PRESENTED BY

ANJALI GOPAL

GUIDED BY Prof. PRADEEP

HOD ECE

GSM BASED SMART IRRIGATION

• ObjectiveIntroductionArchitectureResourcesFlow chartExecution codeConclusion

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OVERVIEW

INTRODUCTION

Reduce the man power & conserve the water

Real time sensing and control

Interfacing of microcontroller through moisture sensor and hence to GSM through MAX 232

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ARCHITECTURE

MasterControlle

r32bit

solenoid

Relay driver

Water

Pump

ADC

Moisture sensor

MAX 232

GSM Power supply

User

Android

mobile

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RESOURCES

SENSORMICROCONTROLLERMAX 232GSM

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SENSOR

The feedback control mechanismfrequency domain moisture sensors (capacitance

sensor)

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SOIL MOISTURE MEASUREMENTS

DIRECT METHODS

THERMO-GRAVIOMETRIC

THERMO-VOLUMETRIC

INDIRECT METHODS

VOLUMETRIC

TENSIOMETRIC

6

cru.cahe.wsu.edu/CEPublications/FS083E/FS083E.pdf

SOIL MOISTURE SENSORS

TRANSIOMETRICVOLUMETRIC

TDR

FDR (CAPACITANCE

SENSOR)

NEUTRON PROBE

GYPSUM BLOCK

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Time domain reflectometry sensors(TDR)

• TDR is the most accurate sensor

• measure the reflectance of the pulse

• The travel time of the pulse is used to directly calculate dielectric const(Ka)

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Neutron probe sensors•  Measure hydrogen atoms in the soil

• The neutrons collide with hydrogen atoms in the soil (i.e. water)

• More collisions the more water in the soil

• A measurement is made of the number of neutrons that have collided

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Frequency domain sensors (capacitance sensors)

•Determines Ka by measuring the charge time of a capacitor

•Ideal in field applications using wireless networks

•Better resolution than TDR

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HYDRA PROBES• Relatively inexpensive and widely used

• It measures both the real (εr) and Imaginary (εi) components of the complex soil dielectric constant at 50 MHz

•Hydra Probe is buried in the soil hence referred as “in-situ” placement

• Buried at several different depths in order to measure soil parameters over a wide area

• power supply 7-30VDC 30.7.201511

• The Hydra probe is a sensor that consists of : a 4-cm diameter cylindrical head four 0.3-cm diameter tines tines protrude 5.8 cm measure temperature

• The Hydra Probe delivers very accurate measurements of soil conditions, including:

soil moisture temperatureelectrical conductivityDielectric permitivity 30.7.201512

• The Hydra Probe is available in three versions:

SDI-12 RS-485 Analog

• ANALOGfast measurement rateThe output is 4 voltages

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The tines serve as wave guides

Tines are pushed into soil material

The probe converts the signal response into the dielectric permittivity

14

http://www.stevenswater.com/soil_moisture_sensors/

MICROCONTROLLER The NXP (founded by Philips) LPC2129 is an ARM7TDMI-S 32-bit RISC Microcontroller 256KB on-chip Flash ROM with In-System Programming (ISP) and In-Application Programming (IAP) 16KB RAM 9 External intrrupts Two UARTs I2C serial interface 2 SPI serial interfaces Two timers (7 capture/compare channels) PWM unit with up to 6 PWM outputs 4-channels 10bit ADC 2 CAN channels. Real Time Clock Watchdog Timer 46 General purpose I/O pins CPU clock up to 60 MHz On-chip crystal oscillator and On-chip PLL

30.7.201515www.keil.com/dd/docs/datashts/philips/lpc2119_2129.pdf

GSMGSM -Global System for Mobile communications.

•ETSI - European telecommunication standards

• protocols for second-generation (2G) digital cellular networks 

•developed as a digital system using TDMA technology

30.7.201516www.engineersgarage.com/articles/gsm-gprs-modules

FEATURES

Dual band GSM/GPRS 900/1800MHz

Configurable baud rate

SIM card holder

Built in network status LED

Inbuilt powerful TCP/IP protocol

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WorkingGSM modem doesn’t have a keypad &

display. serial interfacecommands are called as AT commandsEvery command starts with "AT“ hence called

as AT commands. AT stands for attention

 GSM/GPRS module consists of a GSM/GPRS modem assembled together with power supply circuit and communication interfaces.

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GSM modem works with 12V DC mismatch of voltage levels. Interfaced with the help of RS232 cable. MAX232 device : convert TTL logic level to RS232

level The RS232 device is an interface between DTE

&DCE

GSM Modem Interfacing with Microcontroller

30.7.201520https://en.wikipedia.org/wiki/MAX232

FLOWCHART

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PROJECT EXECUTION STEPS

Sensor reads the moisture contained in the soil and feeds to the microcontroller .

Microcontroller compare the sensor input and the threshold value

If the sensor input value is less than 50%, user is informed via android mobile phone. plants get watered or else it continues to read the moisture value

The watering stops till the moisture contain reaches the threshold value

When the pump stops user is again signaled via mobile

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CONCLUSION

A reliable and efficient system for monitoring the environmental parameters

Allows user to see accurate changes in it

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REFERENCES

www.engineersgarage.com/articles/gsm-gprs-modules

www.edgefx.in/gsm-interfacing-8051-microcontroller/ www.stevenswater.com/catalog/Stevens-Hydra- Probe.aspx

www.ijert.org/.../smart-irrigation-system-using-wireless-sensor-network

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THANK YOU