go to main index know about us who we are and what we are provide ? we provide training on how to reach us send e-mail us
   

 

Green bee with Five sensors

 

Introduction and working

Appropriate environmental conditions are necessary for optimum plant growth, improved
crop yields, and efficient use of water and other resources. Automating the data acquisition
process of the soil conditions and various climatic parameters that govern plant growth allows
information to be collected at high frequency with less labor requirements.

The objective of this project is to design a simple, easy to install, microcontroller-based
circuit to monitor and record the values of temperature, humidity, soil moisture gas and sunlight of
the natural environment that are continuously modified and controlled in order optimize them to
achieve maximum plant growth and yield. The controller used is a low power, cost efficient chip
manufactured by ATMEL having 8K bytes of on-chip flash memory. It communicates with the
various sensor modules in real-time in order to control the light, aeration and drainage process
efficiently inside a greenhouse by actuating a cooler, fogger, dripper and lights respectively
according to the necessary condition of the crops. An integrated Liquid crystal display (LCD) is
also used for real time display of data acquired from the various sensors and the status of the
various devices. Also, the use of easily available components reduces the manufacturing and
maintenance costs. The design is quite flexible as the software can be changed any time. It can
thus be tailor-made to the specific requirements of the user.

This makes the proposed system to be an economical, portable and a low maintenance
solution for greenhouse applications, especially in rural areas and for small scale agriculturists.

 

Main part of this project is gas sensor.

Here we use TGS gas sensor. This sensor is a 6 pin sensor . Top and  bottom of the sensor is covered with 100 mesh stainless stell wire cloth. The heart of the sensor is the cylindrical form in the middle of the unit. The cylinder is a ceramic material with the SnO2 material deposited on its surface. The heater coil is located inside the ceramic cylinder. The heater has a resistance of 38 ohms.

 

Output of the gas sensor is connected the ic 555 as a monostable trigger ic. As the sensor is detect a gas then ic 555 activate automatically and then output of the ic 555 is connected to the microcontroller circuit.

 

In the microcontroller circuit we use ic 89s51 controller. Use of this is is to control the one or many relay logic and at the same time show the message on the lcd display. If no gas is detected then display shows a everything is ok . If the gas is detected then show a warning message on the screen and at the same time relay off the supply unit.

 

Logic circuit.

Gas sensor interface.

Schimtt trigger circuit.

Microcontroller interface.

Lcd interface.

Alarm  control

Relay on/off  control

 

 

 

IN the  gas sensor interface we use gas  sensor as a input logic. We attach one ic 555 as  with this sensor . Here ic 555 work as a monostable timer.  Sensor output is connected to the  ic 555 pin no 2 via npn transistor. Pin no 2 is a negative trigger ic. When sensor activate then positive output is available and  this positive output  is converted into  negative with the help of the NPN transistor. Output of the NPN transistor is now connected to the  pin no 2 of the ic 555. Pinno 4 and 8 of the ic 555 is connected to the positive supply. Pin no 1 is connected to the ground pin. Pin no 7 is the output pin. Pin no 6 and 7 is the time constant pin. Pin no 6 and 7 provide a time constant option. When ic 555 works then  output is available on the pin no 3 . Now this output is switching by the further NPN transistor.One led is also connected to the  transistor circuit. Output of the npn transistor is available on the collector point. This output  from the collector of NPN is  now connected to the microcontroller pin no 1 which is port p1.0. Pin no 40 of the  controller is connected to the positive supply. We supply a 5 volt regulated power supply on this pin. For regulated power supply we use one step down transformer  . Step down transformer step down the voltage from 220 volt ac to 9 volt ac. This ac is converted into  dc with the help of the rectifier circuit. Here we use two diode as a  full wave rectifier. Output of the rectifier is now converted into 5 volt regulated supply with the help of 7805 regulator. IC 7805 regulator  provide a 5 volt constant  supply to pin no 40 of the ic. Pin no 20 is connected to the ground pin.  LCD is connected to the port 0. Here we use 2 by 16 lcd for display. 2 by 16 means  2 line and 16 character.

 

Two output is available from the controller from port P2. One output is buzzer and second output    is relay output. Buzzer is on when  circuit sense a gas and  relay  switch off the supply chain.

 

To control a relay we use two transistor circuit. Output from the controller is  drive the pnp transistor through  1 k ohm resistor. Collector of the pnp transistor is connected to the npn transistor through 1 k ohm resistor. Collector of the NPN transistor is connected to the  relay coil  directly. . Here relay is for the switching purpose only . As the  transistor is on  relay is on and relay break the contact of supply  chain.

 

Component COST

 

 

 

S.No.

Item

Quantity

Rate/Unit

 Rate(Rs.)

1

MCU 89s51

1

80

80

2

RF module

1

600

600

3

HT12E

1

35

35

4

HT12D

1

35

35

5

IN4148

3

20

60

6

1M OHM

1

0.25

0.25

7

1K

5

0.25

1.25

8

IC BASE 18 PIN

2

5

10

9

IC BASE 8PIN

4

40

160

10

IC PC817

4

10

40

11

LEDS

10

1

10

12

PCB

1

800

800

13

Buzzer

1

25

25

14

Crystal

1

25

25

15

LCD

1

150

150

16

Microswitch

1

3

3

17

battery connector

1

10

10

18

convince Charges

1

1000

1000

19

STRIP LINE CONNECTOR

1

80

80

20

GENERAL PURPOSE PCB

1

60

60

21

470E

5

0.25

1.25

22

Push to On Sw

3

12

36

23

SOLDERING WIRE

1

25

25

24

SOLDERING IRON

1

120

120

25

FLUX

1

10

10

26

CONNECTING WIRE

1

50

50

27

TR548

2

2

4

28

TR558

0

2

0

29

RESISTENCES

20

0.2

4

30

CAPACITORS

 

 

0

31

1000f

2

10

20

32

100f

1

5

5

33

470f

4

5

20

34

DIODES

8

1

8

35

LED

8

1

8

36

Crystal 12MHz

2

25

50

37

IC BASE

1

5

5

38

IC 7805 Volt. Reg

2

15

30

39

TRANSFORMER 9 V

1

30

30

40

PLY BOARD

1

100

100

41

TAPE ROLL

1

10

10

45

Screws/bolt

2

2

4

46

Batteries

1

15

15

 

TOTAL COST

 

 

3720.75

 

ADVANTAGES

 

Low cost

 

Reliable

 

Portable

 

Flexible  due to microcntroller

 

Easy to use- system is very easy to understand

 

It wil also help in irrigation department for farmers to control temperature

Features-

 

Microcontroller 8051 or PIC controller

 

LCD display

 

Sensors

        Moisture

        LDR

        Humidity

        Pollution  sensor

        Temperature

 

 

 

Hardware required-

 

8051 programmer universal kit

 

CRO 20 Mhz

 

Digital multimeter

 

Software required:

 

Keil software- Microvision 2- we will use keil software to compile and

 

simulate  program file. We can write programming code in C or assembly language file

 

 

ORCAD for PCB design 10.5 we will design layout in ORCAD software.

 

Proteus for simulation 7.4 version- we will use proteus softw

 

 

Bibiliography;

 

www.rickysworld.com

www.ludhianaprojects.com

www.8051project.com

www.atmel.com