By

A . S. Powar & M . S . Salunkhe

Guide

Dr. B. P. Ladgaonkar

Prof. S. K.Tilekar

VLSI Design and Research Center Post Graduate Department of Electronics

Shankarrao Mohite Mahavidyalaya, Akluj Tal - Malshiras , Dist. - Solapur – 413 101

1. Introduction

A) Origin of the Problem

B) Aim & Objectives

2. Designing of the System

Hardware Co-design

3. Result and Discussion

4. Conclusion

It is found that, the humidity, CO2 in the polyhouse is not measured precisely with the help of unskilled person.

This may adversely affect the yield of the crops.

Therefore, it is found that this agriculture field is mostly demanding the sophisticated instrument to monitor the parameters of polyhouse.

Hence considering this fact and the social demands, it is proposed to develop an electronic system to measure the environmental parameters of polyhouse.

To study the architectural details of PSoC1.

To study the PSoC designer IDE.

To configure the hardware using PSoC1.

Co development of necessary software.

Implementation of the system.

Interpretation of result.

Polyhouse or Green house provides a controlled and

favourable environment for the crops to grow in all

seasons. The important parameters are:

Humidity

CO2

ADC FPGA Buffer Amplifier Weak

analog

signal

P rogrammable

S ystem

o n

C hip

PSoC Weak analog

signals

Block Diagram.

Configuration blocks for our

system.

CO2 sensor (MG-

811) &

Humidity sensor

(SY-HS-220)

PSoC 1 Device

CY8C29466 -

24PXI

LCD

1) Humidity sensor(SY-HS-220).

2) CO2 sensor(MG-811).

Features:- 1)Highly precise and

reliable.

2)Exhibit linearity over

30%

Rh to 95 % Rh.

3)The humidity sensor is

of

Capacitive type.

4)Provides DC output

voltage.

Features:-

1)Good sensitivity and

selectivity to CO2

2)Low humidity and

temperature

dependency.

3)Long stability and

reproducibility.

Overall chemical reaction：Li2CO3 + 2Na + = Na2O + 2Li + + CO2

EMF = Ec - (R x T) / (2F) ln (P(CO2))

Where, P(CO2) - CO2 partial Pressure, Ec - Constant Volume, R - Gas

Constant volume, T - Absolute Temperature (K), F- Faraday constant

• Configurable Analog Blocks

Implement ADCs, DACs, filters,

amplifiers,

comparators, etc.

• Configurable Digital Blocks

Implement timers, counters, PWMs,

UART, SPI, IrDA, etc.

• 4KB to 32KB of Flash memory for

program storage

• 256B to 2KB of SRAM for data storage

• M8C Microcontroller: 4 Million

Instructions Per Sec

PSoC Device Features:

Inputs : Each pin can sink 25mA

Programmable filters

Flexible sensor interface I/O

3 types of ADCs, up to 4

Processing :

Outputs : Each pin can source 10mA

Up to 16 PWMs, Timers, Counters

Up to 9-bit DACs, 14-bit ADCs

Support Functions : EEPROM

Sleep Options

Watch Dog Timer

Low voltage detect

Fast M8 Microcontroller Core

Multiply Accumulate

i = V/R

Q = CV

I average = Q/T = Qfs = CVfs

R equivalent = V/I average = 1/Cfs

Determine system requirements

Choose User Modules

Place User Modules

Set global and User Module parameters

Define the pin-out for the device

Generate the application

Review generated code

Demonstrate working configuration

ADCINCVR

LCD

PGA

Block Diagram of ADCINCVR

Vo =(VIN –VGND).(Ra/Ra+Rb)+VGND

Execute boot program:

--initialise general purpose resources;

--configure application specific

modules;

--initialise run time environment;

--disable interrupt;

call main application routine;

Void main()

{ Start system timers;

Initialise application specific

modules;

Initialise global variables;

Initialise application specific

channels;

Enable interrupts;

While(1)

{

Wait for events(Enabled interrupts);

Read values from input channels;

Execute control

procedure & compute

actuation data;

output actuation data to output

channels;

}

}

B) Application programme routine

A) Boot programme algorithm

Start

Initialization of

all modules

Get ADC reading

Get reading for CO2

Display reading

Convert in ASCII

Calibrate data for

Humidity

If

count<0x65(

200mv)

STOP

Display as Detected Display as Undetected

No Yes

Software Design Flow Of

Our System

A

Initialize ADC1

When ADC 1

Data Available

Display

Calibrate the Data

Convert in to ASCII

NO

YES

B

B

Initialize ADC2

When ADC

2 Data

Available

If Count

<0x65(200m

v)

Display as

Undetected

Display as

Detected

YES

NO

Return Return

c

Initialize LCD

Set LCD Position

Send Data To

Disply

Return

y = 0.0288x + 11.315

0

20

40

60

80

100

120

0 1000 2000 3000 4000

Series1

Linear (Series1)

Humidity(%Rh) Output(mV)

30 794

35 860

40 958

45 1092

50 1258

55 1458

60 1709

65 1894

70 2064

75 2224

80 2383

85 2547

90 2729

95 2935

System is designed for measurement of humidity and CO2 gas

The humidity observations shown by the system are highly reliable and

precise. Moreover, the presence of CO2 gas is also exhibited by the

present system.

System works successfully and gives the data regarding environmental

parameters very precisely.

Particularly for measurement of carbon

dioxide (CO2) gas concentration, the

calibration in the respective units is

required. However, presently due to

unavailability of CO2 gas chamber the

calibration of carbon dioxide gas

concentration is left as future work.