BY SRAVANI.K

VISHNU VARDHAN.RHARISH.CHKARTHIK.P

INTRODUCTION Wireless agro device control system is

designed by keeping in mind about the farmers of our India .This system will help them to work with their electrical appliances wirelessly with ease and comfortably.

BLOCK DIAGRAM

COMPONENTS HARDWARE:

AT89C51 Micro controller LAB TOOL-48UXP ADAPTER: INPUT 100V-300V ac

OUTPUT 5V-3A dc

RS 232MAX232MOXA NPORT 5110 (SERIAL TO ETHERNET CONVERTER) D-LINK 2100 AP(ROUTER)SOLID STATE RELAY

SOFTWARE:KEIL uVISION 4.0LAB TOOL 48UXP SOFTWAREEMBEDDED C PROGRAMTCP/IP CLIENT PROGRAMPCOMM TERMINAL EMULATOR

ATMEL 89C51

The AT89C51 provides the following standard features: 4 Kbytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator and clock circuitry.

Components:

About RS 232:A popular way to transfer commands and data between a personal computer

and a microcontroller is the use of standard interface, like RS232.The protocol RS232 defines the signals used in communication, and the

hardware to transfer signals between devices.The standard defines voltage levels V(0) to be at least +5V at the

transmitting end of the line TX, and can be degraded along the line to become at least +3V at the receiving and of the line.

Similarly voltage level V(1) must be at least  5V at TX, and at least  3V at ‐ ‐RX.

The standard also defined the upper limit for these voltages to be up to ±15V. Logic high is transferred as V(0).

The microcontroller cannot handle such voltage levels, so typically a voltage level translator is inserted between the microcontroller and the connector where the RS232 signals are available.

MAX232 PIN OUT:

About MAX232:The MAX232 is an IC, first created in 1987 by Maxim Integrated Products, that

converts signals from an RS-232 serial port to signals suitable for use in TTL compatible digital logic circuits.

The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals.

It is helpful to understand what occurs to the voltage levels. When a MAX232 IC receives a TTL level to convert, it changes a TTL logic 0 to between +3 and +15 V, and changes TTL logic 1 to between -3 to -15 V, and vice versa for converting from RS232 to TTL.

The MAX232(A) has two receivers (converts from RS-232 to TTL voltage levels), and two drivers (converts from TTL logic to RS-232 voltage levels).

This means only two of the RS-232 signals can be converted in each direction. Typically, a pair of a driver/receiver of the MAX232 is used for TX and RX

signals, and the second one for CTS and RTS signals.

SOLID STATE RELAY UNIT

About SSR:A solid-state relay (SSR) is an electronic switching device

that switches on or off when a small external voltage is applied across its control terminals.

SSRs consist of a sensor which responds to an appropriate input (control signal), a solid-state electronic switching device which switches power to the load circuitry, and a coupling mechanism to enable the control signal to activate this switch without mechanical parts.

The relay may be designed to switch either AC or DC to the load. It serves the same function as an electromechanical relay, but has no moving parts.

MOXA NPORT 5100(SERIAL TO ETHERNET CONVERTER)

About MOXA: This 1-port Serial to Ethernet (also called a serial device server) has one

RS232 port and can be used for most basic and advanced applications;1-port Serial RS232 to Ethernet converter

High performance and reliability MOXA brand

Many advanced features and functions

Indication LED lights

Virtual COM management software included

Management software works with Windows and Linux

Power supply included

D-Link

About D-link:It’s best to use a computer (with an Ethernet adapter) that is connected

to a switch for configuring the DWL-2100AP. The default IP address for the DWL-2100AP is 192.168.0.50 with a

Subnet Mask of 255.255.255.0. We will need to assign your computer a Static IP address within the

same range as the DWL-2100AP’s IP address for the purpose of configuring the DWL-2100AP.

Lab tool-48uxpUSB or parallel port interface with auto-switch powerSupport 5V and 3.3V low voltage devices, 1.8V chip support through low voltage adapter.Less then 2 seconds per Mbit Programming speed for high density flash chip.

No adapter required for DIL chip up to 48-pin48-pin universal pin driver and current limitAuto-sense/ Self programming with statistical reportDevice insertion /continuity checkUniversal adapter for 44-pin PLCC/ QFP/ TQFP/PSOP and 40/48 TSOPSupports OS : Windows 95 / 98 / ME / NT / 2000 / XP / Vista(32bit) / 7(32bit) (Parallel port)

PROCEDUREFirst take AT89s52 microcontroller and dump the program in it by using the

kit LAB TOOL UXP.Make the hardware connection as follows: connect the crystal oscillator and reset switch to microcontroller . connect max232 to microcontroller for converting TTL to RS232

voltage. connect MOXA(serial to ethernet converter) to MAX232. connect ROUTER(D-LINK) to MOXA.

• Now write client TCP/IP program in client like laptop or pc. Define the server(MOXA) ip address and port number in the program.

ADVANTAGESWireless agro device control system is benificial in the ways like:

::: protecting the people working in farm fields from getting electrical shock when coming contact with electrical equipments like motor etc.

::: farmer can perform multitasks rather than wasting time in only one work like switching on and off according to its requirement.

FUTURE SCOPENow we are using the technology of server and client TCP/IP

protocol through wifi.We can futher implement it by using WHITE FI wireless

internet available in rural areas in future.

White-fi is a term being used to describe the use of a Wi- Fi technology within the TV unused spectrum, or TV white space.

CONCLUSIONWireless agro devices control system is not only for the farmers

but can be applied in any field of agro like poultry , hatchery, dairy farm etc…

This application can also be useful in the process of making DIGITAL INDIA.

THANK YOU.