Smart hydroponic system

smart-hydroponic-system.ino

#include <elapsedMillis.h>
#include <SoftwareSerial.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <afstandssensor.h>

SoftwareSerial Bluetooth(11, 10);
elapsedMillis send_timer;
elapsedMillis view_timer;
elapsedMillis pump_timer;
elapsedMillis light_timer;
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
AfstandsSensor ultrasonicSensor(A1, A0);

int light_state = 0;
int pump_state = 0;
float humidity = 0;
float temperature = 0;
float water_level = 0;
float ph_reading = 0;
float growth = 0;

int display_switcher = 0;

#define ph_pin A3
#define pump_pin A2
#define light_pin 5

#define Offset 0.00            //deviation compensate
#define samplingInterval 20
#define printInterval 800
#define ArrayLenth  40    //times of collection
int pHArray[ArrayLenth];   //Store the average value of the sensor feedback
int pHArrayIndex = 0;

void setup() {
  Serial.begin(9600);
  Bluetooth.begin(9600);
  Wire.begin();
  
  while (!Serial) {;;}
  while (!Bluetooth) {;;}

  // pinMode(ph_pin, INPUT);
  pinMode(pump_pin, OUTPUT);
  pinMode(light_pin, OUTPUT);
  digitalWrite(pump_pin, 1);
  digitalWrite(light_pin, 1);

  lcd.begin(16, 2);
  lcd.print("HYDROPONIC     ");
  lcd.setCursor(0, 1);
  lcd.print("         SYSTEM");

  delay(3000);
  lcd.clear();
}

void loop() {
  if (view_timer > 3000) {
    view_timer = 0;
    display_switcher++;
    if (display_switcher > 7) {
      display_switcher = 1;
    }
  }
  if (send_timer > 3000) {
    send_timer = 0;
    sendData();
  }

  if (pump_timer > (60000 * 2) && digitalRead(pump_pin) == 1) { 
    pump_timer = 0;
    digitalWrite(pump_pin, 0);
  }
  else if (pump_timer > (60000 * 1) && digitalRead(pump_pin) == 0) { 
    pump_timer = 0;
    digitalWrite(pump_pin, 1);
  }
  
  if (light_timer > (60000 * 5) ) { 
    light_timer = 0;
    digitalWrite(light_pin, !digitalRead(light_pin));
  }

  display();

  _light();
  _water();
  _temperature();
  _pump();
  _humidity();
  _ph();
  _growth();

  // if (Serial.available() > 0) {
  //   Bluetooth.write(Serial.read());
  // }
  // if (Bluetooth.available() > 0) {
  //   Serial.write(Bluetooth.read());
  // }
  // digitalWrite(pump_pin, 1);
  // digitalWrite(light_pin, 1);
  // delay(1000);
  // digitalWrite(pump_pin, 0);
  // digitalWrite(light_pin, 0);
  // delay(1000);
}

void display() {
  if (display_switcher == 1) {
    lcd.setCursor(0, 0);
    lcd.print("Light status:   ");
    lcd.setCursor(0, 1);

    String state = light_state == 1 ? "on " : "off";
    lcd.print("     ");
    lcd.print(state);
    lcd.print("        ");
  }
  else if (display_switcher == 2) {
    lcd.setCursor(0, 0);
    lcd.print("Water level:    ");
    lcd.setCursor(0, 1);

    String level = "   " + String(water_level) + " cm                 ";
    if (level.length() > 16) {
      level = level.substring(0, 16);
    }
    lcd.print(level);
  }
  else if (display_switcher == 3) {
    lcd.setCursor(0, 0);
    lcd.print("Temperature:    ");
    lcd.setCursor(0, 1);
    
    String temp = "   " + String(temperature) + " *C                 ";
    if (temp.length() > 16) {
      temp = temp.substring(0, 16);
    }
    lcd.print(temp);
  }
  else if (display_switcher == 4) {
    lcd.setCursor(0, 0);
    lcd.print("Pump status:    ");
    lcd.setCursor(0, 1);
    
    String state = light_state == 1 ? "on " : "off";
    lcd.print("     ");
    lcd.print(state);
    lcd.print("        ");
  }
  else if (display_switcher == 5) {
    lcd.setCursor(0, 0);
    lcd.print("Humidity:       ");
    lcd.setCursor(0, 1);
    
    String humi = "   " + String(humidity) + " %                   ";
    if (humi.length() > 16) {
      humi = humi.substring(0, 16);
    }
    lcd.print(humi);
  }
  else if (display_switcher == 6) {
    lcd.setCursor(0, 0);
    lcd.print("PH reading:     ");
    lcd.setCursor(0, 1);
    
    String ph = "   " + String(ph_reading) + "                      ";
    if (ph.length() > 16) {
      ph = ph.substring(0, 16);
    }
    lcd.print(ph);
  }
  else if (display_switcher == 7) {
    lcd.setCursor(0, 0);
    lcd.print("Growth rate:    ");
    lcd.setCursor(0, 1);

    String rate = "   " + String(growth) + " cm                   ";
    if (rate.length() > 16) {
      rate = rate.substring(0, 16);
    }
    lcd.print(rate);
  }
}

void _light() {
  light_state = digitalRead(light_pin); // 0 or 1
}

void _water() {
  water_level = 10; // cm
}

void _temperature() {
 temperature = 24.56; // degrees Celsius
}

void _pump() {
  pump_state = digitalRead(pump_pin); // 0 or 1
}

void _humidity() {
  humidity = 30.23; // %
}

void _ph() {
  ph_reading = analogRead(ph_pin);
  // // float Po = analogRead(ph_pin) * 5.0 / 1024;
  // // float phValue = 7 - (2.5 - Po) * m;

  // static unsigned long samplingTime = millis();
  // static unsigned long printTime = millis();
  // static float pHValue, voltage;

  // if (millis() - samplingTime > samplingInterval) {
  //     pHArray[pHArrayIndex++] = analogRead(ph_pin);
  //     if (pHArrayIndex == ArrayLenth) pHArrayIndex = 0;
  //     voltage = avergearray(pHArray, ArrayLenth) * 5.0 / 1024;
  //     pHValue = 3.5 * voltage + Offset;
  //     samplingTime = millis();
  // }
  // if (millis() - printTime > printInterval) {   //Every 800 milliseconds, print a numerical, convert the state of the LED indicator
  //   // Serial.print("Voltage:");
  //   // Serial.print(voltage, 2);
  //   // Serial.print("    pH value: ");
  //   // Serial.println(pHValue, 2);
  //   ph_reading = pHValue;
  //   // if (ph_reading < 1 || ph_reading > 14) ph_reading = 7.00;
  //   // digitalWrite(LED, digitalRead(LED)^1);
  //   printTime = millis();
  // }

}

void _growth() {
  growth = ultrasonicSensor.afstandCM(); // cm
  if (growth < 0) growth = 0;
}

void sendData() {
    // Serial.print("{");
    // Serial.print("\"data\":");
    // Serial.print("{");
    // Serial.print("\"light\":");
    // Serial.print(light_state);
    // Serial.print(",");
    // Serial.print("\"water\":");
    // Serial.print(water_level);
    // Serial.print(",");
    // Serial.print("\"temperature\":");
    // Serial.print(temperature);
    // Serial.print(",");
    // Serial.print("\"pump\":");
    // Serial.print(pump_state);
    // Serial.print(",");
    // Serial.print("\"humidity\":");
    // Serial.print(humidity);
    // Serial.print(",");
    // Serial.print("\"ph\":");
    // Serial.print(ph_reading);
    // Serial.print(",");
    // Serial.print("\"growth\":");
    // Serial.print(growth);
    // Serial.print("}}");
    // Serial.println();

    Bluetooth.print("{");
    Bluetooth.print("\"data\":");
    Bluetooth.print("{");
    Bluetooth.print("\"light\":");
    Bluetooth.print(light_state);
    Bluetooth.print(",");
    Bluetooth.print("\"water\":");
    Bluetooth.print(water_level);
    Bluetooth.print(",");
    Bluetooth.print("\"temperature\":");
    Bluetooth.print(temperature);
    Bluetooth.print(",");
    Bluetooth.print("\"pump\":");
    Bluetooth.print(pump_state);
    Bluetooth.print(",");
    Bluetooth.print("\"humidity\":");
    Bluetooth.print(humidity);
    Bluetooth.print(",");
    Bluetooth.print("\"ph\":");
    Bluetooth.print(ph_reading);
    Bluetooth.print(",");
    Bluetooth.print("\"growth\":");
    Bluetooth.print(growth);
    Bluetooth.print("}}");
    Bluetooth.println();
    // Bluetooth.flush();
}


double avergearray(int* arr, int number) {
  int i;
  int max,min;
  double avg;
  long amount=0;
  if (number <= 0) {
    Serial.println("Error number for the array to avraging!/n");
    return 0;
  }
  if (number < 5) {   //less than 5, calculated directly statistics
    for(i=0; i < number; i++) {
      amount += arr[i];
    }
    avg = amount / number;
    return avg;
  }
  else {
    if (arr[0] < arr[1]) {
      min = arr[0];
      max = arr[1];
    }
    else {
      min = arr[1];
      max = arr[0];
    }
    for (i=2; i < number; i++) {
      if (arr[i] < min) {
        amount += min;        //arr<min
        min = arr[i];
      } else {
        if (arr[i] > max) {
          amount += max;    //arr>max
          max = arr[i];
        } else {
          amount += arr[i]; //min<=arr<=max
        }
      }
    }
    avg = (double) amount / (number - 2);
  }
  return avg;
}




/*********************************************
 * 
 * Please leve this section for future use
 * 
 * Created By Mussa Charles
 * 
 * @ 2021
 * 
 * https://www.facebook.com/mussacharles60
 * 
 * https://www.github.com/mussacharles60
 * 
 * https://www.instagram.com/mussacharles60
 * 
 * https://www.twitter.com/mussacharles60
 * 
 * https://www.youtube.com/mussacharles60
 * 
 * mussacharles60@gmail.com
 * 
 * +255 716 581 823
 * 
 * --- let it happen :) ---
 * 
 * Please leve this section for future use
 * 
 ********************************************/