Plant Watering Machine

ArduinoWaterPump.ino

#include <SimpleDHT.h>

#define readingInterval 1000    // change this later
#define readingLimit 10         // change later


int pinMoistureSensor1 = A0;
int pinMoistureSensor2 = A1;
int pinPump = 7;
int pinDHT22 = 6;

int readingSum1 = 0;
int readingSum2 = 0;
int readingCount = 0;
unsigned long previousTime = 0;

SimpleDHT22 dht22;

void setup() {
  pinMode(pinPump, OUTPUT);
  pinMode(pinDHT22, INPUT);

  digitalWrite(pinPump, HIGH);

  Serial.begin(9600);
}

void loop() {

  unsigned long currentTime = millis();

  float temperature = 0;
  float humidity = 0;
  int err = SimpleDHTErrSuccess;
  if ((err = dht22.read2(pinDHT22, &temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
    Serial.print("Read DHT22 failed, err="); Serial.println(err);delay(2000);
    return;
  }

  Serial.print("Current temperature: ");
  Serial.println(temperature);

  Serial.print("Current humidity: ");
  Serial.println(humidity);

  Serial.print("Current time: ");
  Serial.println(currentTime);

  if(currentTime - previousTime > readingInterval) {
    previousTime = currentTime;

    Serial.print("Current time changed to: ");
    Serial.println(previousTime);

    readingSum1 += analogRead(pinMoistureSensor1);
    readingSum2 += analogRead(pinMoistureSensor2);

    readingCount++;

    if(readingCount >= readingLimit) {
      int averageMoisture1 = ceil(readingSum1 / readingCount);
      int averageMoisture2 = ceil(readingSum2 / readingCount);

      Serial.print("Moisture 1: ");
      Serial.println(averageMoisture1);

      Serial.print("Moisture 2: ");
      Serial.println(averageMoisture2);

      // Dry: (520 430]
      // Wet: (430 350]
      // Water: (350 260]

      if (averageMoisture1 > 500 || averageMoisture2 > 500) {
        digitalWrite(pinPump, LOW);
        Serial.println("Punping water!");
        delay(5000);
        digitalWrite(pinPump, HIGH);
      }
      
      readingSum1 = 0;
      readingSum2 = 0;
      readingCount = 0;    
    } 
  }

  delay(500);
}