Smart Humidifier using DHT11 and Ultrasonic Water Atomizer Module

1#include <Adafruit_Sensor.h>
2#include "dht.h"
3#include "Wire.h" // Library for I2C communication
4#include "LiquidCrystal_I2C.h" // Library for LCD
5dht DHT;
6
7const int supplyPin = 8;
8int potPin = A0;
9int waterSensor = A1;
10int lcDelayPin = A2;
11#define DHT11_PIN 7   //Setting Up Pin 7 as the DHT Sensor input, based on DHT sensor conventions
12
13LiquidCrystal_I2C mylcd = LiquidCrystal_I2C(0x27, 16, 2); //Defining the LCD Display
14
15void setup(){
16  mylcd.init();               //Initiate LCD
17  mylcd.backlight();          //Turn on Backlight
18  pinMode(supplyPin,OUTPUT);  //Pin 8 is output pin
19  pinMode(potPin,INPUT);      //Pin A0 is Input 
20  pinMode(waterSensor,INPUT); //Pin A1 is Input
21}
22//Line 23 - 43 are user defined functions
23
24int potIn(int x){         //Return potentiometer value as a % humidity
25  int result;
26  result = 0.06884*analogRead(x)+ 10; // The Lowest value 10%, Heighest is 80%
27  return result;
28}
29
30int waterlevel(){       //If the water level is below a certain threshold, it stops everything
31    while(analogRead(waterSensor)< 150){
32    digitalWrite(supplyPin,LOW);
33    mylcd.clear();
34    mylcd.setCursor(0,0);
35    mylcd.print("Low Water");
36    delay(2000);
37  }
38}
39
40int lcDelay_function(int x){// Return Value from LC Network as Voltage Value, making sure 25 seconds have passed.
41  int result;
42  result = 0.0049*analogRead(x)+0.0174;
43  return result;
44}
45
46
47void loop(){
48  
49  waterlevel();                   //Check Water Level
50  while(lcDelay_function(lcDelayPin)<4){//Check RC delay
51 
52    delay(1000);
53  }
54  
55  int chk = DHT.read11(DHT11_PIN);// Read Value of the DHT Sensor
56  mylcd.setCursor(0, 0);
57  mylcd.print("Humidity ");
58  mylcd.print(DHT.humidity);
59
60  mylcd.setCursor(0,1);
61  mylcd.print("Target =");
62  mylcd.print(potIn(potPin));
63  
64  if (DHT.humidity < potIn(potPin)){ //if DHT value is less than Pot Value, turn on humidifier
65    digitalWrite(supplyPin,HIGH);
66  }else{
67    digitalWrite(supplyPin,LOW);
68  }
69
70
71  delay(1000);
72}