HOME AUTOMATION SYSTEM USING DTMF DECODER

HOME AUTOMATION SYSTEM USING DTMF DECODERBYAMIT KADYAN 10001003003AMIT KUMAR 10001003004AMIT SANDHU 10001003005GAURAV 11001003094INTRODUCTIONBLOCK DIAGRAM

APPLICATIONS1. Turning lights down / off at night.2. Operating outside lights3. Turning lights or radio on / off when someone approaches the house, simulating occupancy4. Operating television, hot water heater, kettle, toaster etc. ready for your use.5. Optimizing use of low cost electricity.6. Working with intelligent electrical white goods e.g. washing machine, fridge, microwave etc.

ADVANTAGES OF HOME AUTOMATION Remote Control SecurityFlexibility & Convenience Cost Saving

List of components used1. Regulated power supply2. Microcontroller AT89C513. Relays4. DTMF decoder IC (MT-8870)5. Crystal oscillator (3.579545MHz)6. Crystal oscillator (11.0592MHz)7. Resistors(220 ,4.7k ,10k )8. Capacitors(10f ,1000f)

REGULATED POWER SUPPLY

Microcontroller 8051pin diagram

Dtmf keypad layout

DTMF Keypad Frequencies(with sound clips)1209 Hz 1336 Hz1477 Hz1633 Hz697 Hz123A770 Hz456B852 Hz789C941 Hz*0#DMt8870 dtmf decoder chip block diagram

Pin diagram

Functional decode table

relaysA relay switch is an electrically operated switch that enables one circuit to be switched to a second circuit that is separate. A relay switch is commonly used to control low-power circuits that are controlled by one signal.