DTMF BASED APPLIANCES CONTROL SYSTEM FOR RURAL AND AGRICULTURAL
APPLICATIONS
Technical
Specifications:
Name of the
Project : DTMF Based Appliances Control System for
Rural and
Agricultural
Applications.
Domain : Embedded Systems
Microcontroller : AT89S52
DTMF Decoder : HT 9170B
Opto Coupler : MOC3021
TRIAC : BT136
EEPROM : 24C04
Software languages : Embedded
C, KIEL Compiler.
DTMF APPLIANCES CONTROL SYSTEM FOR RURAL AND AGRICULTURAL
APPLICATIONS
Abstract:
Now-a-Days Automation is
playing an important role in each and Every field such as Industrial, Home,
Rural and Agricultural Areas. Usually we used to control the industrial equipments by
manual operation, which increases the human effort and maintenance cost. In
order to overcome this problem, the system is designed to control
devices at remote place.
To
control the devices from remote place we are using a DTMF technique. DTMF (Dual
Tone Multi Frequency) is used which converts the desired frequency in to analog
signals which is received by DTMF Decoder and given to AT89S52 microcontroller.
The
microcontroller is used for switching the load equipment according to the frequency
received by the DTMF receiver by using a combination of MOC (Opto Coupler) 3021
and TRIAC (BT136) is used for Load driving. In case of any power failure
conditions to store the data we are using EEPROM of 24C04.
This
project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for
relay. 7805 three terminal voltage regulator is used for voltage regulation.
Bridge type full wave rectifier is used to rectify the ac out put of secondary
of 230/12V step down transformer.
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