automatic irrigation system by sensing soil moisture content

denpeding on soil moisture content in the feild motor will on and off

1. AUTOMATIC IRRIGATION SYSTEM ON SENSING SOIL MOISTURE Submitted by BATCH NO:16 P.MURALI-15H65A0211 B.YOGESH-15H65A0202 B.MANISH-13H61A0205 T.AKANSHA-14H61A0203 Under the Guidnce of Mr.M.LALU ( Asst.Professor ) Department of EEE

2. ABSTRACT: The project is designed to develop an automatic irrigation system which switches the pump motor ON/OFF on sensing the moisture content of the soil. The project uses ARDUINO UNO R3 in which ATmega328P microcontroller. which is programmed to receive the input signal from the moisture sensor. This is achieved by using an op-amp as comparator LM385. Once the controller receives this signal, it generates an output that drives a relay for operating the water pump.

3. PRESENT SCENARIO : In present days, especially farmers are facing major problems in watering their agriculture fields , its because they have no proper idea of when the power is available that they can pump water. Even after the power comes, they need to wait until the field is properly watered , which makes them to stop doing their other works. To avoid this problems by automatic irrigation type projects are helpful.

4. BLOCK DIAGRAM POWER SUPPLY ARDUINO RELAY DRIVER 12V PUMP LCD 230V AC SUPPLY MOISTURE SENSOR 12V DC ANALOG DIGITAL

5. COMPONENTS TRANSFORMER (230-12V AC) RECTIFICATION ARDUINO MOISTURE SENSOR RELAY CIRCUIT WATER PUMP LCD

6. TRANSFORMER: A step down transformer is used which steps down the voltage from 230v to 12v ac. RECTIFICATION: By using a bridge rectifier circuit the ac supply is converted to dc. ARDUIUNO: Arduiuno is used to control the whole process. The output of the soil moisture sensor is connected to the digital pins of the arduiuno .

7. MOISTURE SENSOR: The moisture sensor senses the moisture content in the soil and gives an analog output which needs to be interfaced with the arduiuno . RELAY CIRCUIT: The relay is used to control the small water pump and it is driven by transistor. The transistor is further connected to the digital pin of arduiuno . WATER PUMP: A 12v dc water pump is used to artificially supply water. It can be triggered ON/OFF by sending signals as required.

8. LCD PANEL: LCD   is used for displaying status and messages.  LCD is used in 4 bit mode and driven by arduiuno library

9. CIRCUIT DIAGRAM :

10. OPERATION : MOISTURE SENSOR: The Soil Moisture Sensor is used to measure the volumetric water content of soil.

11. The arduino microcontroller which is programmed to receive the input signal of varying moisture condition of the soil through the sensing arrangement. When the soil condition is less than the reference value, then the soil is considered as dry. The arduino microcontroller then turns ON the motor drive circuit prompts the motor to pump water to the plants. When the soil condition is greater than the reference value, the soil becomes wet. Then controller turns OFF the motor driver circuit .

12. APPLICATIONS: I rrigation in field. Irrigation in parks,gardens . Very efficient for paddy Water sprinklers

13. MERITS: Easy to design and install. Low cost and reliable circuit. Complete elimination of manpower. System can be switched into manual mode whenever required. Mainly it eliminate hazards.

14. CONCLUSION As water supplies become scarce and polluted, there is a need to irrigate more efficiently in order to minimize water use and chemical leaching. Therefore this project is the best solution for this crisis. The primary applications for this project are for farmers and gardeners who do not have enough time to water their crops/plants. It also covers those farmers who do not waste water during irrigation.

15. THANK YOU