if (hour == wateringHour || debugHour == true)
            {
                // Check to see if it is on the correct day
                if (date == wateringDay1 || date == wateringDay2 || date == wateringDay3 || date == wateringDay4 || debugDate == true)
                {
                    // Publish water notification
                    Particle.publish("Watering (mL)",String(water_ml));
                    
                    // Water plant
                    waterPlant(water_ml);
                    
                    // Update last watering date variable
                    lastWaterDate = date;
                }
            }
        }
    }
    
    // Delay before next cycle
    delay(delayPeriod);
}

// Function for watering plant
void waterPlant(int amount)
{
    // Turn on pump
    digitalWrite(D6,HIGH);
    
    // Convert ml to pump on time milliseconds, delay for that length of time
    float pumpTime = 41.248*amount+446.05;   // Function to convert ml out to pump on time
    int pumpTimeInt = pumpTime;  // Convert float to int
    delay (pumpTimeInt);
    
    // Turn pump off
    digitalWrite(D6, LOW);
}

// Function for checking moisture sensor
double checkMoisture()
{
    // Define function variables: moisturePercent=m*sensor+b
    double m = -0.0220088035; double b = 89.90596235;
    
    // Read analog input and convert raw data to moisture percent
    double moisturePercent = m*analogRead(A1)+b;  // Function to convert raw sensor data to moisture percent
    return moisturePercent;
}