Smart Green House Monitoring System

Summary

The Smart Green House Monitoring System is designed to automate and monitor various environmental parameters within a greenhouse. The system uses an ESP32 microcontroller to read data from sensors, control actuators, and communicate with a cloud service for remote monitoring and control. The system includes sensors for humidity, temperature, and soil moisture, as well as actuators like a water pump, fan, and buzzer. The system is powered by a 5V battery and uses relays to control the actuators.

Component List

Humidity YL-69

• Pins: A0, D0, GND, VCC
• Description: Measures soil moisture levels.
• Purpose in Circuit: Provides soil moisture data to the ESP32.

5V Mini Water Pump

• Pins: Positive pin, Negative pin
• Description: Pumps water to the plants.
• Purpose in Circuit: Controlled by a relay to water the plants based on soil moisture levels.

Fan

• Pins: GND, 5V
• Description: Provides ventilation.
• Purpose in Circuit: Controlled by a relay to regulate temperature.

5V Battery

• Pins: Positive, Negative
• Description: Provides power to the circuit.
• Purpose in Circuit: Main power source for the system.

ESP32 (30 pin)

• Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3
• Description: Microcontroller.
• Purpose in Circuit: Central control unit for reading sensors, controlling actuators, and communicating with the cloud.

DHT22

• Pins: +, Out, -
• Description: Measures temperature and humidity.
• Purpose in Circuit: Provides temperature and humidity data to the ESP32.

PIR/Motion Sensor

• Pins: GND, OUTPUT, VCC
• Description: Detects motion.
• Purpose in Circuit: Provides motion detection data to the ESP32.

Peltier Module

• Pins: Negative, Positive
• Description: Provides heating or cooling.
• Purpose in Circuit: Controlled by the ESP32 for temperature regulation.

5V Relay

• Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC
• Description: Switches high-power devices.
• Purpose in Circuit: Controls the water pump and fan.

Buzzer

• Pins: PIN, GND
• Description: Provides audible alerts.
• Purpose in Circuit: Controlled by the ESP32 for notifications.

Wiring Details

Humidity YL-69

• VCC to 5V Battery Positive
• GND to ESP32 GND
• D0 to ESP32 D34

5V Mini Water Pump

• Positive pin to 5V Relay Common terminal
• Negative pin to 5V Relay Normally Open

Fan

• 5V to 5V Relay Common terminal
• GND to 5V Relay Normally Open

5V Battery

• Positive to ESP32 Vin
• Negative to ESP32 GND

ESP32 (30 pin)

• Vin to 5V Battery Positive
• GND to 5V Battery Negative
• D34 to Humidity YL-69 D0
• D32 to PIR/Motion Sensor OUTPUT
• D33 to 5V Relay In
• D25 to Buzzer PIN
• D27 to 5V Relay In
• D15 to DHT22 Out

DHT22

• + to 5V Battery Positive
• - to ESP32 GND
• Out to ESP32 D15

PIR/Motion Sensor

• VCC to 5V Battery Positive
• GND to ESP32 GND
• OUTPUT to ESP32 D32

Peltier Module

• Positive to 5V Battery Positive
• Negative to ESP32 GND

5V Relay

• VCC to 5V Battery Positive
• GND to ESP32 GND
• In to ESP32 D33
• Common terminal to 5V Mini Water Pump Positive pin
• Normally Open to 5V Mini Water Pump Negative pin

Buzzer

• PIN to ESP32 D25
• GND to ESP32 GND

Documented Code

#define BLYNK_TEMPLATE_ID "TMPL6o0woVv00"
#define BLYNK_TEMPLATE_NAME "Smart Green House Monitoring System"
#define BLYNK_AUTH_TOKEN "AToqA3zayEOBl25VyE-lmPJIqbo1qABA"

#include <DHT.h>                  // Include the DHT library
#include <BlynkSimpleEsp32.h>    // Include the Blynk library
#include <WiFi.h>                // Include the WiFi library
#include <FirebaseESP32.h>       // Include Firebase library

// Firebase credentials
#define FIREBASE_HOST "smartgreenhouseprojectgroup05-default-rtdb.asia-southeast1.firebasedatabase.app"
#define FIREBASE_AUTH "ekbPCRO9qRZ8GBJI72HzHPoVKRRaf4E9i4IGVwwp" // Use your actual database secret

// Your Wi-Fi credentials
const char* ssid = "Maleesha";       // Replace with your Wi-Fi SSID
const char* password = "03022001";  // Replace with your Wi-Fi password

#define DHTPIN 5                    // DHT11 sensor connected to pin D5
#define DHTTYPE DHT11               // DHT 11 type
#define SOIL_MOISTURE_PIN 35        // Soil moisture sensor connected to pin D35
#define RELAY_PIN 15                // Relay is connected to pin D15
#define FAN_PIN 32                  // Fan is connected to pin D32

DHT dht(DHTPIN, DHTTYPE);             // Create a DHT object

int soilMoistureValue = 0;
const int soilMoistureThreshold = 2500;  // Threshold for dry soil (adjust as needed)
String waterPumpState = "OFF";             // Variable to track water pump state
String fanState = "OFF";                   // Variable to track fan state
const float fanTemperatureThreshold = 27.0; // Fan activation temperature threshold

// Firebase and Blynk data
FirebaseData firebaseData; // Firebase object
FirebaseConfig config;     // Firebase configuration
FirebaseAuth auth;         // Firebase authentication object

void setup() {
    // Initialize the serial monitor for debugging
    Serial.begin(115200);
    
    // Set pin modes
    pinMode(SOIL_MOISTURE_PIN, INPUT);
    pinMode(RELAY_PIN, OUTPUT);
    pinMode(FAN_PIN, OUTPUT);

    // Initially turn off relay and fan
    digitalWrite(RELAY_PIN, HIGH);  // HIGH turns OFF the pump
    digitalWrite(FAN_PIN, HIGH);     // HIGH turns OFF the fan

    // Initialize DHT sensor
    dht.begin();

    // Initialize Blynk with Wi-Fi credentials
    Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);

    // Initialize Firebase
    config.host = FIREBASE_HOST;
    config.signer.tokens.legacy_token = FIREBASE_AUTH;
    
    Firebase.begin(&config, &auth);   // Initialize Firebase with config and auth
    Firebase.reconnectWiFi(true);     // Reconnect Wi-Fi if disconnected

    Serial.println("System Initialized - Water pump OFF, Fan OFF");
}

void loop() {
    // Read the soil moisture level
    soilMoistureValue = analogRead(SOIL_MOISTURE_PIN);
    Serial.print("Soil Moisture Value: ");
    Serial.println(soilMoistureValue);

    // Control the water pump based on soil moisture
    if (soilMoistureValue > soilMoistureThreshold) {
        digitalWrite(RELAY_PIN, LOW);  // Turn ON the pump
        waterPumpState = "ON";
        Serial.println("Soil is dry, turning water pump ON");
        Blynk.virtualWrite(V3, 255);   // Update virtual LED on V3
    } else {
        digitalWrite(RELAY_PIN, HIGH);  // Turn OFF the pump
        waterPumpState = "OFF";
        Serial.println("Soil is moist, turning water pump OFF");
        Blynk.virtualWrite(V3, 0);      // Update virtual LED on V3
    }

    // Read humidity and temperature from the DHT sensor
    float humidity = dht.readHumidity();
    float temperature = dht.readTemperature();

    // Check for valid readings
    if (isnan(humidity) || isnan(temperature)) {
        Serial.println("Failed to