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Remote controlled appliance switch circuit

Remote controlled appliance switch circuit

 

Description.

Here is a versatile remote controlled appliance switch that can ON or OFF any appliance connected to it using a TV remote.

 

IR remote sensor IC TSOP 1738 is used for recieving the signal. Normally when no signal is falling on IC3 the output of it will be high.This makes Q1 OFF.When a signal of 38 KHz from the TV remote falls on the IC3 its output goes low.This makes Q1 conduct and a negative pulse is obtained at pin 2 of IC 1  NE 555.Due to this IC1 wired as a monostable multivibrator produces a 4 Sec  long high signal at its out put.This high out put is the clock for IC 2 which is wired as a Flipflop and of , its two outputs pin 3 goes low and pin 2 goes high.The high output at pin 2 is amplified to drive the relay .For the next signal  the outputs of IC2 toggles state. Result, we get a relay toggling on each press on the remote.Any appliance connected to this circuit can be switched ON or OFF.

Circuit Diagram with Parts List .

remote-appliance-switch-circuit_ct.jpg

Notes.

  • Before wiring the circuit make sure that the carrier frequency  of the TV remote you have is 38 KHz.For that wire the sensor part only ,point your remote to the TSOP1738 and press any switch.If  out put of TSOP1738  goes  low them ok, your remote is of 38Khz type.Nothing to worry almost all TV remote are of this type.
  • You can use any switch because for any switch the code only changes,the carrier frequency remains same.We need this carrier frequency only.
  • Assemble the circuit on a good quality PCB or common board.
  • The appliance can be connected through NO or NC  and contacts of the relay .

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October 5, 2009 Posted by | circuit, project ideas | , , , , , , , , , | 3 Comments

Object Counter

Object Counter

Object Counter

Project Object Counter Block Diagram Project Object Counter Block Diagram 

 

 

 

The project presented here is based on world’s most powerful microco-ntroller based on intel’s mcs-51 family , generally known as intel-8051. We have used its derivative atmel-89c2051.

Operation:  A pair of 38khz transmitter and a receive is used to count the objects.

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Counts pulses are out from the 38khd receiver which are coupled to an opto coupler.  At pin 2 out put of the optocoupler is connected to microcontroller pin 8 p3.4.

Ic3 an optocoupler will receive incoming count pulse at pin3 and output from pin 5 is connected to p3.4 pinof the ic2 microcontroller,

Two line by 16 character on each line (2×16) is used in nibble mode and maximun count can reach upto 65536 there after it will reset to 00000.

SW1 is manual reset switch to make the counter to reset to zero.

 Circuit is driven by 9v 500m.a.  transformer connected to PCON1

Diode D1-D4 forms bridge  circuit C1,c2 and c3 are filter capacitors and are part of power supply section..

Ic1 7805 is 5v regulator ic to give stablised supply to microcontroller. Ld1 is a  power indication led. R1 controls the current flowing thrugh led LD1 Crystal X1  along with C5 and C6  gives the necessary clock to microcontroller.

Capacitor C4 and R2 gives the required reset pulse to microcontroller.

 

Construction: solder all the parts provided in the kit properly. First connect the jumper wires(links) before you solder the ic sockets. Donot solder integrated circuits directly on the circuit board , it may damage the ic since you my not be experianced soldering person. So solder the ic sockets first on the circuit board. Solder smaller components first like resistance and disk capacitors, assemble the complete kit one by one. Please make sure that there are no  short circuits left on to the circuit board. Connect the main supply wire with 230v ac pins at one end ,to the 9v transformer towards primary side to the other open end. . Primary side will have high resistance when checked with multimeter. Connect 2pin plug to the secondary side of the transformer(low resistance side)  plug the wire to main and check the ac voltage at the plug connected to the secondary of the transformer. It should be 9v ac. Now connect the plug   to the socket connected on to the circuit board. Power supply led ld1 will glow. Check the voltage at the output of the regulator. It should be perfactly 5v dc. Check the voltage at the power supply pins of all the sockets mounted on circuit board it should be 5v dc.

 

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October 5, 2009 Posted by | Object Counter, project ideas | , , , , , | Leave a comment

MICROCONTROLLER BASED PROJECTS(89C51) ieee,EMBEDDED

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  30. MICROPROCESSOR-BASED HOME SECURITY SYSTEM
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  61. AUTO BRAKING SYSTEM
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September 9, 2009 Posted by | Uncategorized | , , , , | 62 Comments

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A complete prepaid electricity system just like the cellular mobile service you use exactly how much u      pay  plus you can recharge any time

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August 25, 2009 Posted by | buyproject, project ideas, projects list, Uncategorized, VHDL PROJECT SYNOPSIS | , , , , , , , , , | 95 Comments

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August 3, 2009 Posted by | project ideas, Uncategorized | , , , , , , , , , , | 142 Comments

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