Ieeepro techno solutions 2013 ieee embedded project - automated irrigation system using a wsn

166 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 63, NO. 1, JANUARY 2014
Automated Irrigation System Using a Wireless
Sensor Network and GPRS Module
Joaquín Gutiérrez, Juan Francisco Villa-Medina, Alejandra Nieto-Garibay, and Miguel Ángel Porta-Gándara
Abstract—An automated irrigation system was developed to
optimize water use for agricultural crops. The system has a
distributed wireless network of soil-moisture and temperature
sensors placed in the root zone of the plants. In addition, a
gateway unit handles sensor information, triggers actuators,
and transmits data to a web application. An algorithm was
developed with threshold values of temperature and soil moisture
that was programmed into a microcontroller-based gateway to
control water quantity. The system was powered by photovoltaic
panels and had a duplex communication link based on a
cellular-Internet interface that allowed for data inspection and
irrigation scheduling to be programmed through a web page. The
automated system was tested in a sage crop field for 136 days and
water savings of up to 90% compared with traditional irrigation
practices of the agricultural zone were achieved. Three replicas
of the automated system have been used successfully in other
places for 18 months. Because of its energy autonomy and low
cost, the system has the potential to be useful in water limited
geographically isolated areas.
Index Terms—Automation, cellular networks, Internet,
irrigation, measurement, water resources, wireless sensor
networks (WSNs).
I. INTRODUCTION
AGRICULTURE uses 85% of available freshwater reso-
urces worldwide, and this percentage will continue to be
dominant in water consumption because of population growth
and increased food demand. There is an urgent need to create
strategies based on science and technology for sustainable
use of water, including technical, agronomic, managerial, and
institutional improvements [1].
There are many systems to achieve water savings in various
crops, from basic ones to more technologically advanced ones.
For instance, in one system plant water status was monitored
and irrigation scheduled based on canopy temperature distribu-
tion of the plant, which was acquired with thermal imaging [2].
In addition, other systems have been developed to schedule
irrigation of crops and optimize water use by means of a crop
water stress index (CWSI) [3]. The empirical CWSI was first
defined over 30 years ago [4]. This index was later calculated
Manuscript received January 30, 2013; revised April 15, 2013; accepted
May 19, 2013. Date of publication August 19, 2013; date of current version
December 5, 2013. This work was supported by SAGARPA-CONACYT under
Grant 2009-126183. The Associate Editor coordinating the review process was
Dr. Subhas Mukhopadhyay.
The authors are with the Engineering Group, Centro de Investi-
gaciones Biológicas del Noroeste, La Paz 23090, Mexico (e-mail:
joaquing04@cibnor.mx; jfvilla@cibnor.mx; anieto04@cibnor.mx;
maporta@cibnor.mx).
Color versions of one or more of the figures in this paper are available
online at http://ieeexplore.ieee.org.
Digital Object Identifier 10.1109/TIM.2013.2276487
using measurements of infrared canopy temperatures, ambient
air temperatures, and atmospheric vapor pressure deficit values
to determine when to irrigate broccoli using drip irrigation [5].
Irrigation systems can also be automated through information
on volumetric water content of soil, using dielectric moisture
sensors to control actuators and save water, instead of a pre-
determined irrigation schedule at a particular time of the day
and with a specific duration. An irrigation controller is used
to open a solenoid valve and apply watering to bedding plants
(impatiens, petunia, salvia, and vinca) when the volumetric
water content of the substrate drops below a set point [6].
Other authors have reported the use of remote canopy tem-
perature to automate cotton crop irrigation using infrared ther-
mometers. Through a timed temperature threshold, automatic
irrigation was triggered once canopy temperatures exceeded
the threshold for certain time accumulated per day. Automatic
irrigation scheduling consistently has shown to be valuable
in optimizing cotton yields and water use efficiency with
respect to manual irrigation based on direct soil water mea-
surements [7].
An alternative parameter to determine crop irrigation needs
is estimating plant evapotranspiration (ET). ET is affected
by weather parameters, including solar radiation, temperature,
relative humidity, wind speed, and crop factors, such as stage
of growth, variety and plant density, management elements,
soil properties, pest, and disease control [8]. Systems based on
ET have been developed that allow water savings of up to 42%
on time-based irrigation schedule [9]. In Florida, automated
switching tensiometers have been used in combination with
ET calculated from historic weather data to control automatic
irrigation schemes for papaya plants instead of using fixed
scheduled ones. Soil water status and ET-based irrigation
methods resulted in more sustainable practices compared with
set schedule irrigation because of the lower water volumes
applied [10].
An electromagnetic sensor to measure soil moisture was
the basis for developing an irrigation system at a savings of
53% of water compared with irrigation by sprinklers in an
area of 1000 m2 of pasture [11]. A reduction in water use
under scheduled systems also have been achieved, using soil
sensor and an evaporimeter, which allowed for the adjustment
of irrigation to the daily fluctuations in weather or volumetric
substrate moisture content [12].
A system developed for malting barley cultivations in large
areas of land allowed for the optimizing of irrigation through
decision support software and its integration with an in-
field wireless sensor network (WSN) driving an irrigation
0018-9456 © 2013 IEEE

GUTIÉRREZ et al.: AUTOMATED IRRIGATION SYSTEM USING A WSN AND GPRS MODULE 167
machine converted to make sprinkler nozzles controllable.
The network consisted of five sensing stations and a weather
station. Each of the sensing stations contained a data logger
with two soil water reflectometers, a soil temperature sensor,
and Bluetooth communication. Using the network information
and the irrigation machine positions through a differential
GPS, the software controlled the sprinkler with application
of the appropriate amount of water [13]. Software dedicated
to sprinkler control has been variously discussed [14].
A data acquisition system was deployed for monitoring
crop conditions by means of soil moisture and soil, air, and
canopy temperature measurement in cropped fields. Data were
downloaded using a handheld computer connected via a serial
port for analysis and storage [15]. Another system used to
achieve the effectiveness of water management was developed
based on a WSN and a weather station for Internet monitoring
of drainage water using distributed passive capillary wick-type
lysimeters. Water flux leached below the root zone under an
irrigated cropping system was measured [16]. There are hybrid
architectures, wireless modules are located inside the green-
house where great flexibility is required, and wired modules
are used in the outside area as actuator controllers [17].
The development of WSNs based on microcontrollers and
communication technologies can improve the current meth-
ods of monitoring to support the response appropriately in
real time for a wide range of applications [18], considering
the requirements of the deployed area, such as terrestrial,
underground, underwater, multimedia, and mobile [19]. These
applications involve military operations in scenarios of bat-
tlefield, urban combat, and force protection, with tasks of
presence, intrusion, ranging, imaging, detection of chemical,
toxic material, biological, radiological, nuclear, and explo-
sive [20], [21]. In addition, sensor networks have been used
in health care purposes for monitoring, alerting, assistance,
and actuating with security and privacy to support real-time
data transmission [22]. Vital sign monitoring, such as ECG,
heart rate, body temperature, has been integrated in hospitals
and homes through wearable or e-textile providing reports
and alerts to personal in case of emergency and tracking the
location of patients within the hospital limits [23]. WSNs have
been used to remote monitor healthcare of dependent people at
their homes through several biomedical sensors such as ECG,
blood pressure, body temperature [24], and body motion [25].
Home applications comprised wireless embedded sensors
and actuators that enable monitoring and control. For comfort
and efficient energy management, household devices have been
controlled through sensors that monitor parameters such as
temperature, humidity, light, and presence, avoiding waste of
energy [26]. Sensor networks have been used for security pur-
poses, based on several sensors such as smoke detectors, gas
sensors, and motion sensors, to detect possible risk situations
that trigger appropriate actions in response, such as send an
alert to a remote center through wireless communication [27].
In industrial environments, WSNs have been installed to
provide real-time data acquisition for inventory management,
to equipment monitoring for control with appropriate actions,
reducing human errors and preventing manufacturing down-
time [28], [29]. For example, industrial WSN have been imple-
mented to motor fault diagnosis [30] and for the monitoring
of the temperature-sensitive products during their distribution
has been proposed [31]. In addition, there are wireless systems
for structural identification under environmental an operational
parameters, such as load in bridges [32].
In environmental applications, sensor networks have been
used to monitor a variety of environmental parameters or
conditions in marine, soil, and atmospheric contexts [33].
Environmental parameters, including humidity, pressure, tem-
perature, soil water content, and radiation with different spatial
and temporal resolution and for event detection such as disaster
monitoring, pollution conditions, floods, forest fire, and debris
flow is continuously monitored [34]–[36]. Applications in
agriculture have been used to provide data for appropriate
management, such as monitoring of environmental condi-
tions like weather, soil moisture content, soil temperature,
soil fertility, mineral content, and weed disease detection,
monitoring leaf temperature, moisture content, and monitoring
growth of the crop, automated irrigation facility and storage
of agricultural products [37]–[39].
Various commercial WSNs exist, ranging from limited and
low-resolution devices with sensors and embedded proces-
sors to complete and expensive acquisition systems that sup-
port diverse sensors and include several communication fea-
tures [40]. Recent advances in microelectronics and wireless
technologies created low-cost and low-power components,
which are important issues especially for such systems such
as WSN [41]. Power management has been addressed in
both hardware and software with new electronic designs
and operation techniques. The selection of a microprocessor
becomes important in power aware design. Modern CMOS
and micro-electro-mechanical systems (MEMS) technologies
allowed manufacturers to produce on average every three years
a enhance generation of circuits by integrating sensors, signal
conditioning, signal processing, digital output options, com-
munications, and power supply units [42], [43]. For example,
the parallel combination of a battery and a supercapacitor has
been used to extend the runtime of low-power wireless sensor
nodes [44].
Energy harvesting mechanisms have been employed, in
cases where it is difficult for changing or recharging batteries,
hence this strategy has involved combining it with efficient
power management algorithms to optimize battery lifetime.
Power harvesting is a complementary approach that depends
on ambient energy sources, including environmental vibration,
human power, thermal, solar, and wind that can be converted
into useable electrical energy [45]–[47]. On the other hand,
several strategies have been implemented to reduce power con-
sumption, such as power-aware protocols, resource and task
management, communication, topology control and routing,
models based on events, and congestion control mechanism
to balance the load, prevent packet drops, and avoid network
deadlock using a combination of predeployed group keys that
allow the dynamic creation of high security subnetworks and
optimizes energy efficiency of sensor networks [48], [49].
For instance, energy-saving strategies have been achieved
through scheduling [50], [51], sleep or wake up schemes,
and adaptive radio frequency (RF) in nodes, and choosing

a network configuration [52]. There are also algorithms to
maximize the network coverage ratio with a predefined balance
the energy consumption in the whole WSN [53], to reduce
both the transmission and the computational loads at the
node level [54], and to estimate online the optimal sampling
frequencies for sensors [55].
In a wireless node, the radio modem is the major power
consuming component; recently, wireless standards have been
established with medium access control protocols to provide
multitask support, data delivery, and energy efficiency per-
formance [56], such as the standards for wireless local area
network, IEEE 802.11b (WiFi) [57] and wireless personal
area network (WPAN), IEEE 802.15.1 (Bluetooth) [58], IEEE
802.15.3 (UWB) [59], and IEEE 802.15.4 (ZigBee) [60], and
those open wireless communication standards for Internet pro-
tocol version 6 (IPv6) over low-power wireless personal area
networks 6LoWPAN [61], [62], wireless highway addressable
remote transducer WirelessHART [63], and ISA100.11a [64]
developed by the International Society of Automation.
In this paper, the development of the deployment of an
automated irrigation system based on microcontrollers and
wireless communication at experimental scale within rural
areas is presented. The aim of the implementation was to
demonstrate that the automatic irrigation can be used to reduce
water use. The implementation is a photovoltaic powered
automated irrigation system that consists of a distributed
wireless network of soil moisture and temperature sensors
deployed in plant root zones. Each sensor node involved a
soil-moisture probe, a temperature probe, a microcontroller
for data acquisition, and a radio transceiver; the sensor mea-
surements are transmitted to a microcontroller-based receiver.
This gateway permits the automated activation of irrigation
when the threshold values of soil moisture and temperature
are reached. Communication between the sensor nodes and
the data receiver is via the Zigbee protocol [65], [66] under
the IEEE 802.15.4 WPAN. This receiver unit also has a duplex
communication link based on a cellular-Internet interface,
using general packet radio service (GPRS) protocol, which is a
packet-oriented mobile data service used in 2G and 3G cellular
global system for mobile communications (GSM). The Internet
connection allows the data inspection in real time on a website,
where the soil-moisture and temperature levels are graphically
displayed through an application interface and stored in a
database server. This access also enables direct programming
of scheduled irrigation schemes and trigger values in the
receiver according the crop growth and season management.
Because of its energy autonomy and low cost, the system has
potential use for organic crops, which are mainly located in
geographically isolated areas where the energy grid is far away.
II. AUTOMATED IRRIGATION SYSTEM
The automated irrigation system hereby reported, consisted
of two components (Fig. 1), wireless sensor units (WSUs) and
a wireless information unit (WIU), linked by radio transceivers
that allowed the transfer of soil moisture and temperature
data, implementing a WSN that uses ZigBee technology. The
WIU has also a GPRS module to transmit the data to a web
Fig. 1. Configuration of the automated irrigation system. WSUs and a WIU,
based on microcontroller, ZigBee, and GPRS technologies.
Fig. 2. WSU. (a) Electronic component PCB. (b) Radio modem ZigBee.
(c) Temperature sensor. (d) Moisture sensor. (e) Rechargeable batteries.
(f) Photovoltaic cell. (g) Polyvinyl chloride container.
server via the public mobile network. The information can
be remotely monitored online through a graphical application
through Internet access devices.
A. Wireless Sensor Unit
A WSU is comprised of a RF transceiver, sensors, a
microcontroller, and power sources. Several WSUs can be
deployed in-field to configure a distributed sensor network
for the automated irrigation system. Each unit is based on
the microcontroller PIC24FJ64GB004 (Microchip Technolo-
gies, Chandler, AZ) that controls the radio modem XBee
Pro S2 (Digi International, Eden Prairie, MN) and processes
information from the soil-moisture sensor VH400 (Vegetronix,
Sandy, UT), and the temperature sensor DS1822 (Maxim
Integrated, San Jose, CA). These components are powered
by rechargeable AA 2000-mAh Ni-MH CycleEnergy batteries
(SONY, Australia). The charge is maintained by a photovoltaic
panel MPT4.8-75 (PowerFilm Solar, Ames, IN) to achieve
full energy autonomy. The microcontroller, radio modem,
rechargeable batteries, and electronic components were encap-
sulated in a waterproof Polyvinyl chloride (PVC) container
(Fig. 2). These components were selected to minimize the
power consumption for the proposed application.

Start
Request
date and time
Connection
WIU
Get date/time
INT-RTCC?
Enable
Voltage
Regulator
Package/Send
data to WIU
Measure:
Moisture
Temperature
Voltage
Sleep Mode
Yes
Disenable
Voltage
Regulator
Fig. 3. Algorithm of wireless sensor unit (WSU) for monitoring the soil-
moisture and temperature.
1) Single-Chip PIC24FJ64GB004: A 16-bit microcontroller
with 44-pins and nanoWatt XLP technology that operates
in a range 2.0 to 3.6 V at 8 MHz with internal oscillator.
It has up to 25 digital input/output ports, 13-, 10-bit analog-
to-digital converters (ADC), two serial peripheral interface
modules, two I2C, two UART, 5 16-bit timers, 64 KB of
program memory, 8 KB of SRAM, and hardware real-time
clock/calendar (RTCC). The microcontroller is well suited for
this remote application, because of its low-power operating
current, which is 175 µA at 2.5 V at 8 MHz and 0.5 µA for
standby current in sleep mode including the RTCC.
The microcontroller was programmed in C compiler 4.12
(Custom Computer Services, Waukesha, WI) with the appro-
priate algorithm (Fig. 3) for monitoring the soil-moisture probe
through an analog-to-digital port and the soil-temperature
probe through another digital port, implemented in 1-Wire
communication protocol. A battery voltage monitor is included
through a high-impedance voltage divider coupled to an
analog-to-digital port. The data are packed with the cor-
responding identifier, date, and time to be transmitted via
XBee radio modem using a RS-232 protocol through two
digital ports configured as transmitter (TX) and receiver (RX),
respectively. After sending data, the microcontroller is set in
sleep mode for certain period according to the sensor sampling
rate desired, whereas the internal RTCC is running. This
operation mode allows energy savings. When the WSU is
launched for first time, the algorithm also inquires the WIU,
Fig. 4. Communication frames between a WSU and the WIU.
the date and time to program the RTCC, and periodically
updates it for synchronization.
2) ZigBee Modules: ZigBee (over IEEE 802.15.4) technol-
ogy is based on short range WSN and it was selected for this
battery-operated sensor network because of its low cost, low
power consumption, and greater useful range in comparison
with other wireless technologies like Bluetooth (over IEEE
802.15.1), UWB (over IEEE 802.15.3), and Wi-Fi (over IEEE
802.11) [67]. The ZigBee devices operate in industrial, scien-
tific, and medical 2.4-GHz radio band and allow the operation
in a so-called mesh networking architecture, which can be
differentiated into three categories: 1) coordinator; 2) router;
and 3) end device.
From a wide range of commercial ZigBee devices, the
XBee-PRO S2 is an appropriate original equipment manufac-
turer module to establish communication between a WSU and
the WIU because of its long-range operation and reliability of
the sensor networking architecture. The XBee-PRO S2 is a RF
modem with integrated chip antenna, 20-pins, and 13 general
purpose input/output (GPIO) ports available of which four are
ADC. It can operate up to a distance of 1500 m in outdoor
line-of-sight with 170 mA of TX peak current and 45 mA for
RX current at 3.3 V and power-down current of 3.5 µA.
The XBee radio modem of each WSU is powered at 3.3 V
through a voltage regulator ADP122AUJZ-3.3-R7 (Analog
Devices, Norwood, MA) and interfaced to the host microcon-
troller through its serial port, a logic-level asynchronous serial,
and voltage compatible UART configured at 9600 baud rate,
no - parity, 1 - start bit, 1 - stop bit, 8 - data bits.
The WSUs were configured such as end devices to deploy
a networking topology point-to-point based on a coordinator
that was implemented by the XBee radio modem of the WIU.
An end device has the following characteristics: 1) it must join
a ZigBee PAN before it can transmit or receive data; 2) cannot
allow devices to join the network; 3) must always transmit and
receive RF data through its parent; 4) cannot route data; and
5) can enter low power modes to conserve power and can be
battery powered. The least significant byte of the unique 64-bit
address is used to label the information of the soil moisture
and temperature for each WSU in the network. This byte is
registered in the WIU as the identifier (ID) associated to each
WSU. As shown in the sample frames to request date/time,
receive date/time, and send data packaged to the WIU (Fig. 4).
3) Soil Sensor Array: The sensor array consists of two soil
sensors, including moisture and temperature that are inserted in
the root zone of the plants. The VH400 probe was selected to

estimate the soil moisture because of low power consumption
(<7 mA) and low cost. The probe measures the dielectric
constant of the soil using transmission line techniques at
80 MHz, which is insensitive to water salinity, and provides
an output range between 0 and 3.0 V, which is proportional to
the volumetric water content (VWC) according to a calibration
curve provided by the manufacturer. The sensor was powered
at 3.3 V and monitored by the microcontroller through an ADC
port.
Soil temperature measurements were made through the dig-
ital thermometer DS1822. The sensor converts temperature to
a 12-bit digital word and is stored in 2-B temperature registers,
corresponding to increments of 0.0625 °C. The temperature is
required through a reading command and transmitted using
1-Wire bus protocol implemented in the microcontroller
through one digital port. The thermometer has ±2.0 °C
accuracy over −10 °C to +85 °C temperature range and a
unique 64-bit serial number. The sensor is a 3-pin single-chip
and TO92 package that was embedded in a metal capsule and
sealed in a waterproof PVC cylindrical container.
To calibrate the soil moisture, several samples were prepared
with 1 kg of dry soil from the crop area. Its composition was
loamy sand with 80% sand separate, 4.5% clay separate, and
15.6% silt separate. The soil water holding capacity was of
20.7% VWC corresponding to measured output voltages of
1.45 V. The temperature sensors were calibrated through a
reference mercury thermometer CT40, with 0.1 °C divisions
and a range from −1 °C to 51 °C. The thermometer and the
temperature sensors were placed in an insulated flask filled
with mineral oil at 10 °C and 40 °C.
4) Photovoltaic Cell: To maintain the charge of the WSU
batteries, a solar panel MPT4.8-75 was employed. Each solar
panel delivers 50 mA at 4.8 V, which is sufficient energy
to maintain the voltage of the three rechargeable batteries.
A MSS1P2U Schottky diode (Vishay, Shelton, CT) is used
to prevent the solar module and to drain the battery when
is in the dark. The solar panel is encapsulated in a 3-mm
clear polyester film with dimensions of 94 mm × 75 mm.
This flexible panel was mounted on a PVC prismatic base
(100 mm × 80 mm × 3.17 mm) that is fastened in the upper
part of a PVC pole allowing for the correct alignment of the
photovoltaic panel to the sun. The stick is 50 cm of length
and 12.5 mm of diameter; the lower end of the pole had a tip
end to be buried.
B. Wireless Information Unit
The soil moisture and temperature data from each WSU are
received, identified, recorded, and analyzed in the WIU. The
WIU consists of a master microcontroller PIC24FJ64GB004,
an XBee radio modem, a GPRS module MTSMC-G2-SP
(MultiTech Systems, Mounds View, MN), an RS-232 inter-
face MAX3235E (Maxim Integrated, San Jose, CA), two
electronic relays, two 12 V dc 1100 GPH Livewell pumps
(Rule-Industries, Gloucester, MA) for driving the water of the
tanks, and a deep cycle 12 V at 100-Ah rechargeable battery
L-24M/DC-140 (LTH, Mexico), which is recharged by a solar
panel KC130TM of 12 V at 130 W (Kyocera, Scottsdale, AZ)
Fig. 5. WIU. (a) Electronic component PCB. (b) Master microcontroller.
(c) Solid state memory. (d) Optical isolators. (e) RS-232 interface. (f) Push
button. (g) Output cables to pumps. (h) Supply cable from charge controller.
(i) PCV box.
through a PWM charge controller SCI-120 (Syscom, Mexico).
All the WIU electronic components were encapsulated in a
waterproof PVC box as shown in Figs. 5 and 6. The WIU can
be located up to 1500-m line-of-sight from the WSUs placed
in the field.
1) Master Microcontroller: The functionality of the WIU is
based on the microcontroller, which is programmed to perform
diverse tasks, as is shown in Fig. 7. The first task of the
program is to download from a web server the date and time
through the GPRS module. The WIU is ready to transmit
via XBee the date and time for each WSU once powered.
Then, the microcontroller receives the information package
transmitted by each WSU that conform the WSN.
These data are processed by the algorithm that first identifies
the least significant byte of a unique 64-bit address encap-
sulated in the package received. Second, the soil moisture
and temperature data are compared with programmed values
of minimum soil moisture and maximum soil temperature
to activate the irrigation pumps for a desired period. Third,
the algorithm also records a log file with the data in a solid
state memory 24FC1025 (Microchip Technologies, Chandler,
AZ) with a capacity of 128 kB. Each log is 12-B long,
including soil moisture and temperature, the battery voltage,
the WSU ID, the date, and time generated by the internal
RTCC. If irrigation is provided, the program also stores a
register with the duration of irrigation, the date, and time.
Finally, these data and a greenhouse ID are also transmitted

Fig. 6. Inside view of the WIU. (a) Radio modem ZigBee. (b) GPRS module.
(c) SIM card. (d) GPRS PCB antenna. (e) Pumps relays.
Fig. 7. Algorithm of the master microcontroller in the WIU for the automated
irrigation system.
at each predefined time to a web server through HTTP via the
GPRS module to be deployed on the Internet web application
in real time.
When the server receives a request for the web page, it
inserts each data to the corresponding field in the database.
This link is bidirectional and permits to change the threshold
values through the website interface; scheduled watering or
remote watering can be performed.
The WIU has also a push button to perform manual irriga-
tion for a programmed period and a LED to indicate when the
information package is received. All the WIU processes can
be monitored through the RS-232 port.
The WIU includes a function that synchronizes the WSUs
at noon for monitoring the status of each WSU. In the case
that all WSUs are lost, the system goes automatically to a
default irrigation schedule mode. Besides this action, an email
is sent to alert the system administrator.
2) GPRS Module: The MTSMC-G2-SP is a cellular modem
embedded in a 64-pins universal socket that offers standards-
based quad-band GSM/GPRS Class 10 performance. This
GPRS modem includes an embedded transmission control
protocol/Internet protocol stack to bring Internet connectivity,
a UFL antenna connector and subscriber identity module
(SIM) socket. The module is capable of transfer speeds up
to 115.2 K b/s and can be interfaced directly to a UART
or microcontroller using AT commands. It also includes an
onboard LED to display network status.
The GPRS was powered to 5 V regulated by UA7805 (Texas
Instruments, Dallas, TX) and operated at 9600 Bd through a
serial port of the master microcontroller and connected to a
PCB antenna. The power consumption is 0.56 W at 5 V.
In each connection, the microcontroller sends AT commands
to the GPRS module; it inquires the received signal strength
indication, which must be greater than −89 dBm to guarantee
a good connection. In addition, it establishes the communica-
tion with the URL of the web server to upload and download
data. If the received signal strength is poor, then all data are
stored into the solid-state memory of the WIU and the system
try to establish the connection each hour.
3) Watering Module: The irrigation is performed by con-
trolling the two pumps through 40-A electromagnetic relays
connected with the microcontroller via two optical isolators
CPC1004N (Clare, Beverly. MA). The pumps have a power
consumption of 48 W each and were fed by a 5000-l water
tank.
Four different irrigation actions (IA) are implemented in the
WIU algorithm:
1) fixed duration for manual irrigation with the push button;
2) scheduled date and time irrigations through the web page
for any desired time;
3) automated irrigation with a fixed duration, if at least one
soil moisture sensor value of the WSN drops below the
programmed threshold level;
4) automated irrigation with a fixed duration, if at least one
soil temperature sensor value of the WSN exceeds the
programmed threshold level.
C. Web Application
Graphical user interface software was developed for real-
time monitoring and programming of irrigation based on
soil moisture and temperature data. The software application
permits the user to visualize graphically the data from each
WSU online using any device with Internet (Fig. 8).
Besides the soil-moisture and temperature graphs, the web
application displays the total water consumption and the kind
of the IA.
The web application also enabled the user direct program-
ming of scheduled irrigation schemes and adjusting the trigger
values in the WIU according to the crop species and season
management. All the information is stored in a database. The
web application for monitoring and programming was coded
in C# language of Microsoft Visual Studio 2010. The database
was implemented in SQL Server 2005.

Fig. 8. Web application of the automated irrigation system to remotely
supervise the soil moisture and temperature of each WSU and change the
threshold values and the scheduled irrigation.
Fig. 9. Greenhouse for organic sage production with WSUs located arbitrarily
in different cultivation beds. (a) WSU-55 on bed 2. (b) WSU-56 on bed 12.
(c) WSU-57 on bed 23. WSU-54 was on bed 1.
III. IRRIGATION SYSTEM OPERATION
The system was tested in a 2400-m2 greenhouse, located
near San Jose del Cabo, Baja California Sur (BCS), Mexico
(23° 10.841’ N, 109° 43.630’ W) for organic sage (Salvia
officinalis) production. The greenhouse had 56 production
beds covered with plastic. Each bed was 14-m long and
had two black polyethylene tubes with drip hole spac-
ing of 0.2 m. The automated irrigation system was used
to irrigate only 600 m2, which corresponded to 14 beds;
whereas, the remaining 42 beds were irrigated by human
supervision to compare water consumption with the tra-
ditional irrigation practices in this production place. Four
WSUs labeled by the last significant byte of the unique
64-bit address (WSU-54, 55, 56, and 57) were located in the
greenhouse at arbitrary points (Fig. 9).
The WSU-57 unit was used to measure the soil moisture and
temperature in the area (bed 23) where the traditional irrigation
practices were employed. The other three units (WSU-54,
55, and 56) were located in beds 1, 2, and 12 to operate
the automated irrigation system with their corresponding soil
moisture and temperature sensors situated at a depth of 10 cm
Fig. 10. Gathered data of the WSUs, in the web application of the automated
irrigation system: soil temperatures, soil moisture, and water supplied (vertical
bars indicate automated and scheduled irrigation).
in the root zone of the plants. These three units allowed
data redundancy to ensure irrigation control. The algorithm
considered the values from the WSU-54, 55, and 56, if one
reached the threshold values the automated irrigation was
performed.
The pumping rate provided 10 ml/min/drip hole, which was
measured in the automated irrigation zone in six different drip
holes.
In accordance with the organic producer’s experience, a
minimum value of 5% VWC for the soil was established as
the moisture threshold level and 30 °C as the temperature
threshold level for the automated irrigation modes (IA-3 and
IA-4, respectively). Initially, the scheduled irrigation (IA-2)
of 35 min/week was used during the first six weeks. After
that, the scheduled irrigation was set at 35 min three times
per week. Sage cultivation finalized after 136 days.
During the cultivation, several automated irrigation periods
were carried out by the system because of the soil-moisture
(IA-3) or temperature (IA-4) levels, regardless of the scheduled
irrigation (IA-2). All data were uploaded each hour to the
web server for remote supervision. For instance, data of
five days are shown (Fig. 10). The first graph shows soil
temperatures. The vertical bars indicate automated irrigation
periods triggered by temperature when soil temperature was
above the threshold value (30 °C). The second graph shows
soil moistures that were above the threshold value (5.0%
VWC), and thus the automated irrigation was not triggered
by soil moisture. Finally, the last graph shows the total water
used by the sage with the corresponding scheduled irrigation
vertical bars for the IA-2. The dots denote the automated and
scheduled irrigation.
Automated irrigation triggered by soil moisture for four
days are shown in Fig. 11; when the soil moisture value fell
below the threshold level of 5.0% VWC, the irrigation system
was activated for 35 min according to IA-3, whereas the soil
temperature remained below the threshold level. Similarly,
Fig. 12 shows automated irrigation triggered by soil temper-
ature; when the temperature was above 30 °C, the irrigation
system was activated for 5 min according to IA-4, whereas
the soil moisture remained above the threshold level.

Fig. 11. Automated irrigation (vertical bars) triggered by the soil moisture
threshold ≤ 5% VWC.
Fig. 12. Automated irrigation (vertical bars) triggered by the soil temperature
threshold ≥30 °C.
10
15
20
25
30
Temperature(°C)
5
10
15
20
VWC(%)
5
10
15
20
20 40 60 80 100 120 140
0
100
200
300
400
Day
Water(m3
)
a
b
c
d
Fig. 13. Daily mean soil temperature (a: traditional; b: automated), daily
mean soil moisture (c: traditional; d: automated), and accumulated water
irrigation volumes (dotted line: traditional; solid line: automated) over the
entire sage cropping season.
Water consumption with the organic producers’ traditional
irrigation procedure consisted of watering with a 2” electrical
pump during 5 h three times per week for the whole cultivation
period. Under this scheme the volume ﬂow rate measured on
site was 10 ml/min/per drip hole, giving a total of 174 l/drip
hole, whilst the automated irrigation system used 14 l/drip
hole. In the entire greenhouse, the sage plants presented similar
fresh biomass regardless of the irrigation procedure during the
whole production period. The average biomass per cut was
110 pounds for the traditional irrigation system corresponding
to 42 production beds and 30 pounds for the automated
irrigation system corresponding to 14 beds.
The automated system was tested in the greenhouse for
136 days (Fig. 13). Daily mean soil moisture and temperature
are shown, as well as the accumulated water used for both
systems. Both mean temperatures presented similar behavior
for the production period, except for the last 30 days, where
the soil temperature for the traditional irrigation practice
Fig. 14. Automated irrigation systems for the experimental production of:
sage (top left), thyme (top right), origanum (bottom left), and basil (bottom
right) in San Jose del Cabo, Los Arados, El Pescadero, and El Comitan,
respectively.
0 5 10 15 20 25 30 35
0
50
100
150
200
250
Current(mA)
Time (s)
(4.47 μA)Sleep
Fig. 15. WSU current consumption in monitoring and sleep modes.
(curve a) was lower than the automated irrigation (curve b).
The daily mean VWC for the traditional irrigation practice
(curve c) was almost constant >16%, whereas that for the
automated irrigation (curve d) was below 10%. In addition, the
accumulated water used are shown corresponding to 14 beds
for each irrigation system. The total water requirement was
341 m3 for the traditional one and 29 m3 for the automated
one. Then, the automated irrigation used ∼90% less water with
respect to the traditional irrigation practice.
Another three automated irrigation systems (Fig. 14) have
been tested along 18 months in other places in BCS, Mexico:
El Pescadero (23° 21.866’ N, 110° 10.099’ W), El Comitan-
CIBNOR (24° 7.933’ N, 110° 25.416’ W), and Los Ara-
dos (24° 47.1’ N, 111° 11.133’ W). In these three places,
programmed irrigations (IA-2) were compared with trig-
gered irrigations (IA-3 and IA-4), water savings ∼60% were
obtained.
For cases such as Los Arados, it was found that the signal
receiving strength was too low and the Internet connection
could not be established, hence in this case all data were stored
into the solid state memory of the WIU.
Power consumption of a WSU was measured through
current oscilloscope (UNI-T UT81B) in the monitoring and
sleep operational modes (Fig. 15). Each hour, the soil-moisture

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20
3.5
3.75
4
4.25
4.5
Day
Voltage(V)
Without solar panel
With solar panel
Fig. 16. Battery charge–discharge cycle of a wireless sensor unit (WSU).
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20
0
100
200
300
400
500
600
700
800
Day
Solarradiation(W/m2
)
Fig. 17. Solar radiation along the experiment of charge-discharge cycle of
a wireless sensor unit (WSU).
TABLE I
COMPONENTS FOR WSU
and temperature data were transmitted to the WIU. Before
transmitting the data, the XBee of the WSU was powered on
through the voltage regulator that was enabled for a period
of 20 s by the microcontroller, which was a long enough
time for the radio modem to wake up and transmit the
data. Then, the total average power consumption was kept
at 0.455 mAh. The charge-discharge cycle of the batteries is
shown for 20 days in the winter with the solar panel connected
and disconnected (Fig. 16) using the data registered by the
battery voltage monitor. The solar radiation for those days is
shown in Fig. 17. Thus, the photovoltaic panel and the batteries
provide sufficient energy to maintain the WSU running for the
whole crop season at almost any latitude, due the low energy
consumption.
The WIU average current consumption because of the
electronic components was of 80 mAh in operational mode.
TABLE II
COMPONENTS FOR WIU
However, the total average power consumption was ∼4 Ah
per day considering the two irrigation pumps.
The automated irrigation system implemented is a cost-
effective alternative for agriculture; the cost of each WSU is
∼100 U.S. dollars (Table I), and the WIU cost is ∼1800 U.S.
dollars (Table II).
IV. CONCLUSION
The automated irrigation system implemented was found to
be feasible and cost effective for optimizing water resources
for agricultural production. This irrigation system allows
cultivation in places with water scarcity thereby improving
sustainability.
The automated irrigation system developed proves that the
use of water can be diminished for a given amount of fresh
biomass production. The use of solar power in this irrigation
system is pertinent and significantly important for organic
crops and other agricultural products that are geographically
isolated, where the investment in electric power supply would
be expensive.
The irrigation system can be adjusted to a variety of specific
crop needs and requires minimum maintenance. The modular
configuration of the automated irrigation system allows it to
be scaled up for larger greenhouses or open fields. In addition,
other applications such as temperature monitoring in compost
production can be easily implemented. The Internet controlled
duplex communication system provides a powerful decision-
making device concept for adaptation to several cultivation
scenarios. Furthermore, the Internet link allows the supervision
through mobile telecommunication devices, such as a smart-
phone.
Besides the monetary savings in water use, the importance
of the preservation of this natural resource justify the use of
this kind of irrigation systems.
ACKNOWLEDGMENT
The authors would like to thank P. Luna, J. Cobos,
A. Alvarez, C. Soto, M. Cordoba, and J. Mandujano for their
support.

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Joaquín Gutiérrez received the Ph.D. degree in
artificial intelligence from the Instituto Tecnológico
y de Estudios Superiores de Monterrey, Monterrey,
México, in 2004.
He is a Researcher with the Centro de Investiga-
ciones Biológicas del Noroeste, S.C., La Paz, BCS,
México. His current research interests include the
development and experimental validation of robotic
systems for biological research applications.
Juan Francisco Villa-Medina received the B.T.
degree in computational engineering from Instituto
Tecnológico de La Paz, México, in 2008.
He is a Technician with the Centro de Investiga-
Mexico. His current research interests include the
development of engineering systems.
Alejandra Nieto-Garibay received the Ph.D. degree
in biology with a major in ecology from the Centro
Universitario de Ciencias Biológicas y Agropecuar-
ias, Universidad de Guadalajara, Guadalajara, Méx-
ico, in 2006.
She is a Researcher with the Centro de Inves-
tigaciones Biológicas del Noroeste, S.C., La Paz,
BCS, México, in the Agriculture Program. Her cur-
rent research interests include the development and
experimental validation of agricultural technology in
semi-arid environment.
Miguel Ángel Porta-Gándara received the Ph.D.
degree in engineering from the Universidad Nacional
Autónoma de México, México City, México, in
1997.
He is a Researcher with the Centro de Investiga-
Mexico. His current research interests include the
development of engineering systems for biological
research applications.

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