Arduino based controlled garden irrigation with submersible pump.

The aim of this application is to keep the garden plants alive, when we are on vacation.

This uses Arduino UNO to control the submersible pump, based on the timings and additional parameters like water level in the tank as a protection to the submersible pump.

Equipment inventory

Submersible Pump	1	Used in small water fountains or aquariums
Arduino UNO	1	The main microcontroller
Single channel Relay	1	To control the current through solenoid
DTH 11	1	Temperature& humidity  measurement
Water level sensors	1	To detect the water level as an additional check for protecting the pump
Power supplies 1.       5V for Arduino 2.       220V for Pump 3.       Optionally 12V for relay	1 1 1
Drip irrigation water feeder tube		Length varies according to the number of plants / pots to be irrigated
Plumbing accessories		To connect the drip irrigation system to main water inlet.

Arduino library

1)      Time Library (http://www.pjrc.com/teensy/td_libs_Time.html)

2)      Time Alarms Library(http://www.pjrc.com/teensy/td_libs_TimeAlarms.html)

3)      DHT11 Library(http://playground.arduino.cc/Main/DHT11Lib)

Connection block diagram

Arduino Code

#include <Time.h> #include <TimeAlarms.h> #include <dht.h> int pin = 10; int pin2 = 13; int levelOut = 8; int levelIn = 9; dht DHT; #define dht_dpin A0; //#define relay 5; //#define relay 12; int relay = 5; void setOn(){   if(relay == 5) {     digitalWrite(pin,LOW);   digitalWrite(pin2,HIGH);    }   else   digitalWrite(pin,HIGH);     digitalWrite(pin2,LOW);   } void setOff(){   if(relay == 5) {     digitalWrite(pin,HIGH);   digitalWrite(pin2,LOW);       }   else   digitalWrite(pin,LOW);    digitalWrite(pin2,HIGH);   } void setup() {   pinMode(pin, OUTPUT);   pinMode(pin2, OUTPUT);   pinMode(levelOut, OUTPUT);   pinMode(levelIn, INPUT);   //digitalWrite(pin,LOW);   setOff();   //digitalWrite(pin2,LOW); // don't want the LED on pin 13 glowing   Serial.begin(9600);   setTime(22,37,00,27,9,2015); // set the date time of your Arduino     Alarm.alarmRepeat(6,0,0, EarlyMorning); // 6:00am every day   Alarm.timerRepeat(60, Hourly);  // timer for every 2 hours     Serial.println(""); } void loop() {   Alarm.delay(1000); // wait one second between clock display } void EarlyMorning(){   // first thing in the morning open Pump for 2 mins   Serial.println("Early morning");   Pump(2); } void Pump(int min) {   //digitalWrite(pin,HIGH); // Open Pump   if(ChkLevel()){   setOn();   delay(min * 6 * 1000);   //delay(min * 60 * 1000);   //digitalWrite(pin,LOW); // shut Pump   setOff();    } } void Hourly() {   Serial.println("Hourly");   // check during daytime only   if( hour() >= 8 && hour() <= 17 && ChkTemp())       Pump(1); } int relay = 5; void setOn(){   if(relay == 5) {     digitalWrite(pin,LOW);   digitalWrite(pin2,HIGH);    }   else   digitalWrite(pin,HIGH);     digitalWrite(pin2,LOW);   } void setOff(){   if(relay == 5) {     digitalWrite(pin,HIGH);   digitalWrite(pin2,LOW);       }   else   digitalWrite(pin,LOW);    digitalWrite(pin2,HIGH);   } bool ChkTemp() {   DHT.read11(A0);   // if temp > 30 and humidity > 75%   return (DHT.temperature >= 30 || DHT.humidity >= 75   ); } bool ChkLevel(){    return true;   // since we are using water level switch in serial manner     /*digitalWrite(levelOut,HIGH);     bool val = digitalRead(levelIn);   return (val == LOW)    ;*/ }