Introduction:
GSM based agriculture system is our major project. In this project we can control any electrical MOTOR through mobile or landline from any part of the country. We can use the different types of motors like AC as well as DC motor. This project is basically depending upon our mobile system. We are using DTMF circuit for this project at the input side of the project. We will use the another mobile set with this project to receive the input DTMF circuit.In this project one base unit is connected to the basic landline in parallel with the land line phone.. When we want to control any electrical motor through outer phone then first we dial the connected mobile no., bell is ringing and after few bell phone is automatic on and switch on the base unit to operate. Now we press the single digital excess code, if the excess code is ok then unit give a tone pulse and switch on the base unit. Now again we press the switch on/off code to on/off any electrical motor. With the help of this code unit is on and base unit give a acknowledge pulse for on and off separately. in this project we can control number motors and different electrical functions through mobile. This project is basically used in the various fields like agriculture systems, our residential areas to fill our water tank. There the various applications for this system.
DESCRIPTION:
Our project is divided into various parts:
1) DTMF CIRCUIT
2) MICROCONTROLLER AREA
3) RELAY DERIVE CIRCUIT
4) AC MOTOR
5) POWER SUPPLY
In the DTMF circuit we are receiving the dual frequency at the input of the project. For this dual frequency we are using IC 9170, IC 9370. We are connected the mobile connector with is circuit. It has four output and these are connected with IC 74LS154. This is 4:16 mux. The outputs of this IC is connected with our microcontroller. And our relay derive circuit is connected with the output port of microcontroller.
We are using a power supply area of +5 V for microcontroller.In this project one base unit is connected to the basic landline or mobile in parallel with the land line phone.. When we want to control any electrical motor through outer phone then first we dial the connected mobile no., bell is ringing and after few bell phone is automatic on and switch on the base unit to operate. Now we press the single digital excess code, if the excess code is ok then unit give a tone pulse and switch on the base unit. Now again we press the switch on/off code to on/off any electrical motor.
HARDWARE DESCRIPTION
DTMF DECODER.
In dtmf decoder circuit we use ic 8870 ic. IC 8870 is a dtmf decoder ic. IC 8870 converts the dual tones to corresponding binary outputs.
DTMF SIGNALLING. Ac register signaling is used in dtmf telephones, here tones rather than make/break pulse are used fro dialing, each dialed digit is uniquely represented by a pair of sine waves tones. These tones ( one from low group for row and another from high group fro column) are sent to the exchange when a digit is dialed by pushing the key, these tone lies within the speech band of 300 to 3400 hz, and are chosen so as to minimize the possibility of any valid frequency pair existing in normal speech simultaneously. Actually, this minimisator is made possible by forming pairs with one tone from the higher group and the other from the lower of frequencies. A valid dtmf signal is the sum of two tones, one from a lower group ( 697-940 Hz) and the other from a a higher group ( 1209-1663 Hz). Each group contains four individual tones. This scheme allows 10 unique combinations. Ten of these code represent digits 1 through 9 and 0. . tones in DTMF dialing are so chose that none of the tones is harmonic of are other tone. Therefore is no change of distortion caused by harmonics. Each tone is sent as along as the key remains pressed. The dtmf signal contains only one component from each of the high and low group. This significaly simplifies decoding because the composite dtmf signal may be separated with band pass filters into single frequency components, each of which may be handled individually.
Planning:-
First of all we selected the voting machine. But its seems old circuit that’s why we did not selected this project. then after it we selected mobile control project. In that there was lot to learn because it include micro controller circuit, RF technology. We spent three days on this project to collect its material. We showed this project to our HOD, but they refused this project . so we left the decision to make it. Then we selected the bank security using password and IR senosors.
Hardware required-
8051 programmer universal kit
CRO
Digital multimeter
Software required:
Keil software
ORCAD for PCB design
Proteus for simulation
ADVANTAGES
· Low cost
· Reliable
· Portable
· Flexible due to microcntroller
· Easy to use- system is very easy to understand
Features-
Wireless system
LCD display
GSM technology
Hardware required-
8051 programmer universal kit
CRO
Digital multimeter
Software required:
Keil software
ORCAD for PCB design
Proteus for simulation
COMPONENTS REQUIRED:
MICROCONTROLLER 89C051
DTMF DECODER CM8870
DECODER IC 74LS154
IC 4049
RELAYS- 180 OHM 12V
RESISTANCES- 100OHM,22K,220K,330K
CAPACITORS- 1000µF,470µF,33PF,1µF
TRANSFORMER 12 V
REGULATOR- 7805
TIMER NE555
DECADE COUNTER IC 4017
ELECTRICAL SWITCHES
PLYBOARD
COPPER CLAD BOARD
FECL3
AREA OF APPLICATION:
1) In our agriculture field
2) In our residential areas
