#include #include #include #include #define DHT_PIN 2 #define DHT_TYPE DHT11 #define MODE_BUTTON 4 #define WATER_BUTTON 5 #define PUMP_PIN 8 #define BUZZER_PIN 9 #define SCREEN_WIDTH 128 #define SCREEN_HEIGHT 64 Adafruit_SSD1306 display( SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1 ); DHT dht(DHT_PIN, DHT_TYPE); bool RELAY_ACTIVE_HIGH = true; unsigned long wateringDuration = 5000; const unsigned long MAX_PUMP_TIME = 10000; unsigned long wateringInterval = 21600000UL; unsigned long lastWateringTime = 0; unsigned long pumpStartTime = 0; bool pumpRunning = false; bool manualWatering = false; int screen = 0; void setup() { Serial.begin(9600); pinMode( MODE_BUTTON, INPUT_PULLUP ); pinMode( WATER_BUTTON, INPUT_PULLUP ); pinMode( PUMP_PIN, OUTPUT ); pinMode( BUZZER_PIN, OUTPUT ); pumpOff(); digitalWrite( BUZZER_PIN, LOW ); dht.begin(); if (!display.begin( SSD1306_SWITCHCAPVCC, 0x3C )) { Serial.println( "OLED ERROR" ); while (true); } display.clearDisplay(); display.setTextColor( SSD1306_WHITE ); display.setTextSize(2); display.setCursor(5, 5); display.println("SMART"); display.setCursor(5, 30); display.println("PLANT X"); display.display(); delay(2000); beep(); display.clearDisplay(); display.display(); lastWateringTime = millis(); Serial.println( "SMART PLANT X STARTED" ); } void loop() { float temperature = dht.readTemperature(); float humidity = dht.readHumidity(); checkButtons( temperature, humidity ); smartWatering( temperature, humidity ); pumpSafety(); updateDisplay( temperature, humidity ); printData( temperature, humidity ); delay(200); } void checkButtons( float temperature, float humidity ) { if ( buttonPressed( MODE_BUTTON ) ) { beep(); screen++; if (screen > 2) { screen = 0; } delay(250); } if ( buttonPressed( WATER_BUTTON ) ) { beep(); manualWater(); delay(250); } } bool buttonPressed( int pin ) { if ( digitalRead(pin) == LOW ) { delay(30); if ( digitalRead(pin) == LOW ) { while ( digitalRead(pin) == LOW ) { delay(5); } return true; } } return false; } void smartWatering( float temperature, float humidity ) { if (pumpRunning) { return; } if (isnan(temperature) || isnan(humidity)) { return; } if ( temperature >= 30 && humidity < 45 ) { wateringInterval = 14400000UL; } else if ( temperature >= 25 && humidity < 65 ) { wateringInterval = 21600000UL; } else { wateringInterval = 28800000UL; } if ( millis() - lastWateringTime >= wateringInterval ) { Serial.println( "SMART WATERING STARTED" ); startPump(false); } } void manualWater() { if (pumpRunning) { return; } showMessage( "MANUAL WATER", "PUMP ON" ); startPump(true); unsigned long start = millis(); while ( millis() - start < wateringDuration ) { pumpSafety(); if (!pumpRunning) { break; } delay(50); } if (pumpRunning) { stopPump(); } showMessage( "WATERING", "COMPLETE" ); beep(); delay(1000); } void startPump( bool manual ) { if ( RELAY_ACTIVE_HIGH ) { digitalWrite( PUMP_PIN, HIGH ); } else { digitalWrite( PUMP_PIN, LOW ); } pumpRunning = true; manualWatering = manual; pumpStartTime = millis(); lastWateringTime = millis(); Serial.println( "PUMP ON" ); } void stopPump() { if ( RELAY_ACTIVE_HIGH ) { digitalWrite( PUMP_PIN, LOW ); } else { digitalWrite( PUMP_PIN, HIGH ); } pumpRunning = false; manualWatering = false; Serial.println( "PUMP OFF" ); } void pumpSafety() { if (!pumpRunning) { return; } if ( millis() - pumpStartTime >= MAX_PUMP_TIME ) { Serial.println( "PUMP SAFETY TIMEOUT" ); stopPump(); showMessage( "PUMP SAFETY", "TIMEOUT" ); beep(); delay(1000); } } void updateDisplay( float temperature, float humidity ) { display.clearDisplay(); display.setTextColor( SSD1306_WHITE ); if (screen == 0) { display.setTextSize(1); display.setCursor(0, 0); display.println( "SMART PLANT X" ); display.drawLine( 0, 10, 127, 10, SSD1306_WHITE ); display.setCursor(0, 16); display.print( "TEMP: " ); if (isnan(temperature)) { display.println( "ERROR" ); } else { display.print( temperature, 1 ); display.println( " C" ); } display.setCursor(0, 28); display.print( "HUM: " ); if (isnan(humidity)) { display.println( "ERROR" ); } else { display.print( humidity, 0 ); display.println( "%" ); } display.setCursor(0, 42); display.print( "PUMP: " ); display.println( pumpRunning ? "ON" : "OFF" ); display.setCursor(0, 55); display.println( "MODE=SCREEN" ); } else if (screen == 1) { display.setTextSize(1); display.setCursor(0, 0); display.println( "SMART STATUS" ); display.drawLine( 0, 10, 127, 10, SSD1306_WHITE ); display.setCursor(0, 16); display.print( "TEMP: " ); display.print( temperature, 1 ); display.println( " C" ); display.setCursor(0, 28); display.print( "HUM: " ); display.print( humidity, 0 ); display.println( "%" ); display.setCursor(0, 40); display.print( "INTERVAL: " ); display.print( wateringInterval / 3600000UL ); display.println( " H" ); display.setCursor(0, 52); if ( temperature >= 30 && humidity < 45 ) { display.println( "HOT / DRY" ); } else if ( temperature >= 25 && humidity < 65 ) { display.println( "NORMAL" ); } else { display.println( "COOL / HUMID" ); } } else if (screen == 2) { unsigned long elapsed = millis() - lastWateringTime; unsigned long remaining = 0; if ( elapsed < wateringInterval ) { remaining = wateringInterval - elapsed; } unsigned long hours = remaining / 3600000UL; unsigned long minutes = (remaining % 3600000UL) / 60000UL; display.setTextSize(1); display.setCursor(0, 0); display.println( "NEXT WATERING" ); display.drawLine( 0, 10, 127, 10, SSD1306_WHITE ); display.setTextSize(2); display.setCursor(10, 20); display.print( hours ); display.print( "H " ); display.print( minutes ); display.println( "M" ); display.setTextSize(1); display.setCursor(0, 48); display.print( "DURATION: " ); display.print( wateringDuration / 1000 ); display.println( " SEC" ); } display.display(); } void showMessage( const char* line1, const char* line2 ) { display.clearDisplay(); display.setTextColor( SSD1306_WHITE ); display.setTextSize(1); display.setCursor( 10, 15 ); display.println( line1 ); display.setCursor( 10, 35 ); display.println( line2 ); display.display(); } void beep() { digitalWrite( BUZZER_PIN, HIGH ); delay(80); digitalWrite( BUZZER_PIN, LOW ); } void pumpOff() { if ( RELAY_ACTIVE_HIGH ) { digitalWrite( PUMP_PIN, LOW ); } else { digitalWrite( PUMP_PIN, HIGH ); } pumpRunning = false; } void printData( float temperature, float humidity ) { static unsigned long lastPrint = 0; if ( millis() - lastPrint < 3000 ) { return; } lastPrint = millis(); Serial.println( "------------------------" ); Serial.print( "Temperature: " ); Serial.print( temperature ); Serial.println( " C" ); Serial.print( "Humidity: " ); Serial.print( humidity ); Serial.println( "%" ); Serial.print( "Watering Interval: " ); Serial.print( wateringInterval / 3600000UL ); Serial.println( " hours" ); Serial.print( "Pump: " ); Serial.println( pumpRunning ? "ON" : "OFF" ); }