Presentation on theme: "REMOTE CONTROL OF DEVICES USING CELLPHONES"— Presentation transcript:
1REMOTE CONTROL OF DEVICES USING CELLPHONES Shuhab-u-Tariq (1SI03EC109)
2INTRODUCTIONTelephone operated device control circuit which enables switching ON & OFF of appliances through telephone lines.It senses the telephone ring.Automatically switches call to this system, after pre-defined rings.Switches ON/OFF the load depending upon the key pressed by the caller.
6RING COUNTER CUM SWITCHING UNIT This Section counts the number of rings and lifts the cradle automatically after pre-defined number of rings.IC 4017 is used to count the number of rings.The triggering action is carried out by relay driver circuit, which comprises of two Darlington transistors with a relay.
15LATCH & LOAD DRIVER SECTION This section executes the command send by caller by latchingthe load to previous state on/off.Terms and components used here:D flip-flop - It is incorporated in IC40132003-driver IC- High voltage and high current driver IC isused to drive low impedance relay.
16D flip flop an overviewD QCLOCKTRANSIENTDATASINCE LAST POSITIVE GOING CLOCK DATA HELD IN LATCHSTATE OF D INPUT CLOCKED TO Q OUTPUT ON RISING CLOCK EDGEFIG 3
18IC 4013VCC Q IN.Q2 CLK2 RST D SET2Q IN.Q CLK1 RST D SET GROUNDD.CHAR THERS C.VTG RST O/P TRGER GROUND
19CIRCUIT DIAGRAM Sw1 Q1 Q2 Q3 Q4 IC3 RL1 RL2 RL3 RL4 to Telephone Line 149131112IC1B867IC3214351516100GNDIC1A10IC2BQIC2AR1+5V+12VN/ON/CSw1RL1RL2RL3RL4to Telephone LineQ3Q4Input signlas
20POWER SUPPLY UNIT X 1 +12V 9V +5V 230AC C1 C2 C3 C4 IC1 7812 7805 D11
21CONCLUSION Low power consumption, and compact in size. From any distance appliances can be controlled, overcoming the limited range of infra-red and radio remote control.High reliability, due to the usage of semi conductors.