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.

  • Project Category : IEEE Projects
  • Project Year : 2014-2015
  • Department
  • M.Tech,
  • Domain
  • Embedded system,
  • Technology
  • C,
  • Avilable city
  • Hyderabad,

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