15-02-2013, 11:18 AM
Mobile Phone With DTMF TECHNOLOGY CONTROLLED IRRIGATION/AGRICULTURE MOTOR CONTROL SYSTEM
AGRICULTURE MOTOR.pptx (Size: 575.05 KB / Downloads: 49)
introduction
The main objective of the project is to control the functioning of the industrial/ agricultural load using wireless technology.
One cell phone will send digitized commands to another cell phone which is in auto answering mode at the receiving end.
The receiving cell phone codes are fed to the microcontroller which is programmed to recognize those codes for operating any kind of load duly interfaced as per the sent commands from the senders mobile
The receiving cell phone codes are DTMF (dual tone multi frequency) decoded.
DTMF Decoder will identify the key frequency and convert that frequency to digital codes which are then fed to the microcontroller.
Power supply
The 230V AC supply is first stepped down to 12V AC using a step down transformer.
This is then converted to DC using bridge rectifier.
The AC ripples is filtered out by using a capacitor and given to the input pin of voltage regulator 7805.
At output pin of this regulator we get a constant 5V DC which is used for MC and other ICs in this project.
Dtmf decoder
This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone.
Two distinct frequency tones make up the DTMF(dual tome multiple frequency), and hence the name.
The dialer and the telephone exchange communicate one way through the DTMF communication.
The tone generator and the tone decoder consist of a complete communication setup.
Working of project
The mobile is connected to the DTMF decoder IC and a call is made to data mobile from another mobile.
When the network path is formed, any mobile key is pressed.
If 5 is pressed then this tone is decoded and the motor starts working
If 2 is pressed then this tone is decoded and the motor stops working
Conclusion:
Thus by using DTMF technology and microcontroller the loads can be operated from any place.