ESP32 Smart Plant Watering System

/*********************************************************************
 * ESP32 Smart Plant Watering System
 * 
 * Monitors soil moisture and waters plants automatically
 * Hardware: ESP32, Capacitive Soil Sensor, 5V Pump, Relay
 *********************************************************************/

#include 
#include 

// ============== CONFIGURATION ==============
#define BLYNK_AUTH "YOUR_AUTH_TOKEN"

const char* wifi_ssid = "YOUR_WIFI";
const char* wifi_password = "YOUR_PASSWORD";

// ============== PINS ==============
#define SOIL_SENSOR_PIN 34    // ADC pin
#define PUMP_RELAY_PIN 26      // GPIO 26
#define MOISTURE_THRESHOLD 40  // Dry when below 40%

// ============== TIMING ==============
#define CHECK_INTERVAL 60000   // Check every 60 seconds
#define PUMP_DURATION 5000     // Water for 5 seconds
#define DRYING_PERIOD 3600000  // Wait 1 hour after watering

unsigned long lastCheck = 0;
unsigned long pumpStartTime = 0;
bool isWatering = false;
unsigned long dryingEndTime = 0;

// ============== SETUP ==============
void setup() {
  Serial.begin(115200);
  Serial.println(F("\n======================================"));
  Serial.println(F("Smart Plant Watering System Starting..."));
  Serial.println(F("======================================"));
  
  pinMode(SOIL_SENSOR_PIN, INPUT);
  pinMode(PUMP_RELAY_PIN, OUTPUT);
  digitalWrite(PUMP_RELAY_PIN, HIGH);  // Pump OFF
  
  analogReadResolution(12);
  
  connectToWiFi();
  Blynk.begin(BLYNK_AUTH, wifi_ssid, wifi_password);
  
  Serial.println(F("Setup complete!"));
}

// ============== MAIN LOOP ==============
void loop() {
  Blynk.run();
  
  if (millis() - lastCheck > CHECK_INTERVAL) {
    lastCheck = millis();
    checkMoisture();
  }
  
  // Check if watering period is over
  if (isWatering && millis() - pumpStartTime > PUMP_DURATION) {
    stopWatering();
  }
  
  // Check if drying period is over
  if (dryingEndTime > 0 && millis() > dryingEndTime) {
    dryingEndTime = 0;
    Serial.println(F("Drying period complete. Ready to check again."));
  }
}

// ============== FUNCTIONS ==============

void checkMoisture() {
  if (dryingEndTime > 0) {
    return;  // Still in drying period
  }
  
  int moisture = analogRead(SOIL_SENSOR_PIN);
  int moisturePercent = map(moisture, 0, 4095, 100, 0);
  
  Serial.print(F("Moisture: "));
  Serial.print(moisturePercent);
  Serial.print(F("% (Raw: "));
  Serial.print(moisture);
  Serial.println(F(")"));
  
  Blynk.virtualWrite(V0, moisturePercent);
  
  if (moisturePercent < MOISTURE_THRESHOLD && !isWatering) {
    Serial.println(F("Soil is dry! Starting pump..."));
    startWatering();
  }
}

void startWatering() {
  isWatering = true;
  pumpStartTime = millis();
  digitalWrite(PUMP_RELAY_PIN, LOW);  // Pump ON
  Blynk.virtualWrite(V1, 1);
  Serial.println(F("Pump ON"));
}

void stopWatering() {
  isWatering = false;
  digitalWrite(PUMP_RELAY_PIN, HIGH);  // Pump OFF
  dryingEndTime = millis() + DRYING_PERIOD;
  Blynk.virtualWrite(V1, 0);
  Serial.println(F("Pump OFF. Entering drying period..."));
}

void connectToWiFi() {
  Serial.print(F("Connecting to WiFi"));
  WiFi.begin(wifi_ssid, wifi_password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(F("."));
  }
  Serial.println(F(" Connected!"));
}

// ============== END OF CODE ==============