Maker and IoT Ideas
Published © CC BY-NC-SA

Iot Plant Watering Solution

A Simple IoT Plant Watering solution with a twist - It was built by language major students - with zero previous experience...

BeginnerFull instructions provided4 hours126
Iot Plant Watering Solution

Things used in this project

Hardware components

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Story

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Schematics

Schematic

Code

Code

Arduino
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32


#define DHTTYPE    DHT11     // DHT 11
#define WaterRelay 2
#define A0Enable 14
#define DHTEnable 13
#define DHTPIN 12
#define WATER_DELAY 10000
#define WATER_LOW 20.00
#define SOIL_DELAY 5000

uint32_t delayMS;
float temperature = 0.00;
float humidity = 0.00;
float soilValue = 0.00;
float soilAverage = 0.00;
unsigned long previousMillis = 0;
unsigned long previousWater = 0;
unsigned long previousSoil = 0;
bool MAY_WATER = 0;
bool RUN_WATER = 0;
bool DELAY_WATER = 0;
sensor_t sensor;
const String WaterOn = "Waterpump ON";
const String WaterOff = "Waterpump OFF";
String WaterMessage = "";

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
DHT_Unified dht(DHTPIN, DHTTYPE);



void setup() {
  
  pinMode(WaterRelay,OUTPUT);
  pinMode(A0Enable,OUTPUT);
  pinMode(DHTEnable,OUTPUT);
  digitalWrite(WaterRelay,HIGH);
  //Serial.begin(115200);
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    //Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  display.ssd1306_command(SSD1306_DISPLAYON);
  display.clearDisplay();
  display.display();
  delay(20);
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10,10);
  display.print("Booting...");
  display.display();
  delay(2000);
  
  dht.begin();
  
  show_DHT_Params();
  
}

void loop() {
  
  
  

  //Soil Monitor Loop
  unsigned long SoilMillis = millis();
  if ( SoilMillis - previousSoil >= SOIL_DELAY) {
    previousSoil = SoilMillis;
    take_soil_reading();
  }
  //End Soil Monitor Loop

  //Water Loop
  unsigned long WaterMillis = millis();
  if (WaterMillis - previousWater >= WATER_DELAY) {
    previousWater = WaterMillis;
    if ((digitalRead(WaterRelay) == LOW) && (RUN_WATER == 1) && ( DELAY_WATER == 0)) {
      digitalWrite(WaterRelay,HIGH);
      DELAY_WATER = 1;
    } else if (DELAY_WATER == 1) {
      DELAY_WATER = 0;
      if (RUN_WATER == 1) RUN_WATER = 0;
    }
  }
  // End Water Loop
  // Main One Second Delay Loop
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= delayMS) {
    previousMillis = currentMillis;
    get_DHT_Readings();
    show_Soil_Data();
    display.display();
  }
  // End Main 1 Second Loop
  if ((soilAverage < WATER_LOW) && (RUN_WATER == 0)) {
    RUN_WATER = 1;
    MAY_WATER = 1;
  } else if (soilAverage >= WATER_LOW) {
    RUN_WATER = 0;
    MAY_WATER = 0; 
  }

  if ((digitalRead(WaterRelay) == HIGH) && (RUN_WATER == 1) && DELAY_WATER == 0) {
      digitalWrite(WaterRelay,LOW);
      WaterMessage = WaterOn;
      take_soil_reading();
  }
  if ((DELAY_WATER == 1) && (MAY_WATER == 1)) {
      digitalWrite(WaterRelay,HIGH);
      WaterMessage = WaterOff;
  }
  
}

void take_soil_reading() {
  digitalWrite(A0Enable,HIGH);
  delay(50);
  
  float tempSoil = 0.00;
  for (int i = 0; i <10 ; i++) {
    soilValue = (1024.00 - analogRead(A0));
    tempSoil = tempSoil + soilValue;
    delay(2);
  }
  soilAverage = map(tempSoil/10,0.00,1023.00,0.00,100.00);
  delay(30);
  digitalWrite(A0Enable,LOW);
}

void show_DHT_Params() {
  digitalWrite(DHTEnable,HIGH);
  
  dht.temperature().getSensor(&sensor);
  display.clearDisplay();
  display.display();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10,1);
  display.print("Temperature Sensor");
  display.setCursor(10,10);
  display.print(F("Type: "));
  display.print(sensor.version);
  display.setCursor(10,20);
  display.print(F("Min: "));
  display.print(sensor.min_value);
  display.print(F(" Deg C"));
  display.setCursor(10,30);
  display.print(F("Max: "));
  display.print(sensor.max_value);
  display.print(F(" Deg C"));
  display.setCursor(10,40);
  display.print(F("Resolution: +/- "));
  display.setCursor(10,50);
  display.print(sensor.resolution);
  display.print(F(" Deg C"));
  display.display();
  delay(4000);
  dht.humidity().getSensor(&sensor);
  display.clearDisplay();
  display.display();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10,1);
  display.print("Humidity Sensor");
  display.setCursor(10,10);
  display.print(F("Type: "));
  display.print(sensor.version);
  display.setCursor(10,20);
  display.print(F("Min: "));
  display.print(sensor.min_value);
  display.print(F(" % RH"));
  display.setCursor(10,30);
  display.print(F("Max: "));
  display.print(sensor.max_value);
  display.print(F(" % RH"));
  display.setCursor(10,40);
  display.print(F("Resolution: +/- "));
   display.setCursor(10,50);
  display.print(sensor.resolution);
  display.print(F(" % RH"));
  display.display();
  delay(4000);
  
  delayMS = sensor.min_delay / 1000;
}

void get_DHT_Readings() {
    
    display.clearDisplay();
    display.setTextSize(2);
    display.setTextColor(SSD1306_WHITE);
    sensors_event_t event;
    dht.temperature().getEvent(&event);
    if (isnan(event.temperature)) {
      #ifdef DEBUG-SERIAL
      Serial.println(F("Error reading temperature!"));
      #endif
    }
    else {
      display.setCursor(10,1);
     
      display.setCursor(10,1);
      display.print(event.temperature);
      display.setCursor(80,1);
      display.println(F(" C"));
      temperature = event.temperature;
    }
    // Get humidity event and print its value.
    dht.humidity().getEvent(&event);
    if (isnan(event.relative_humidity)) {
     display.clearDisplay();
    display.setTextSize(2);
    display.setTextColor(SSD1306_WHITE);
    sensors_event_t event;
    dht.temperature().getEvent(&event);
    if (isnan(event.temperature)) {
      #ifdef DEBUG-SERIAL
      Serial.println(F("Error reading temperature!"));
      #endif
    }
    else {
      
      display.setCursor(10,1);
      display.print(event.temperature);
      display.setCursor(80,1);
      display.println(F(" C"));
      temperature = event.temperature;
    }
    // Get humidity event and print its value.
    dht.humidity().getEvent(&event);
    if (isnan(event.relative_humidity)) {
      #ifdef DEBUG-SERIAL
      Serial.println(F("Error reading humidity!"));
      #endif
    }
    else {
      display.setCursor(10,20);
      display.print(event.relative_humidity);
      display.setCursor(80,20);
      display.println(F(" %"));
      humidity = event.relative_humidity;
    }
    }
    else {
      display.setCursor(10,20);
      display.print(event.relative_humidity);
      display.setCursor(80,20);
      display.println(F(" %RH"));
      humidity = event.relative_humidity;
    }
    
}

void show_Soil_Data() {
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10,39);
  display.print(soilAverage);
  display.setCursor(80,39);
  display.println(F(" %"));
  display.setTextSize(1);
  display.setCursor(10,56);
  display.println(WaterMessage);
}

Credits

Maker and IoT Ideas
97 projects • 26 followers
I design custom PCB solutions, usually with an IoT or Automation twist, to solve problems in my daily life. Sometimes also for other people.

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Related channels and tags
  • Internet of Things
  • Internet of Things
  • PCBWay