The aim of this application is to keep the garden plants
alive, when we are on vacation.
This uses a solenoid valve, controlled by Arduino UNO for
feeding the micro irrigation kit.
Equipment inventory
Solenoid valve
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1
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Electronically controlled water valve
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Arduino UNO
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1
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The main microcontroller
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Single channel Relay
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1
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To control the current through solenoid
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Power supplies
5V
for Arduino
24
V for solenoid
Optionally
12V for relay
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1
1
1
|
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Drip irrigation water feeder tube
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Length varies according to the number of plants / pots to be
irrigated
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Plumbing accessories
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To connect the drip irrigation system to main water inlet.
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Arduino library
Time Library (http://www.pjrc.com/teensy/td_libs_Time.html)
Connection block diagram
Arduino Code
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#include <Time.h>
#include <TimeAlarms.h>
#include <dht.h>
int pin = 10;
dht DHT;
#define dht_dpin A0;
void setup()
{
pinMode(pin, OUTPUT);
pinMode(13, OUTPUT);
digitalWrite(pin,LOW);
digitalWrite(13,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(3600,
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 solenoid for 2 mins
Serial.println("Early
morning");
solenoid(2);
}
void solenoid(int min)
{
digitalWrite(pin,HIGH); //
Open solenoid
delay(min * 60 * 1000);
digitalWrite(pin,LOW); //
shut solenoid
}
void Hourly()
{
Serial.println("Hourly");
// check during daytime only
if( hour() >= 8 &&
hour() <= 17 && ChkTemp())
solenoid(1);
}
bool ChkTemp()
{
DHT.read11(A0);
// if temp > 30 and
humidity > 75%
return (DHT.temperature >=
30 || DHT.humidity >= 75 );
}
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Further improvements, to control the solenoid hourly reoccurring function additionally based on moisture level present in the soil rather than just atmospheric temperature and humidity levels.
