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 receiving 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 .
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 then OK, your remote is of 38Khz type.Nothing to worry almost all TV
remote are of this type.
* You can use any switch of the remote 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 C contacts of the relay .
* Use a regulated 6V power supply for the circuit.
I had seen an error in your circuit it was no Zenner diode current limiting safty resistor.else Zenner can be damage by the high current.
the ic2 mentioned here is the CD4017, this is a decoded counter, could you please explain how it can work as a flipflop?
is it working correctly plzzz give me reply…….
i need to know about the details of ic CD4017.how it is working as a flipflop?
plz use a 7805 ic instead of zener diode
This is working !!
I tried it in bread board and succeeded. I soldered it on a PCB and i am using it with a remote. You can make your own remote( very very small) also. If you have any quires, contact me at arifuddin2007@gmail.com
plz reply , is it working 100% , anybody made this ?
plz reply . is it working 100 % , my mail ayan.animation@gmail.com
it is working guys. but you need little tweaking. becarefull with connections and transistor pins.
GREAT its working……….
there is a problem in my circuit
remote control of appliances.
circuit is completed,but there is a problem that load connected to the ckt is not showiing output…so please help me what to do…??
Hi Vinod Refer to Note and have you tried whether your remote control is respoding by checking for the out put of IC3 is going low. Check whether led D1 is flashing and D2 is changing from on to off with each press of the remote control. Check Q2 Connect a freewheeling diode (reverse biased) 1N400X series in parallel with relay coil of K1. With these checks you can solve the problem.
i have posted similar circuit which can be used to control home appliances. But it does not need the 555 timer. Using 100uF across the TSOP output is just enough to create a 1 sec delay. I have also designed TV Remote circuit which can control 8 devices using single receiver by using 1-8 remote keys. Check out my blog
arif-ece.blogspot.com
Arifuddin Sheik
Hi Arifuddin Sheik a nice blog. Your circuit 2 is quite simple. you have explained about the above circuit also nicely. yes NE555 is added for positive fail safe switching. your idea of using delay with acapacitor without the use of NE555 is also good. keep it up. thanks for your comments. readers can visit his blog on the following address. useful informations.
http://arif-ece.blogspot.com/search/label/TV%20Remote%20Control%20Circuit
this circuit is working fine but i have a small problem with this circuit..i have connected a ac motor as a load to the circuit and it is working perfectly ..but my problem is .. the circuit toggles state as soon as it is switched on .. i.e., if the motor is in running state when the power is switched off.. once the power resumes the motor will be in stop .. and vice versa.. i want the motor to be in off state irrespective of its state before it loses power…..
HI Raghu! I understand your problem. It happens only when you turn on and off your circuit very fast. It happens because the capacitor contains some charge stored even you turn off and it takes sometime to discharge completely. So, if it is large delay when switching the circuit, the problem cannot be seen.
thanx arif..