This project creates a smart plant watering system that reminds you to water your plants when motion is detected nearby, or automatically waters based on soil moisture. It is perfect for indoor plants that are easily forgotten.<\/p>\n
Difficulty:<\/strong> Beginner\/Intermediate A PIR sensor detects when someone approaches the plant. When motion is detected, a soil moisture sensor checks if watering is needed. If the soil is dry, a water pump is activated for a set duration. An LCD or LED indicates the plant’s status. Optionally, the system can water automatically on a schedule regardless of motion.<\/p>\n VCC<\/th>\n 5V<\/th>\n GND<\/th>\n GND<\/th>\n OUT<\/th>\n Digital Pin 2<\/th>\n VCC<\/th>\n 5V<\/th>\n GND<\/th>\n GND<\/th>\n AO<\/th>\n Analog Pin A0<\/th>\n IN<\/th>\n Digital Pin 3<\/th>\n SDA<\/th>\n A4<\/th>\n SCL<\/th>\n A5<\/th>\n Positive<\/th>\n Digital Pin 8<\/th>\n Anode<\/th>\n Digital Pin 13 (via 220\u03a9)<\/th>\n<\/tbody>\n \u8868<\/p>\n This smart plant watering system takes the guesswork out of plant care. It reminds you to water when you are near the plant and only waters when needed, preventing both under-watering and over-watering.<\/p>\n","protected":false},"excerpt":{"rendered":" Project Overview This project creates a smart plant watering system that reminds you to water your plants when motion is detected nearby, or automatically waters based on soil moisture. It is perfect for indoor plants that are easily forgotten. Difficulty: Beginner\/Intermediate Estimated time: 2-3 hours Estimated cost: $20-30 How It Works A PIR sensor detects […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-4047","post","type-post","status-publish","format-standard","hentry","category-projects"],"blocksy_meta":[],"yoast_head":"\r\n
\nEstimated time:<\/strong> 2-3 hours
\nEstimated cost:<\/strong> $20-30<\/p>\nHow It Works<\/h2>\n
Materials Needed<\/h2>\n
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Circuit Diagram<\/h2>\n
Connection Table<\/h3>\n
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Component<\/th>\n Pin<\/th>\n Arduino Pin<\/th>\n<\/thead>\n \nPIR Sensor<\/th>\n PIR Sensor<\/th>\n PIR Sensor<\/th>\n Soil Moisture Sensor<\/th>\n Soil Moisture Sensor<\/th>\n Soil Moisture Sensor<\/th>\n Relay Module<\/th>\n LCD I2C<\/th>\n LCD I2C<\/th>\n Buzzer<\/th>\n Status LED<\/th>\n Arduino Code<\/h2>\n
#include <Wire.h>\n#include <LiquidCrystal_I2C.h>\n\nLiquidCrystal_I2C lcd(0x27, 16, 2);\n\nconst int pirPin = 2;\nconst int pumpPin = 3;\nconst int moisturePin = A0;\nconst int buzzerPin = 8;\nconst int ledPin = 13;\n\nconst int dryThreshold = 500;\nconst int wetThreshold = 800;\n\nunsigned long lastMotionTime = 0;\nconst unsigned long cooldownPeriod = 3600000;\nbool wateredRecently = false;\n\nvoid setup() {\n Serial.begin(9600);\n \n pinMode(pirPin, INPUT);\n pinMode(pumpPin, OUTPUT);\n pinMode(buzzerPin, OUTPUT);\n pinMode(ledPin, OUTPUT);\n \n digitalWrite(pumpPin, LOW);\n digitalWrite(ledPin, LOW);\n \n lcd.init();\n lcd.backlight();\n lcd.print(\"Plant Watering\");\n lcd.setCursor(0, 1);\n lcd.print(\"System Ready\");\n \n delay(60000);\n}\n\nint readMoisture() {\n int value = analogRead(moisturePin);\n return value;\n}\n\nbool needsWater() {\n int moisture = readMoisture();\n return moisture < dryThreshold;\n}\n\nvoid waterPlant() {\n digitalWrite(buzzerPin, HIGH);\n delay(200);\n digitalWrite(buzzerPin, LOW);\n \n digitalWrite(pumpPin, HIGH);\n digitalWrite(ledPin, HIGH);\n delay(5000);\n digitalWrite(pumpPin, LOW);\n digitalWrite(ledPin, LOW);\n \n digitalWrite(buzzerPin, HIGH);\n delay(200);\n digitalWrite(buzzerPin, LOW);\n delay(200);\n digitalWrite(buzzerPin, HIGH);\n delay(200);\n digitalWrite(buzzerPin, LOW);\n \n wateredRecently = true;\n lastMotionTime = millis();\n}\n\nvoid checkAndWater() {\n if (needsWater()) {\n if (!wateredRecently || (millis() - lastMotionTime > cooldownPeriod)) {\n waterPlant();\n } else {\n digitalWrite(buzzerPin, HIGH);\n delay(100);\n digitalWrite(buzzerPin, LOW);\n delay(100);\n }\n }\n}\n\nvoid displayStatus() {\n int moisture = readMoisture();\n lcd.clear();\n lcd.setCursor(0, 0);\n lcd.print(\"Moisture: \");\n lcd.print(moisture);\n lcd.setCursor(0, 1);\n if (moisture < dryThreshold) {\n lcd.print(\"DRY - Water soon\");\n } else if (moisture < wetThreshold) {\n lcd.print(\"OK\");\n } else {\n lcd.print(\"WET\");\n }\n}\n\nvoid loop() {\n bool motionDetected = digitalRead(pirPin) == HIGH;\n \n if (motionDetected) {\n digitalWrite(ledPin, HIGH);\n delay(500);\n digitalWrite(ledPin, LOW);\n checkAndWater();\n } else {\n static unsigned long lastDisplay = 0;\n if (millis() - lastDisplay > 10000) {\n displayStatus();\n lastDisplay = millis();\n }\n }\n \n delay(100);\n}\n<\/code><\/pre>\nInstallation Steps<\/h2>\n
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Project Extensions<\/h2>\n
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Conclusion<\/h2>\n