Automated Gardening Plant with Arduino Uno

Automated gardening kit is a system that allows controlling and automatic watering of a small plant. Learn about environment and go green!

Feb 18, 2020

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greener planet

plants

Components and supplies

Arduino UNO Wifi Rev.2

Project description

Code

Automated gardening kit

c_cpp

1<p>//import the library to control LCD display, this library has been   added manually through ZIP file<br>#include 
2</p><p>//import library for DHT   sensor
3#include "dht.h"
4#define dht_apin A3 // Analog Pin sensor is connected   to</p><p>//create DHT object
5dht DHT;</p><p>// create LCD object
6LiquidCrystal_I2C   lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display</p><p>//declaration   of variable for buttond
7int ButtonOnePin = 10;  //pin for button 1
8int ButtonOneState   =0 ; //one variable to store current button state
9int ButtonOnePreviousState   = 0; //one variable to store previous button state
10int ButtonTwoPin = 9; // same   for button 2
11int ButtonTwoState =0 ;
12int ButtonTwoPreviousState = 0;</p><p>unsigned   long timeBeginDisplay=0;
13int timeDisplayPeriod = 6000; //period the 2nd and 3rd   screen are displayed
14int valToDisplay = 0; //variable to decide what information   is to be displayed</p><p>int airTemp; //variable to store air temperature measured   by DHT11 sensor
15int airHumidity; //variable to store air humidity measured by   DHT11 sensor</p><p>int LedPin =  13; </p><p>int waterPumpPin=7; // pin on which   is connected the relay that command water pump
16int sprayNum=0; //variable to   store number of spraying 
17int pumpOn =false; //variable used for spraying, it   stays ON during the spray timing</p><p>int MoistureHigh = 800; 
18int MoistureGood   = 710;
19int MoistureLow = 630; //threshold that should launch water spray of the   plant
20int valSoil ;  //variable to store value measured by moisture sensor
21int   soilPin = A0; // pin on wich is connected moisture sensor
22int soilPower = 12;</p><p>int   timePeriod = 1000; //variable to store timing in ms, period between each display   refresh, a clear is called each time display is called 
23int humMeasurePeriod=0;   
24unsigned long currentMillis; //variable to store current timing
25unsigned   long debutMillis=0; //variable used to store timing at the debut of a period
26int   timePumpPeriod = 3000; //timing for water spraying
27unsigned long timePumpDebut   = 0; //variable used to store timing value for the debut of a spraying period</p><p>int   gazPin = 1; //pin on which is connected gaz sensor
28int valGaz ; //variable on   which is stored gaz sensor value</p><p>int lightPin = 2; //pin on which is connected   the photoresistor
29int valLight ; //variable on which light value is stored</p><p>//function   to read moisture sensor value
30int readSoil()
31{</p><p>    digitalWrite(soilPower,   HIGH);//turn D7 "On"
32    delay(10);//wait 10 milliseconds 
33    valSoil =   analogRead(soilPin);//Read the SIG value form sensor 
34    digitalWrite(soilPower,   LOW);//turn D7 "Off"
35    return valSoil;//send current moisture value
36}</p><p>//function   called to refresh LCD screen, displaying wanted screen regarding value of variable   "valToDisplay" 
37int toDisplay(){</p><p>  lcd.clear(); //clear the screen to   remove character that might not be overwritten by new message
38  
39  if (valToDisplay==0){
40     lcd.setCursor(0,0); //to put cursor on 1rst character of 1rst line
41    lcd.print("Temp:");
42     lcd.setCursor(6,0);
43    lcd.print("Hum:");
44    lcd.setCursor(11,0);
45     lcd.print("Mois:");
46    lcd.setCursor(0,1); //to put cursor on 1rst character   of 2nd line
47    lcd.print(airTemp);
48    lcd.setCursor(2,1);
49    lcd.print((char)223);   //special character for temperature
50    lcd.print("C");
51    lcd.setCursor(6,1);   
52    lcd.print(airHumidity);
53    lcd.setCursor(8,1); 
54    lcd.print("%");
55     lcd.setCursor(11,1); 
56    lcd.print(valSoil); 
57  }
58  else if (valToDisplay==1   && (currentMillis-timeBeginDisplay)</p><p>  if((currentMillis-timeBeginDisplay)>timeDisplayPeriod){   //display original screen when display period is over
59    valToDisplay=0;
60     //we display in this IF condition the 1rst screen because before there was a   blank screen after the timing
61    lcd.setCursor(0,0); //to put cursor on 1rst   character of 1rst line
62    lcd.print("Temp:");
63    lcd.setCursor(6,0);
64     lcd.print("Hum:");
65    lcd.setCursor(11,0);
66    lcd.print("Mois:");
67     lcd.setCursor(0,1); //to put cursor on 1rst character of 2nd line
68    lcd.print(airTemp);
69     lcd.setCursor(2,1);
70    lcd.print((char)223); //special character for temperature
71     lcd.print("C");
72    lcd.setCursor(6,1);  
73    lcd.print(airHumidity);
74     lcd.setCursor(8,1); 
75    lcd.print("%");
76    lcd.setCursor(11,1); 
77     lcd.print(valSoil); 
78  }
79  
80}</p><p>int readTempHum (){</p><p>    DHT.read11(dht_apin);   //read value from DHT sensor</p><p>    airTemp = DHT.temperature; //store temperature   value from sensor
81    airHumidity = DHT.humidity; // store humidity value from   sensor
82    
83    //delay(3000);//Wait 3 seconds before accessing sensor again,   without timing, sensor measurement is faulty. we commented this delay because this   function isn't called often
84}</p><p>int waterPump(){</p><p>  //the condition   below to command or not the water pump
85  if (valSoil</p><p>  //once the waterpump   cycle is launched, this if condition will turn ON the pump on the third of the timePumpPeriod   defined, the other 2 third, the water pump will be turned OFF
86  if (currentMillis-timePumpDebut=timePumpPeriod   && pumpOn==true){
87      pumpOn=false; //once pump cycle is over, variable value   change to make water spraying dependant on moisture value again
88      sprayNum++;   //add +1 to the number of spraying performed
89  }
90}</p><p>int waterTankAlarm(){
91   if (sprayNum>10){ //when number of spraying is above limit, turn on led to warn   user
92    digitalWrite(LedPin,HIGH);
93  }
94  else {
95    digitalWrite(LedPin,LOW);
96   }
97}</p><p>void setup() { 
98  // put your setup code here, to run once:
99   Serial.begin(9600);
100  //defining wich pin are IN or OUT
101  pinMode(LedPin,   OUTPUT);      
102  pinMode(ButtonOnePin, INPUT); 
103  pinMode(ButtonTwoPin, INPUT);   
104  pinMode(waterPumpPin, OUTPUT); </p><p>  // initialize the lcd
105  lcd.init();                        
106  lcd.backlight();
107  lcd.setCursor(0,0); 
108  lcd.print("Waking   up");</p><p>  //ready first temperature and humidity from DHT sensor to store value   (since this function isn't called often)
109  readTempHum();
110  
111  delay(2000);
112   lcd.clear();</p><p>  
113}</p><p>void loop() {</p><p>  //reading of sensor value,   not DHT due to the delay needed to its measurement
114  readSoil();
115  valGaz   = analogRead(gazPin);
116  valLight = analogRead(lightPin);</p><p>  currentMillis=millis();   //measurement of current time</p><p>  //small function to avoid button rebound,   when pressing once on the button, arduino reads only one pressing...
117  ButtonOneState=digitalRead(ButtonOnePin);   //reading of button value
118  if (ButtonOneState !=ButtonOnePreviousState){ //comparing   with previous state
119    if (ButtonOneState == HIGH){ //if previous state was   0 and current is 1, then take button pressing in account
120      delay(200);
121       valToDisplay=1;
122      timeBeginDisplay=currentMillis;
123    }
124    ButtonOnePreviousState=ButtonOneState;
125   }
126  //same function for button 2 as button 1
127  ButtonTwoState=digitalRead(ButtonTwoPin);
128   if (ButtonTwoState !=ButtonTwoPreviousState){
129    if (ButtonTwoState == HIGH){
130       delay(200);
131      valToDisplay=2; //particular value for "valToDisplay"
132       timeBeginDisplay=currentMillis;
133    }
134    ButtonTwoPreviousState=ButtonTwoState;
135   }
136  
137  waterPump(); //calling for water pump function which launch spray   cycle if needed</p><p>  waterTankAlarm(); //calling function to warn user about   water tank level</p><p>  //small condition for screen refreshing and measurement   of DHT sensor
138  if (currentMillis-debutMillis>timePeriod){ //end of a period
139     debutMillis=currentMillis; //define the begining of a new period
140    toDisplay();   //refresh of the screen regarding "valToDisplay" value
141    humMeasurePeriod++;   //DHT sensor values are measured every 20 times the screens is refreshed
142    if   (humMeasurePeriod>20){ //go to measure DHT values
143          readTempHum();
144           humMeasurePeriod=0;
145    }</p><p>  } </p><p>}</p>

<p>//import the library to control LCD display, this library has been   added manually through ZIP file<br>#include 
</p><p>//import library for DHT   sensor
#include "dht.h"
#define dht_apin A3 // Analog Pin sensor is connected   to</p><p>//create DHT object
dht DHT;</p><p>// create LCD object
LiquidCrystal_I2C   lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display</p><p>//declaration   of variable for buttond
int ButtonOnePin = 10;  //pin for button 1
int ButtonOneState   =0 ; //one variable to store current button state
int ButtonOnePreviousState   = 0; //one variable to store previous button state
int ButtonTwoPin = 9; // same   for button 2
int ButtonTwoState =0 ;
int ButtonTwoPreviousState = 0;</p><p>unsigned   long timeBeginDisplay=0;
int timeDisplayPeriod = 6000; //period the 2nd and 3rd   screen are displayed
int valToDisplay = 0; //variable to decide what information   is to be displayed</p><p>int airTemp; //variable to store air temperature measured   by DHT11 sensor
int airHumidity; //variable to store air humidity measured by   DHT11 sensor</p><p>int LedPin =  13; </p><p>int waterPumpPin=7; // pin on which   is connected the relay that command water pump
int sprayNum=0; //variable to   store number of spraying 
int pumpOn =false; //variable used for spraying, it   stays ON during the spray timing</p><p>int MoistureHigh = 800; 
int MoistureGood   = 710;
int MoistureLow = 630; //threshold that should launch water spray of the   plant
int valSoil ;  //variable to store value measured by moisture sensor
int   soilPin = A0; // pin on wich is connected moisture sensor
int soilPower = 12;</p><p>int   timePeriod = 1000; //variable to store timing in ms, period between each display   refresh, a clear is called each time display is called 
int humMeasurePeriod=0;   
unsigned long currentMillis; //variable to store current timing
unsigned   long debutMillis=0; //variable used to store timing at the debut of a period
int   timePumpPeriod = 3000; //timing for water spraying
unsigned long timePumpDebut   = 0; //variable used to store timing value for the debut of a spraying period</p><p>int   gazPin = 1; //pin on which is connected gaz sensor
int valGaz ; //variable on   which is stored gaz sensor value</p><p>int lightPin = 2; //pin on which is connected   the photoresistor
int valLight ; //variable on which light value is stored</p><p>//function   to read moisture sensor value
int readSoil()
{</p><p>    digitalWrite(soilPower,   HIGH);//turn D7 "On"
    delay(10);//wait 10 milliseconds 
    valSoil =   analogRead(soilPin);//Read the SIG value form sensor 
    digitalWrite(soilPower,   LOW);//turn D7 "Off"
    return valSoil;//send current moisture value
}</p><p>//function   called to refresh LCD screen, displaying wanted screen regarding value of variable   "valToDisplay" 
int toDisplay(){</p><p>  lcd.clear(); //clear the screen to   remove character that might not be overwritten by new message
  
  if (valToDisplay==0){
     lcd.setCursor(0,0); //to put cursor on 1rst character of 1rst line
    lcd.print("Temp:");
     lcd.setCursor(6,0);
    lcd.print("Hum:");
    lcd.setCursor(11,0);
     lcd.print("Mois:");
    lcd.setCursor(0,1); //to put cursor on 1rst character   of 2nd line
    lcd.print(airTemp);
    lcd.setCursor(2,1);
    lcd.print((char)223);   //special character for temperature
    lcd.print("C");
    lcd.setCursor(6,1);   
    lcd.print(airHumidity);
    lcd.setCursor(8,1); 
    lcd.print("%");
     lcd.setCursor(11,1); 
    lcd.print(valSoil); 
  }
  else if (valToDisplay==1   && (currentMillis-timeBeginDisplay)</p><p>  if((currentMillis-timeBeginDisplay)>timeDisplayPeriod){   //display original screen when display period is over
    valToDisplay=0;
     //we display in this IF condition the 1rst screen because before there was a   blank screen after the timing
    lcd.setCursor(0,0); //to put cursor on 1rst   character of 1rst line
    lcd.print("Temp:");
    lcd.setCursor(6,0);
     lcd.print("Hum:");
    lcd.setCursor(11,0);
    lcd.print("Mois:");
     lcd.setCursor(0,1); //to put cursor on 1rst character of 2nd line
    lcd.print(airTemp);
     lcd.setCursor(2,1);
    lcd.print((char)223); //special character for temperature
     lcd.print("C");
    lcd.setCursor(6,1);  
    lcd.print(airHumidity);
     lcd.setCursor(8,1); 
    lcd.print("%");
    lcd.setCursor(11,1); 
     lcd.print(valSoil); 
  }
  
}</p><p>int readTempHum (){</p><p>    DHT.read11(dht_apin);   //read value from DHT sensor</p><p>    airTemp = DHT.temperature; //store temperature   value from sensor
    airHumidity = DHT.humidity; // store humidity value from   sensor
    
    //delay(3000);//Wait 3 seconds before accessing sensor again,   without timing, sensor measurement is faulty. we commented this delay because this   function isn't called often
}</p><p>int waterPump(){</p><p>  //the condition   below to command or not the water pump
  if (valSoil</p><p>  //once the waterpump   cycle is launched, this if condition will turn ON the pump on the third of the timePumpPeriod   defined, the other 2 third, the water pump will be turned OFF
  if (currentMillis-timePumpDebut=timePumpPeriod   && pumpOn==true){
      pumpOn=false; //once pump cycle is over, variable value   change to make water spraying dependant on moisture value again
      sprayNum++;   //add +1 to the number of spraying performed
  }
}</p><p>int waterTankAlarm(){
   if (sprayNum>10){ //when number of spraying is above limit, turn on led to warn   user
    digitalWrite(LedPin,HIGH);
  }
  else {
    digitalWrite(LedPin,LOW);
   }
}</p><p>void setup() { 
  // put your setup code here, to run once:
   Serial.begin(9600);
  //defining wich pin are IN or OUT
  pinMode(LedPin,   OUTPUT);      
  pinMode(ButtonOnePin, INPUT); 
  pinMode(ButtonTwoPin, INPUT);   
  pinMode(waterPumpPin, OUTPUT); </p><p>  // initialize the lcd
  lcd.init();                        
  lcd.backlight();
  lcd.setCursor(0,0); 
  lcd.print("Waking   up");</p><p>  //ready first temperature and humidity from DHT sensor to store value   (since this function isn't called often)
  readTempHum();
  
  delay(2000);
   lcd.clear();</p><p>  
}</p><p>void loop() {</p><p>  //reading of sensor value,   not DHT due to the delay needed to its measurement
  readSoil();
  valGaz   = analogRead(gazPin);
  valLight = analogRead(lightPin);</p><p>  currentMillis=millis();   //measurement of current time</p><p>  //small function to avoid button rebound,   when pressing once on the button, arduino reads only one pressing...
  ButtonOneState=digitalRead(ButtonOnePin);   //reading of button value
  if (ButtonOneState !=ButtonOnePreviousState){ //comparing   with previous state
    if (ButtonOneState == HIGH){ //if previous state was   0 and current is 1, then take button pressing in account
      delay(200);
       valToDisplay=1;
      timeBeginDisplay=currentMillis;
    }
    ButtonOnePreviousState=ButtonOneState;
   }
  //same function for button 2 as button 1
  ButtonTwoState=digitalRead(ButtonTwoPin);
   if (ButtonTwoState !=ButtonTwoPreviousState){
    if (ButtonTwoState == HIGH){
       delay(200);
      valToDisplay=2; //particular value for "valToDisplay"
       timeBeginDisplay=currentMillis;
    }
    ButtonTwoPreviousState=ButtonTwoState;
   }
  
  waterPump(); //calling for water pump function which launch spray   cycle if needed</p><p>  waterTankAlarm(); //calling function to warn user about   water tank level</p><p>  //small condition for screen refreshing and measurement   of DHT sensor
  if (currentMillis-debutMillis>timePeriod){ //end of a period
     debutMillis=currentMillis; //define the begining of a new period
    toDisplay();   //refresh of the screen regarding "valToDisplay" value
    humMeasurePeriod++;   //DHT sensor values are measured every 20 times the screens is refreshed
    if   (humMeasurePeriod>20){ //go to measure DHT values
          readTempHum();
           humMeasurePeriod=0;
    }</p><p>  } </p><p>}</p>

Automated gardening kit

c_cpp

1<p>//import the library to control LCD display, this library has been  added manually through ZIP file<br>#include 
2</p><p>//import library for DHT  sensor
3#include "dht.h"
4#define dht_apin A3 // Analog Pin sensor is connected  to</p><p>//create DHT object
5dht DHT;</p><p>// create LCD object
6LiquidCrystal_I2C  lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display</p><p>//declaration  of variable for buttond
7int ButtonOnePin = 10;  //pin for button 1
8int ButtonOneState  =0 ; //one variable to store current button state
9int ButtonOnePreviousState  = 0; //one variable to store previous button state
10int ButtonTwoPin = 9; // same  for button 2
11int ButtonTwoState =0 ;
12int ButtonTwoPreviousState = 0;</p><p>unsigned  long timeBeginDisplay=0;
13int timeDisplayPeriod = 6000; //period the 2nd and 3rd  screen are displayed
14int valToDisplay = 0; //variable to decide what information  is to be displayed</p><p>int airTemp; //variable to store air temperature measured  by DHT11 sensor
15int airHumidity; //variable to store air humidity measured by  DHT11 sensor</p><p>int LedPin =  13; </p><p>int waterPumpPin=7; // pin on which  is connected the relay that command water pump
16int sprayNum=0; //variable to  store number of spraying 
17int pumpOn =false; //variable used for spraying, it  stays ON during the spray timing</p><p>int MoistureHigh = 800; 
18int MoistureGood  = 710;
19int MoistureLow = 630; //threshold that should launch water spray of the  plant
20int valSoil ;  //variable to store value measured by moisture sensor
21int  soilPin = A0; // pin on wich is connected moisture sensor
22int soilPower = 12;</p><p>int  timePeriod = 1000; //variable to store timing in ms, period between each display  refresh, a clear is called each time display is called 
23int humMeasurePeriod=0;  
24unsigned long currentMillis; //variable to store current timing
25unsigned  long debutMillis=0; //variable used to store timing at the debut of a period
26int  timePumpPeriod = 3000; //timing for water spraying
27unsigned long timePumpDebut  = 0; //variable used to store timing value for the debut of a spraying period</p><p>int  gazPin = 1; //pin on which is connected gaz sensor
28int valGaz ; //variable on  which is stored gaz sensor value</p><p>int lightPin = 2; //pin on which is connected  the photoresistor
29int valLight ; //variable on which light value is stored</p><p>//function  to read moisture sensor value
30int readSoil()
31{</p><p>    digitalWrite(soilPower,  HIGH);//turn D7 "On"
32    delay(10);//wait 10 milliseconds 
33    valSoil =  analogRead(soilPin);//Read the SIG value form sensor 
34    digitalWrite(soilPower,  LOW);//turn D7 "Off"
35    return valSoil;//send current moisture value
36}</p><p>//function  called to refresh LCD screen, displaying wanted screen regarding value of variable  "valToDisplay" 
37int toDisplay(){</p><p>  lcd.clear(); //clear the screen to  remove character that might not be overwritten by new message
38  
39  if (valToDisplay==0){
40    lcd.setCursor(0,0); //to put cursor on 1rst character of 1rst line
41    lcd.print("Temp:");
42    lcd.setCursor(6,0);
43    lcd.print("Hum:");
44    lcd.setCursor(11,0);
45    lcd.print("Mois:");
46    lcd.setCursor(0,1); //to put cursor on 1rst character  of 2nd line
47    lcd.print(airTemp);
48    lcd.setCursor(2,1);
49    lcd.print((char)223);  //special character for temperature
50    lcd.print("C");
51    lcd.setCursor(6,1);  
52    lcd.print(airHumidity);
53    lcd.setCursor(8,1); 
54    lcd.print("%");
55    lcd.setCursor(11,1); 
56    lcd.print(valSoil); 
57  }
58  else if (valToDisplay==1  && (currentMillis-timeBeginDisplay)</p><p>  if((currentMillis-timeBeginDisplay)>timeDisplayPeriod){  //display original screen when display period is over
59    valToDisplay=0;
60    //we display in this IF condition the 1rst screen because before there was a  blank screen after the timing
61    lcd.setCursor(0,0); //to put cursor on 1rst  character of 1rst line
62    lcd.print("Temp:");
63    lcd.setCursor(6,0);
64    lcd.print("Hum:");
65    lcd.setCursor(11,0);
66    lcd.print("Mois:");
67    lcd.setCursor(0,1); //to put cursor on 1rst character of 2nd line
68    lcd.print(airTemp);
69    lcd.setCursor(2,1);
70    lcd.print((char)223); //special character for temperature
71    lcd.print("C");
72    lcd.setCursor(6,1);  
73    lcd.print(airHumidity);
74    lcd.setCursor(8,1); 
75    lcd.print("%");
76    lcd.setCursor(11,1); 
77    lcd.print(valSoil); 
78  }
79  
80}</p><p>int readTempHum (){</p><p>    DHT.read11(dht_apin);  //read value from DHT sensor</p><p>    airTemp = DHT.temperature; //store temperature  value from sensor
81    airHumidity = DHT.humidity; // store humidity value from  sensor
82    
83    //delay(3000);//Wait 3 seconds before accessing sensor again,  without timing, sensor measurement is faulty. we commented this delay because this  function isn't called often
84}</p><p>int waterPump(){</p><p>  //the condition  below to command or not the water pump
85  if (valSoil</p><p>  //once the waterpump  cycle is launched, this if condition will turn ON the pump on the third of the timePumpPeriod  defined, the other 2 third, the water pump will be turned OFF
86  if (currentMillis-timePumpDebut=timePumpPeriod  && pumpOn==true){
87      pumpOn=false; //once pump cycle is over, variable value  change to make water spraying dependant on moisture value again
88      sprayNum++;  //add +1 to the number of spraying performed
89  }
90}</p><p>int waterTankAlarm(){
91  if (sprayNum>10){ //when number of spraying is above limit, turn on led to warn  user
92    digitalWrite(LedPin,HIGH);
93  }
94  else {
95    digitalWrite(LedPin,LOW);
96  }
97}</p><p>void setup() { 
98  // put your setup code here, to run once:
99  Serial.begin(9600);
100  //defining wich pin are IN or OUT
101  pinMode(LedPin,  OUTPUT);      
102  pinMode(ButtonOnePin, INPUT); 
103  pinMode(ButtonTwoPin, INPUT);  
104  pinMode(waterPumpPin, OUTPUT); </p><p>  // initialize the lcd
105  lcd.init();                       
106  lcd.backlight();
107  lcd.setCursor(0,0); 
108  lcd.print("Waking  up");</p><p>  //ready first temperature and humidity from DHT sensor to store value  (since this function isn't called often)
109  readTempHum();
110  
111  delay(2000);
112  lcd.clear();</p><p>  
113}</p><p>void loop() {</p><p>  //reading of sensor value,  not DHT due to the delay needed to its measurement
114  readSoil();
115  valGaz  = analogRead(gazPin);
116  valLight = analogRead(lightPin);</p><p>  currentMillis=millis();  //measurement of current time</p><p>  //small function to avoid button rebound,  when pressing once on the button, arduino reads only one pressing...
117  ButtonOneState=digitalRead(ButtonOnePin);  //reading of button value
118  if (ButtonOneState !=ButtonOnePreviousState){ //comparing  with previous state
119    if (ButtonOneState == HIGH){ //if previous state was  0 and current is 1, then take button pressing in account
120      delay(200);
121      valToDisplay=1;
122      timeBeginDisplay=currentMillis;
123    }
124    ButtonOnePreviousState=ButtonOneState;
125  }
126  //same function for button 2 as button 1
127  ButtonTwoState=digitalRead(ButtonTwoPin);
128  if (ButtonTwoState !=ButtonTwoPreviousState){
129    if (ButtonTwoState == HIGH){
130      delay(200);
131      valToDisplay=2; //particular value for "valToDisplay"
132      timeBeginDisplay=currentMillis;
133    }
134    ButtonTwoPreviousState=ButtonTwoState;
135  }
136  
137  waterPump(); //calling for water pump function which launch spray  cycle if needed</p><p>  waterTankAlarm(); //calling function to warn user about  water tank level</p><p>  //small condition for screen refreshing and measurement  of DHT sensor
138  if (currentMillis-debutMillis>timePeriod){ //end of a period
139    debutMillis=currentMillis; //define the begining of a new period
140    toDisplay();  //refresh of the screen regarding "valToDisplay" value
141    humMeasurePeriod++;  //DHT sensor values are measured every 20 times the screens is refreshed
142    if  (humMeasurePeriod>20){ //go to measure DHT values
143          readTempHum();
144          humMeasurePeriod=0;
145    }</p><p>  } </p><p>}</p>

<p>//import the library to control LCD display, this library has been  added manually through ZIP file<br>#include 
</p><p>//import library for DHT  sensor
#include "dht.h"
#define dht_apin A3 // Analog Pin sensor is connected  to</p><p>//create DHT object
dht DHT;</p><p>// create LCD object
LiquidCrystal_I2C  lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display</p><p>//declaration  of variable for buttond
int ButtonOnePin = 10;  //pin for button 1
int ButtonOneState  =0 ; //one variable to store current button state
int ButtonOnePreviousState  = 0; //one variable to store previous button state
int ButtonTwoPin = 9; // same  for button 2
int ButtonTwoState =0 ;
int ButtonTwoPreviousState = 0;</p><p>unsigned  long timeBeginDisplay=0;
int timeDisplayPeriod = 6000; //period the 2nd and 3rd  screen are displayed
int valToDisplay = 0; //variable to decide what information  is to be displayed</p><p>int airTemp; //variable to store air temperature measured  by DHT11 sensor
int airHumidity; //variable to store air humidity measured by  DHT11 sensor</p><p>int LedPin =  13; </p><p>int waterPumpPin=7; // pin on which  is connected the relay that command water pump
int sprayNum=0; //variable to  store number of spraying 
int pumpOn =false; //variable used for spraying, it  stays ON during the spray timing</p><p>int MoistureHigh = 800; 
int MoistureGood  = 710;
int MoistureLow = 630; //threshold that should launch water spray of the  plant
int valSoil ;  //variable to store value measured by moisture sensor
int  soilPin = A0; // pin on wich is connected moisture sensor
int soilPower = 12;</p><p>int  timePeriod = 1000; //variable to store timing in ms, period between each display  refresh, a clear is called each time display is called 
int humMeasurePeriod=0;  
unsigned long currentMillis; //variable to store current timing
unsigned  long debutMillis=0; //variable used to store timing at the debut of a period
int  timePumpPeriod = 3000; //timing for water spraying
unsigned long timePumpDebut  = 0; //variable used to store timing value for the debut of a spraying period</p><p>int  gazPin = 1; //pin on which is connected gaz sensor
int valGaz ; //variable on  which is stored gaz sensor value</p><p>int lightPin = 2; //pin on which is connected  the photoresistor
int valLight ; //variable on which light value is stored</p><p>//function  to read moisture sensor value
int readSoil()
{</p><p>    digitalWrite(soilPower,  HIGH);//turn D7 "On"
    delay(10);//wait 10 milliseconds 
    valSoil =  analogRead(soilPin);//Read the SIG value form sensor 
    digitalWrite(soilPower,  LOW);//turn D7 "Off"
    return valSoil;//send current moisture value
}</p><p>//function  called to refresh LCD screen, displaying wanted screen regarding value of variable  "valToDisplay" 
int toDisplay(){</p><p>  lcd.clear(); //clear the screen to  remove character that might not be overwritten by new message
  
  if (valToDisplay==0){
    lcd.setCursor(0,0); //to put cursor on 1rst character of 1rst line
    lcd.print("Temp:");
    lcd.setCursor(6,0);
    lcd.print("Hum:");
    lcd.setCursor(11,0);
    lcd.print("Mois:");
    lcd.setCursor(0,1); //to put cursor on 1rst character  of 2nd line
    lcd.print(airTemp);
    lcd.setCursor(2,1);
    lcd.print((char)223);  //special character for temperature
    lcd.print("C");
    lcd.setCursor(6,1);  
    lcd.print(airHumidity);
    lcd.setCursor(8,1); 
    lcd.print("%");
    lcd.setCursor(11,1); 
    lcd.print(valSoil); 
  }
  else if (valToDisplay==1  && (currentMillis-timeBeginDisplay)</p><p>  if((currentMillis-timeBeginDisplay)>timeDisplayPeriod){  //display original screen when display period is over
    valToDisplay=0;
    //we display in this IF condition the 1rst screen because before there was a  blank screen after the timing
    lcd.setCursor(0,0); //to put cursor on 1rst  character of 1rst line
    lcd.print("Temp:");
    lcd.setCursor(6,0);
    lcd.print("Hum:");
    lcd.setCursor(11,0);
    lcd.print("Mois:");
    lcd.setCursor(0,1); //to put cursor on 1rst character of 2nd line
    lcd.print(airTemp);
    lcd.setCursor(2,1);
    lcd.print((char)223); //special character for temperature
    lcd.print("C");
    lcd.setCursor(6,1);  
    lcd.print(airHumidity);
    lcd.setCursor(8,1); 
    lcd.print("%");
    lcd.setCursor(11,1); 
    lcd.print(valSoil); 
  }
  
}</p><p>int readTempHum (){</p><p>    DHT.read11(dht_apin);  //read value from DHT sensor</p><p>    airTemp = DHT.temperature; //store temperature  value from sensor
    airHumidity = DHT.humidity; // store humidity value from  sensor
    
    //delay(3000);//Wait 3 seconds before accessing sensor again,  without timing, sensor measurement is faulty. we commented this delay because this  function isn't called often
}</p><p>int waterPump(){</p><p>  //the condition  below to command or not the water pump
  if (valSoil</p><p>  //once the waterpump  cycle is launched, this if condition will turn ON the pump on the third of the timePumpPeriod  defined, the other 2 third, the water pump will be turned OFF
  if (currentMillis-timePumpDebut=timePumpPeriod  && pumpOn==true){
      pumpOn=false; //once pump cycle is over, variable value  change to make water spraying dependant on moisture value again
      sprayNum++;  //add +1 to the number of spraying performed
  }
}</p><p>int waterTankAlarm(){
  if (sprayNum>10){ //when number of spraying is above limit, turn on led to warn  user
    digitalWrite(LedPin,HIGH);
  }
  else {
    digitalWrite(LedPin,LOW);
  }
}</p><p>void setup() { 
  // put your setup code here, to run once:
  Serial.begin(9600);
  //defining wich pin are IN or OUT
  pinMode(LedPin,  OUTPUT);      
  pinMode(ButtonOnePin, INPUT); 
  pinMode(ButtonTwoPin, INPUT);  
  pinMode(waterPumpPin, OUTPUT); </p><p>  // initialize the lcd
  lcd.init();                       
  lcd.backlight();
  lcd.setCursor(0,0); 
  lcd.print("Waking  up");</p><p>  //ready first temperature and humidity from DHT sensor to store value  (since this function isn't called often)
  readTempHum();
  
  delay(2000);
  lcd.clear();</p><p>  
}</p><p>void loop() {</p><p>  //reading of sensor value,  not DHT due to the delay needed to its measurement
  readSoil();
  valGaz  = analogRead(gazPin);
  valLight = analogRead(lightPin);</p><p>  currentMillis=millis();  //measurement of current time</p><p>  //small function to avoid button rebound,  when pressing once on the button, arduino reads only one pressing...
  ButtonOneState=digitalRead(ButtonOnePin);  //reading of button value
  if (ButtonOneState !=ButtonOnePreviousState){ //comparing  with previous state
    if (ButtonOneState == HIGH){ //if previous state was  0 and current is 1, then take button pressing in account
      delay(200);
      valToDisplay=1;
      timeBeginDisplay=currentMillis;
    }
    ButtonOnePreviousState=ButtonOneState;
  }
  //same function for button 2 as button 1
  ButtonTwoState=digitalRead(ButtonTwoPin);
  if (ButtonTwoState !=ButtonTwoPreviousState){
    if (ButtonTwoState == HIGH){
      delay(200);
      valToDisplay=2; //particular value for "valToDisplay"
      timeBeginDisplay=currentMillis;
    }
    ButtonTwoPreviousState=ButtonTwoState;
  }
  
  waterPump(); //calling for water pump function which launch spray  cycle if needed</p><p>  waterTankAlarm(); //calling function to warn user about  water tank level</p><p>  //small condition for screen refreshing and measurement  of DHT sensor
  if (currentMillis-debutMillis>timePeriod){ //end of a period
    debutMillis=currentMillis; //define the begining of a new period
    toDisplay();  //refresh of the screen regarding "valToDisplay" value
    humMeasurePeriod++;  //DHT sensor values are measured every 20 times the screens is refreshed
    if  (humMeasurePeriod>20){ //go to measure DHT values
          readTempHum();
          humMeasurePeriod=0;
    }</p><p>  } </p><p>}</p>

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Automated gardening -Fritzing

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