Presentation on theme: "REMOTE CONTROL OF DEVICES USING CELLPHONES"— Presentation transcript:
1 REMOTE CONTROL OF DEVICES USING CELLPHONES Shuhab-u-Tariq (1SI03EC109)
2 INTRODUCTIONTelephone 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.
6 RING 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.
15 LATCH & 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.
16 D 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
18 IC 4013VCC Q IN.Q2 CLK2 RST D SET2Q IN.Q CLK1 RST D SET GROUNDD.CHAR THERS C.VTG RST O/P TRGER GROUND
19 CIRCUIT DIAGRAM Sw1 Q1 Q2 Q3 Q4 IC3 RL1 RL2 RL3 RL4 to Telephone Line 149131112IC1B867IC3214351516100GNDIC1A10IC2BQIC2AR1+5V+12VN/ON/CSw1RL1RL2RL3RL4to Telephone LineQ3Q4Input signlas
20 POWER SUPPLY UNIT X 1 +12V 9V +5V 230AC C1 C2 C3 C4 IC1 7812 7805 D11
21 CONCLUSION 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.