automatic plant watering system using arduino uno

1. Automatic Plant Watering
System
Guide: Dr.V.Vasu sir
S.S.Sri Vatsav (22MEM3R16)
Ganesh S. Lahoti (22MEM3R06)

2. Introduction
 This system is built using Arduino UNO.
 In this system, soil moisture sensor senses the moisture level
of the soil.
 If soil will get dry then sensor senses low moisture level and
automatically switches on the water pump to supply water to
the plant.
 As plant get sufficient water and soil get wet then sensor
senses enough moisture in soil. After which the water pump
will automatically get stopped.

3. Components used
 Arduino UNO
 5V Relay
 Soil moisture sensor
 Watering tube
 Jumper wires
 5V DC Motor pump
 9V DC power supply

4. Working of Soil moisture Sensor
 The soil moisture sensor consists of two probes which are
used to measure the volumetric content of water.
 The two probes allow the current to pass through the soil and
then it gets the resistance value to measure the moisture value.
 When there is more water, the soil will conduct more
electricity which means that there will be less resistance.
 Dry soil conducts electricity poorly, so when there will be less
water, then the soil will conduct less electricity which means
that there will be more resistance.
 This sensor can be connected in two modes; Analog mode and
digital mode.

5. Soil Moisture Sensor

6. Working
 Now the system has to supply water to soil in which plant is
located
 For this to happen we have to write and compile a program
code and transfer it to Arduino.
 Connect the Arduino to the PC and open the ARDUINO IDE
and write the code.
 Use the analogRead function to read the values for the sensor.

7. Code
const int Pin=0;
const int limit=480;
void setup() {
Serial.begin(9600);
pinMode(13,OUTPUT);
pinMode(3,OUTPUT);
// put your setup code here, to run once:
}
void loop() {
int value;
value=analogRead(Pin);
Serial.println("analog value:");
Serial.println(value);
delay(1000);
if (value<limit)
{
digitalWrite(3,HIGH);
}
else
{
digitalWrite(3,LOW);
}
// put your main code here, to run repeatedly:
}

8. Results

9. Results