In this write up we discuss how to build a simple infrared remote control circuit for controlling a given electrical appliance through any ordinary or TV remote control unit.
Introduction
Controlling household electrical gadgets or any electrical equipment remotely can be fun. Controlling gadgets like a TV set or a DVD player through a remote may look pretty common to us and we are very used to with the experience, however for controlling many other domestic equipment like a water pump, lights etc we are compelled to walk around for implementing the switching.
The article is inspired by our usual TV remote concept and has been applied for controlling other house hold electrical appliances remotely. The circuit facilitates and helps the user to do the operations without moving an inch from his resting place.
The whole circuit of the proposed IR remote control may be understood by studying the following points:
Referring to the figure, we see that the entire layout consists of just a couple of stages viz: the IR sensor stage and the fkip flop stage.
Thanks to the highly versatile, miniature IR sensor unit which forms the heart of the circuit and directly coverts the received IR waves from the tranamitter unit into the relevant logic pulses for feeding the fllip flop stage.
The sensor basically consists of just three leads viz: the input, the output and the biasing voltage input lead. The involvmant of only three leads makes the unit very easy to configure into a practical circuit.
The sensor is specified for operating at 5 volts regulated voltage which makes the inclusion of the 7805 IC stage important. The 5 voltage supply also becomes useful for the flip flop IC 4017 and is appropriately supplied to the relevant stage.
When a IR signal becomes incident over the sensor lens, the inbuilt feature of the unit activates, triggering a sudden drop in its output voltage.
The PNP transistor T1 responds to the negative trigger pulse from the sensor and quickly pulls the positive potential at its emitter to the collector across the resistor R2.
The potential developed across R2 provides a positive logic high to the IC 4017 input pin #14. The IC instantly flips its output and changes it’s polarity.
The transistor T2 accepts the command and switches the relay according to the relevant input provided to its base.
The relay thus switches the connected load across its contacts alternately in response to the subsequent triggers received from the IR transmitter unit.
For the sake of convenience the user may use the existing TV remote control set unit as the transmitter for operating the above explained control circuit.
The referred sensor is well compatible with all normal TV or DVD remote control handset and thus can be appropriately switched through it.
The entire circuit is powered from an ordinary transformer/bridge network and the entire circuit may be housed inside a small plastic box with the relevant wires coming out of the box for the desired connections.
The following parts will be required for making the above explained infra red remote control circuit:
R1, R3 = 100 ohms,
R2 = 100K,
R4 = 4K7,
R5 = 10K,
C2 = 47uF/25V
C1, C4= 22uF/25V,
C6 = 4.7uF/25V,
C3 = 0.1, CERAMIC,
C5 = 1000uF/25V,
T1 = BC557B
T2 = BC547B,
ALL DIODES ARE = 1N4007,
IR SENSOR = TSOP1738 image: Vishay
IC1 = 4017,
IC2 = 7805,
TRANSFORMER = 0-12V/500mA,
Prototype image courtesy: Raj Mukherji
WASIM KHAN says
Does it Work For Digital kWh Meter?
Muhammad Junaid says
😀 😀 Great Question asked by Wasim Khan…!!!! He wants to make his digital home electricity meter to be controlled by remote, Switch OFF whenever he wants
Mirza Adeel says
We are Pakistani… 😀
Anonymous says
can this remote control control any smaller stuff like LED, 7 segments, buzzer.. just to show the usage of remote control?? can?
Anonymous says
where is the schematic diagram for the transmitter i can only see the reciever
Swagatam says
You may use a TV remote as the transmitter…….
Navin Jones says
wer cn i get hat relay?? nd wt is relay in dat circuit diagram??
Swagatam says
Relay is used for transferring power from low to very high levels.
You can get it from any electronic parts retailer.
ADHARVA ADINATH says
hi sir,
I have assembled and this and working ok.But some problems observed and because of that i have not connected the relay to any equipment yet. pls help me to solve these problems.
In darkness relay is switcing on and off frequently automatically.if there is light it is working ok. ac mains given to this unit is from a plug point on a common switch board in my house.
when i switch on a CFL switch near to this plug, relay is getting on or off.but if i switches a fan or other equipment on same switch board, nothing wrong happening.when i switch on a CFL in any other room, nothing wrong happening. This units malfunctioning only when we switch on the CFL connected near to this power point. what will be the reason?
pls reply a solution for these 2 problems.
Swagatam says
Hi Adharva,
You may cover your circuit in a suitable box making sure your IR sensor is protected from all ambient light sources. Make a tiny hole from where only signals from your transmitter reaches the sensor….. may be this solution will help to solve the problem.
You may also refer this circuit if the above solution does not work.
http://www.rentron.com/Files/IR-D15A.pdf
ADHARVA ADINATH says
hi sir,
thanks for your prompt reply. Actually I have already tried maximum possible ways . when put in a non transparent box,with sensor hole, same thing happens.when i totally cover the CFL and switch on,again same thing happens. Means ,whenever i switch on and off the nearby CFL switch, RELAY also responding accordingly.N0 connection mistake or dry solder found.voltage also is ok. Replaced TSOP with new one but no use.I have been thinking of the reason for this but still a mystery.
thanks
Swagatam says
I am not sure how to rectify this issue, try operating the circuit with a battery 12v instead of transformer adapter, or may be with an SMPS supply and see what happens.
otherwise you may have to go for the circuit given in the previous comment.
ADHARVA ADINATH says
Hi sir,
the problem is not yet solved. but i find out what is the cause by searching many informations from NET . I assume the following are the reasons for that. TSOP 1738 is sensitive to ballast fluorescent lamp light. also IC 4017 is sensitive to static electricity.this both combines malfunctioning of this circuit,while switching on a cfl lamp. But how to rectify this issue? in TV also TSOP 1738 are there. but not malfunctioning with the effect of cfl light. Could you pls help by finding a remedy for this?plsssssssssssss
Swagatam says
Hi Adharva,
TV receivers use special filter circuits which allow the IR sensor to respond to only the waves from the remote. All other forms of frequency gets blocked by the filter, therefore a TV responds only to the specified remote control.
You can buy a readymade IR tester unit, which are used by electronic retailers for checking TV remotes while selling to customers. Just buy one such unit and see what it contains. The unit can be easily converted into an effective IR remote control circuit.
Anonymous says
can we use flipflop instead of 4017 ic.. and why.?? what changes we get by using flipflop
Swagatam says
yes any flip flop can be used in place of the IC4017 which is also a kind of flip flop here, for toggling the load ON and OF alternately…
Anonymous says
dear sir,
this ckt is working thanks.my problem is relay is responding to the frequent power failure . ie, when the home appliance controlled by this ckt is in off condition and once power is gone and come back, relay is switching on automatically and home appliance starts working.for trial and error,i switch off and on the power to transformer again and again, and observed 4017 getting pulse in each switch off and switch on. can you suggest any idea for keeping the relay in same state when power goes and come back?pls. as Mr atharva said, this ckt is responding to cfl light also.i have minimized this problem by covering tsop with a broken sun-glass piece.but not eliminated fully.
Swagatam says
You can do the following mods:
Connect R4 to pin#2 of the IC, keep pin#3 open.
Connect pin#4 and pin#15 with a 10K resistor and connect a 0.47uF capacitor across positive and pin#15.
This should hopefully solve the problem.
Anonymous says
thank you very much for the immediate response. you are really great. i never experienced such a prompt reply from any other sites.. pls keep it up. so that it will be very help full for many people who are interested in electronic experiments like me.before i used to sit many months for getting an information related to my doubts on my experiments.now i have the confidence that you are there. god bless.. i will modify this ckt as per your suggestion and let you know the result
Swagatam says
You are most welcome!!
Anonymous says
Dear sir,
I have tried the modifications as suggested.i dont have 0.47uf capacitor in hand. so i tried with 1uf . but still the same problem observed. Is 0.47 uf compulsory? if so i will buy that and try with that. Thanks…
Swagatam says
Did you do the other things also?
Connect R4 to pin#2 of the IC, keep pin#3 open.
Connect pin#4 and pin#15 with a 10K resistor.
1uF will also work, but the above two things are compulsory.
Anonymous says
yes sir, all other said modifications are done. any additional circuit required to eliminate this problem? can you pls help?
Swagatam says
No, the above modifications will 100% stop the circuit from activating during power switch ON.
When power is switched ON, voltage will momentarily pass through the 0.47uF cap to pin#15 of the IC, and reset the circuit such that the output stays at pin#3 which is the start pin of the IC. Since nothing is connected at pin#3, the transistor and relay will stay switched OFF, bcoz pin#2 will be at zero voltage then.
Disconnect R3 from the sensor and then check the switch ON functioning….
Anonymous says
dear sir,
all modifications i made but don't know why the modifications not working successfully. i hope you are clear about my problems. i have connected this to my ceiling fan. when fan is in on condition and power goes ,and come back after a short time, fan will not work again. any way it is ok. but when fan is in off condition and power goes and come back after short time ,fan get automatically on. this creating problem because when we are not at home and once power goes and come, fan starts working without any remote press. if i connect a battery as power supply ,every thing is fine because 4017 always getting power from battery.i dont have that much knowledge to solve this issue . So pls pls give me a solution if i am not bothering you. sorry.
Swagatam says
I think you should convert the circuit into a light operated remote control and then control it with a flashlight, in that way the circuit would become absolutely foolproof, with an IR sensor you may have to employ more sophisticated circuit than this, no other solution.
Or simply add a small battery back up to the circuit, a 9V small battery back up will keep things control.
You can do it in this way:
Disconnect pin#16 of the IC from C3/C4/IC2. Connect pin#16 back via a diode 1N4148 or 1N4007. Cathode to pin#16 and anode to C3/C4/IC2 points.
Connect another 1N4148 diode (cathode) to pin#16 and connect the anode to the positive of a 9V PP3 battery, connect the negative of the battery to the negative of the circuit.
186 says
similar circuit given in electronicsfor you magazine website, with modification is to use, variable POT of 470K instead of 220K GIVEN there as filter, decreases the frequency and sensitivity to responds to ambient light and then use proper box/shield, works 100% cheers…
Anonymous says
ok sir thanks very much.keep posting more circuits.seems something special on your site.very legible & very useful for a person like me. thanks a lot
Anonymous says
hello sir,how r u?
i hv 2 questions,
can i use ne555 ic instead of cd4017 in same circuit,bcoz ne555 seems 2 b simple with 8 pins,?
or minimum how many Milliamps is required 4 working of 6v dc relay,
above matter is that my multimeter shows 6V DC at terminals but 6V dc(checked,working) relay wont b operated by these terminals voltage,,is there a current issue or not?
Swagatam says
IC555 can be used, but how will you make to toggle ON/OFF (flip/flop) with subsequent triggers?
I did not understand you second question….what is the supply voltage and current that you are using??
Anonymous says
by connecting R5 C6 of above circuit to the trigger and threshold pin of 555
but i think i am wrong,bcoz i have checked this
to the second,,,i am supplying 6V DC and current500mA by adapter but after voltage crossing transistor(T1) relay is not working in circuit and my multimeter shows same 6V dc at this point(after crossing T1) as showing above,,,in addition to it by direct connecting relay to same above source it is working
Swagatam says
1) 555 cannot be toggled ON/OFF with single input source, so according to me it won't work as a flop flop.
2)T1 will not amplify the sensor voltage enough for operating a relay, that's why T2 has been introduced, so that a relay can be operated.
Anonymous says
Sir my circuit is not changing or on off due to remote controll switch what can i do
Swagatam says
connect an led in series with R2 and ground and check if it's illuminating or not when you switch the handset.
Bibin Edmond says
Hi swagatam,
Can we use a 4v 1ah battery for this circuit ? i dont need the relay. i just want to switch on and off, 6Nos (8mm) white leds connected parallel to the same 4v supply..? what modifications do i need for the above circuit.. ?
Swagatam says
Hi Bibin,
You can connect the LEds at the points where the relay coil is connected. Use a 8050 transistor in place of BC547, and use 30 Ohms resistors in series with the LEDs.
Bibin Edmond says
Hi boss,
y a 8050 transistor instead of bc547 ? is that a powerful one.. ?
Swagatam says
yes it's 10 times as powerful.
patel deep says
can this use in rc car
Swagatam says
try this circuit:
https://homemade-circuits.com/2013/02/how-to-make-infra-red-ir-remote.html
M. Naveed Iqbal says
hi
i am making a TX and RX using PT2272 and PT2262. PT 2262 is generating oscillations at 38.17 kHz (measured using scope). I am getting frequency 38.17 kHz at DOUT pin of PT2262 and IRED Tx cathode. but not receiving at out pin of TSOP1738. I changed IRED Tx two times but facing same problem. Please help.
Swagatam says
Hi,
Test your receiver with an ordinary TV remote control handset, if it doesn't respond still would mean that either the sensor device is faulty or configured wrongly….
Tushar says
is it interface with the microcontroller?
Swagatam says
no microcontroller used here
Aman Verma says
Sir,
what are the relay pins connections in the circuit ?
Swagatam says
N/O is connected to the load.
sharojalhasan says
PLZ HELP ME PLZ HELP ME . I WANT A RESPONSE.
sharojalhasan says
CIRCUIT WORK PROPERLY ?
Swagatam says
circuit work properly? yes
sharojalhasan says
THANK YOU . IN TV REMOTE WICH BUTTON ON Or OFF FOR CIRCUIT ?
Swagatam says
all buttons will work.
sharojalhasan says
GIVE ME A CIRCUIT LIKE WHEN LIGHT PRESENT RELAY OFF .IN DARKNESS RELAY ON . Plz help me.
Swagatam says
check out this circuit:
https://homemade-circuits.com/2011/12/super-simple-light-activated-switch.html
Subrat Saxena says
hello sir,
i want to know that if i want to use this for my rc plane then what should i do..?
Swagatam says
this circuit won't work with RC planes.
Subrat Saxena says
hello sir please help me make this circuit , i m very new to this cool thing n i want to learn it at any cost… now i have assembled all the required parts as mentioned in your list above.. but i m not getting what is LOAD here ? and plz tell me how to ground in above circuits at required places? and yes what is relay here..?? and plz tell me how that oscillator is formed which is connected to mains and load?and yes what is grid ? plz plz help me help me…nationality k khatir.. 🙁
Swagatam says
hello Subrat,
load is the appliance which you would like to control, like a amp , a fan etc.
the ground points are actually the supply negative line. all of these will connect with the negative supply rail.
for knowing about relays, you may refer to the following article:
https://homemade-circuits.com/2012/01/how-to-understand-and-use-relay-in.html
I can't find the word grid, oscillator etc in the above article?? anyway, grid it means the AC utility line, which provides mains AC in our homes.
sharojalhasan says
HOW MANY VOLT AND AMPR NEED FOR THIS CIRCUIT ?
sharojalhasan says
IN REMOTE CIRCUIT WHAT IS VSS AND GRN ?
Swagatam says
(+), (-)
Unknown says
Hii sir .,
i assembled this circuit but it didn't work pls hep me sir……
sharoj alhasan says
WHERE THE DC (-) POWER SUPPLY GIVEN ? In this circuit ?
Swagatam says
ground points
sharoj alhasan says
WHERE (-) DC INPUT ?
sharoj alhasan says
HOW MANY mAh NEED FOR THIS Circuit ?
sudeep says
hello sir,
I have made the circuit as showed in the circuit diagram on a bread board for conformation actually i dont have pcb or grid to put on… When i connected a load (small bulb220v). At the very first time its responding for the power no/off switching mode as one of the above person said but thats not a problem to me as i have no power failure. But when i use my tv remote to switch on its ok but after that its not responding, ie. At the very first time its responding and then its not responding i tried many times and if i restart the supply and try then its working and then also for the only first time. Totally only 2times load is changing its state 1st when we on the mains and 2nd by remote . Whats the actuall problem is there any min time required for the circuit for every input. Help me out with this plz. Thanks in advance.
Swagatam says
hello sudeep,
please see the first figure given in this article, change your 4017 output connections as per the configuration given in the following diagram, don't change anything else only change the output connections of 4017 which are shown with the diodes and the relay driver stage.
https://homemade-circuits.com/2011/12/make-simple-electronic-clap-switch.html
siyami91 says
sir can i use load voltage instead of transformer(230V to 5V using with resistor and diods)
Swagatam says
I did not understand your question.
sharojalhasan says
how many mAh need for this circuit ?
Swagatam says
100mA
Anonymous says
can we use a specific transmitter?except tv remote…
please upload its circuit too…
Swagatam says
you can try the second circuit from this link:
https://homemade-circuits.com/2013/03/simple-reliable-infrared-ir-remote.html
maria says
Hello Sir, we have to make this IR remote control for receiving part in our final year project. Our fyp is "Room automation system for disabled persons" in which we have to control electronic equipments like light, fan,AC and non electronic equipments like door, curtain etc…. we have to open/close these mentioned equipments…. so can this remote control circuit given by you can be useful in our project??? please guide me and if any modifications needed, do tell about them. and can u give the code that is burnt in the controller ic in above circuit? waiting for your prompt reply anxiously… thanks. 🙂
Swagatam says
Hello Maria,
Te above circuit is not so reliable. I'll recommend using LM567 IR remote circuit as shown below:
https://homemade-circuits.com/2013/03/simple-reliable-infrared-ir-remote.html
maria says
Thank you so much Sir for your prompt reply 🙂 Sir,actually controlling light/fan/ac is somewhat easy but closing/opening doors, windows and curtains is not so easy, it will require motors and some complications will be involved for achieving this furthermore we have to include temperature/humidity and light sensors also. So i am confused how will I achieve all of this. Please guide me how should I start up. I have to implement my project using Micro Pro C, MP lab, Proteus. And our project involves 3 main parts: 1)Communicate IR sensors with micro controllers. 2)Communicate wirelessly micro controllers with other micro controllers. 3)Communicate wirelessly motors with micro controllers.
Hopefully waiting for your help Sir.
Swagatam says
You are welcome, I wish I could help you with all those stages, however the mentioned stages appear quite complex and are not within my easy reach, so I am sorry I won't be able to go beyond the IR remote control stage explanation.
maria says
ok Sir no problem if it's beyond your reach… then sir give me a detail explanation of IR remote control working so that I can explain it in my presentation…the questions that may be asked from this topic, brief me about them in document type link. thanks
Swagatam says
I have already explained it elaborately in the above article, if you have specific questions you may ask them, I'll try to clarify them.
sharoj alhasan says
SIR PLZ GIVE ME A EASY FLASHING CIRCUIT VERY EASY PLZ
Swagatam says
try this one:
https://homemade-circuits.com/2011/12/how-to-make-single-transistor-led.html
farhan says
SIR PLZ GIVE ME A CIRCUIT WICH CAN FLASH 12 VOLT LAMP PLZ SIR
Swagatam says
try this one:
https://homemade-circuits.com/2011/12/build-simple-how-to-build-universal.html
Anonymous says
sir tell modifications in circuit which controls fan speed by volume up/down buttton of tv remote control
Swagatam says
i'll try to find it
maria says
sir,plz give us a simple mini project of optical communication .. i am waiting for ur rply.. thanks…
Swagatam says
Hi Maria, pls provide full details of your project requirement, I will try to help.
Anonymous says
Sir, do u have any idea about zigbee? i have to make a project on room automation system using zigbee, can u please help me?
Swagatam says
I am sorry, I don't have much idea about the concept.
Anonymous says
Is there the diffrence between programming of 16f877 and 16f877A and 16f887? can i use the same code for all these in microC?? or which one is the best for easy code/programming in microC
Swagatam says
don't have much idea about PICs, sorry….
Anonymous says
how can i glow an led using IR sensor(transceiver) instead of button?
please provide the code and circuit diagram….thanks
Seok Sothea says
i have made this circuit. everything is well i tested, but tsop. the output still high even i press remote to it…. everytime i power it on. the relay active (connected to pin 2 of 4017). what wronge sir…please help..!
Swagatam says
connect a 10k resistor between pin4 and pin15 and connect a 0.22uf or any close value cap across pin15 and positive…see if it helps.
Seok Sothea says
i found the problem sir..when i test the circuit without tsop1738. it works well. so, i try to replace tsop1738 with tsop1138. it works well even under day light or cfl lamp. i use it to control the 220v 1500w chickent washing machine and work with only a cheap cell phone charger as power supply..it is very useful sir…thank much.
Swagatam says
OK great, thanks!
Anonymous says
can this circuit turn on or off any digital KWH meter when i will desire to do that
Swagatam says
yes, but there shouldn't be any obstacle in between….
Muhammad Ahsan says
sir plz sort out my project …………..
Girish Radhakrishnan says
hi sir…i am girish. i didn't get the phototransistor TSOP 1738, but in my area TSOP1838 is available .can i use that here…but i didn't get the pin configuration on internet…so can you help me???
Swagatam says
Hi Girish, you can use it in the above circuit,
pin2 is ground, pin1 is output and pin3 is Vs(supply)
the image is shown, hopefully it's correct:
http://www.fact4ward.com/blog/wp-content/uploads/2012/08/tsop1838.gif
Parthi Ban says
hai sir i want to control many load pls help me sir
Swagatam says
with the above simple design only one load can be controlled.
Parthi Ban says
sir i need a relay range
Anuj Wagle says
HI swagatam ….
please help me .. is that a 12v relay or a 5v relay..
Swagatam says
Anuj, it's a 12v relay
Stavan Karia says
Sir, can you please suggest a circuit for the below mentioned purpose.
"Current must flow in one direction and the amount must be controlled by a regulator (like in ceiling fans). And on moving the regulator in another direction the current must flow in another direction."
Swagatam says
Sorry Stavan, the given data is not sufficient, pls provide more precise information
rahul says
Hi Swagatam,
As Parthi Ban quoted the requirement of many loads, is it possible to use uC for the same? But for that we need to diagnose which button on Remote was pressed, can we detect that? (using the circuit you provided or any other).
What's the difference between IR and RF wireless communications? (w.r.t. the current purpose).
I definitely want to use uC, please suggest which one should i choose. say for controlling a minimum of 6 loads.
Can you help in uC also?
Anyways great job Dude !!
Swagatam says
Hi Rahul,
Thanks!
A uC may not be needed for controlling more loads, it can be done by using separate receivers for each load and with a transmitter handset having individual buttons, just as we have in TV remotes.
I would be addressing one such design soon in my blog.
Swagatam says
IR is Infrared and Rf is Radio frequency, IR cannot pass through walls, Rf can.
Abhishek sharma says
Sir ,
can i have circuit diagram for 'REMOTE CONTROLLED SWITCH BOARD' . through this i can operate 2 lights , 1 fan, 1 AC, 1 TV.
Abhishek sharma says
hi Swagatam ,
i want to make "remote controlled switch board" through which i can operate 4-5 appliances bye remote control. so please suggest me circuit diagram with detail.
Swagatam says
Hi Abhishek,
You will see this circuit soon in my blog….keep in touch
Abhishek sharma says
thank u sir,
i wil follow ur posts.
Partha P Baruah says
Sir, in the design you have used a relay.What kind of relay is it?And what is the source of supply?
Swagatam says
It's 12V, 400 ohms, SPDT, you can see it in the image below. the square orange colored block is the relay
Partha P Baruah says
Sir, in the remote control circuit the feed is only 230Vac.What will be the relay rating?In this circuit there is no need of any external DC supply.Please help.
Swagatam says
Partha, the power supply is clearly shown at the top section of the circuit using a transformer, bridge network….the green color box is the relay coil.
Partha P Baruah says
Sir ,this means the relay will work in 12V dc which will be fed from step down transformer and the bridge.Please help me to understand .Thanks.
Swagatam says
yes that's correct
Partha P Baruah says
Sir, one more doubt about the value of R4 .Is it 4K7?
Swagatam says
yes it's 4k7 = 4.7k
Srishan Perera says
Hii sir is there any possibilities of using a transformerless circuit for this circuits power supply? I know its critical but I want to makes rhings more compact in a box thank you. 😀
Swagatam says
Hi Srishan, you can try the one that's shown in the following article:
https://homemade-circuits.com/2011/12/cheap-yet-useful-transformerless-power.html
put two zeners in parallel if possible for better safety.
use 15V/1watt zeners
ani a says
dear sir
i connect circuit as shown in diagram but it will not working. sir ir sensor have a 2 terminals but in diagram it have 3 terminals. so i can not connect the irs to gnd and where i connect the remaining pins of ic 4017 please tell me sir
Swagatam says
dear ani,
you must use the one that's referred in the diagram.
see the prototype images for getting the idea of the sensor type and appearance
ani a says
dear sir,
i connect the irs as shown in diagram but it is not working.sir please tell me the voltage or current across the components and is their any problem if relay inputs are change. how i check the relay whether it is working or not
Swagatam says
Dear Ani,
first make sure the sensor pinouts are connected correctly.
Next, confirm the voltage across it's (+) and GND pins, should be 5V as per the circuit.
Once you have confirmed the above take a DMM set at DC voltage range and connect its red prod to the "OUT" terminal of the sensor and black to the negative line of the circuit. Initially it should show 5V, but should respond with a zero volt or a lower voltage than 5V whenever the external IR remote is activated on it.
Please first confirm the above.
Kesavarao Y says
I didn't got 5V relay so I used 12V, but it not on and off why?
ani a says
Dear sir,
intially it shows 2.8v sir
Swagatam says
point and press a TV remote control at the sensor, and check the voltage response at the output of the sensor..it must become zero or almost zero…. if not your sensor may be faulty or not connected correctly.
ani a says
dear sir,
2.9v at sensor "out" terminal and 1v at the "Vs'' .It does not show 5v initially sir please tell what is the problem
Swagatam says
please check the response with a IR transmitter, as explained in the pervious comment.
you can connect an LED in series with R3 for getting indications regarding the switching.
cathode of LED will go to R3, and anode to base of the transistor
ani a says
dear sir,
it does not show 0v on DMM when ever i press button it shows 2.9v constant sir . I use the sensor which is used in our tv it don't have any number but i connect its terminals as TSOP1738 irs sir
Swagatam says
disconnect the output of the sensor from R3 and then check, if still it continues to be the same you can assume the sensor to be faulty or wrongly connected.
If it works correctly would indicate a wrongly connected T1 or a faulty T1
ani a says
sir if i remove the "out" terminal of sensor from R3 the voltage fall from 3v to 0v with out i press a remote
Swagatam says
point and press the Tx at the sensor and see if it produces any changes in potential at the "out" pin, if it doesn't would mean the sensor is faulty.
Saurabh Sinha says
Hello sir…
1. What is the use of TRANSFORMER in this curcuit.
2. Is this work on any T.V and setop box remote?? And which button is responsible for sending signals to receiver curcuit..
Swagatam says
Hello saurabh,
transformer is for stepping down the mains 220V to 12V.
yes any standard IR remote handset should work with the circuit.
Saurabh Sinha says
Hello sir…
In your part list ..
You didn't specify the value RELAY..
PLZ suggest me… Value of RELAY
Swagatam says
If your transformer is 12V, the relay can be also a 12V (coil voltage) with N/O and N/C contacts
Saurabh Sinha says
Hello sir….
You have a timer curcuit for mobile charger or etc..
If i set the timing for 3 hour then after 3 hour curcuit stop the charging…. Or until curcuit will consume 3 hour electricity then it stop charging… Plz suggeste me this type of curcuit..
Because overloading the battery will decrease life of battery.. So plz
Swagatam says
Hello Saurabh, all cell phones have in-built sophisticated over charge cut off circuit so there's nothing to worry, the battery will never get overcharged even it's kept connected to the charger forever.
Saurabh Sinha says
Hello sir….
I hv another question…
In previous comments.. You said about TRANSFORMER that it stepdown 220v to 12v.
If i put directly 12v adaptor… Then it work or not???
Swagatam says
hello saurabh,
a 12V AC/DC adapter will also do…
Anup Paul says
Hi, Can I use it to operate more than one relay at the same time by using other outputs in IC4017. Do I need to change the current rating of the transformer. Pls advise.
Swagatam says
If you are interested to operate other relays in sequence one after the other by using the other outputs of the IC, then you can still continue to go with the same circuit because each relay would be operated individually and never together so there wouldn't be any increase in the current consumption during those operations
sandy says
can u tell me an circuit diagram for drone so that it can fly easily to control its 4 motors
Swagatam says
possibly I may try to publish one using RF remote control….
Kurt Sopa says
In your circuit dia. the negative leg of C2 is connected to Vout of the IRS. Since C2 is a polarized cap., should it not be connected to ground instead?
Swagatam says
C2 is placed across base/emitter of T1 in order to stabilize the T1 response….so it's fine.
darlinton ojo says
its responding very slow. when i plug it the load comes on and when i press the remote button its goes off but when trying to put it on again it wouldn't until Upton 2mins before its responds.pls what should i do?
Swagatam says
reduce C2 value to 10uF/25V and check…..
darlinton ojo says
Enter your comment… thank you for your Quick response ,its kinda working but there is still s problem its changes the state of the load just three times and would stop to work but when i unplug and replug its still repeat same three time and pause.pls help me. its urgent
ojodarlinton@gmail.com
Swagatam says
did you connect pin#4 with pin#15??
anyway just try changing the output pin configuration of the IC 4017 exactly as done with the circuit in the first diagram of this article:
https://homemade-circuits.com/2014/05/remote-control-circuit-for-multiple.html
MOH says
Hello, i made this circuit with a 6V relay ( i dont have 5v ) , but it d'ont work at all !!!!!
pls help :
topo.science@yahoo.fr
thankssss
Swagatam says
connect a red LED in series with the transistor base and first confirm whether or not this LED is responding ON/OFF with remote control button press…if not then there could be something severely wrong in the connections.
MOH says
When i connect a led in the base of transistor the led not flash when I push remote button !!
Swagatam says
check voltage across T1 base and emitter by keeping the black prod of meter at base, and red prod at emitter, and simultaneously by pressing the remote handset button, it should change from 0 to 0.6V….if not check the same across the sensor output pin and supply pin….confirm this first
Aryan Kumar says
Sir plz specify the relay nd its value..
Aryan Kumar says
Sir will it work in 10 volt adapter?
Swagatam says
relay coil voltage should match the adapter voltage, in your case the relay should be also 9V rated
Aryan Kumar says
Thnk u sir …sir where to put the leds….nd what to do with the earthing connection. ..should i leave the earthing or we have to earth them..
Swagatam says
Aryan, you can put the LED in series with R4. The earth symbol represents the negative supply line of the circuit, make sure you connect all the marked points together with the negative supply line of the circuit
Aryan Kumar says
Sir in the pic the ic2 is connected with a green wire.. Confused abt that and where does the green and blue wire leads to??
Swagatam says
probably those are terminated out through a headphone jack for allowing the 5V to be accessible through the jack for some external DC circuit.
Aryan Kumar says
Plz tell me all the 12 v relay connections sir.. M stuck there.. its not working..
Swagatam says
connect the relay coil with the transistor and positive….relay pole contact can be seen connected with the load, and either the N/O or the N/C contact may be selected and connected with one of the mains input, as indicated.
Akula Sai says
Hi sir i am an 9 class student i want to do a project which is to control lights with remote so plzz explain me the above in easy and in regular language so i can do it very ease plzzz sir
Swagatam says
Akula, I have explained all the details in the article already, if you have specific questions you may ask them, I'll try to answer.
Akula Sai says
Sir i cant understand the above names and components so can i have a video with explaining and making of above activity clearly
Swagatam says
Akula, I would suggest that you first learn the basics of electronics and regarding all the electronic components before building any circuit idea, otherwise you may find it extremely difficult and might not succeed.
Daniel Boulanger says
Is there anybody who can provide a picture of their prototype ?
The ones presented in this article are not quite what regular hobbyists would expect.
Seriously, I do understand that this was created by someone with minimal experience, nevertheless any projects with parts floating in the air like that, should be advised that this is not a good practice.
For the sake of everyone, a "cleaner" prototype would be appreciated.
Charles Lukes says
Pls instead of using the rectificaton section can't i just use a 5v dc battery? And how do i connect it to the load?
Swagatam says
you can use a battery, but battery will get discharged at some of time, that's why a mains operated power is recommended.
the relay contacts and the load wires which are shown connected with the mains will need to be connected with the 5V supply
Charles Lukes says
Thank you sir your reply was helpful, what if i want to use both the 5v and mains supply? When there is power outrage and i might want to use the 5v battery so how do i go about it. And pls sir specify the kind of tv remote that would suit it.
Swagatam says
for that you just have to connect the positive of the 5V battery with the output of the 7805 IC through a 1N4007 diode, cathode will connect with the 7805 output and the anode with the batt positive….the negative of the batt will connect with the negative line of the circuit
all and any TV remote should work with this circuit
Mirza Adeel says
I cant see circuit diagram, can anyone share with me. Please.
Swagatam says
use a proxy site….
john kg says
good day sir
i have assembled the circuit. instead of relay i used a led from pin no 2
i found the light is flickering continuously, when i press the remote i can see the light flikering more so i am concluding that the circuit detecting ir signals .but how to make it stable so that i wll be able to connect the relay
i have did all the modifactions u mentioned in the above comments
still its not getting stable
thanking you
john
john
Swagatam says
Good day John,
did you try increasing the value of C6? increase it to 100uF and see the response. if still it's flickering then definitely there's some other fault in your circuit or may be the IC 4017 itself is faulty.
john kg says
sir i assembled the circuit on breadboard only
john
john kg says
what is the value of c3 is any special importance to c3
john
Swagatam says
it's 0.1uF, for decoupling the IC supply pins, and prevent incorrect switching of the IC during power switch ON
siddharth sharad srivastava says
hello sir ,
in this will a 6v relay work or i will have to get a 12v relay.
Swagatam says
hello siddarth, your relay voltage must match the available supply voltage value, or you can use a supply source in accordance with your relay specs….but both must be approximately equal.
however 5V can be used for operating a 6V relay, therefore you can use the 5V from the 7805 for supplying the relay also
H says
Sir
Can I use this TV, ac, and ext..
Swagatam says
yes definitely you can…
H says
Can I use this for TV ,ac ext…
Saqib Lodhi says
Hi Swagatam,
I have successfully built this circuit and it is working perfect. thanks for that. I have an issue like others will have. the TSOP1738 is picking up any remote key pressed which is making not acceptable for any home appliances because In same room I use my TV, AC and many other remote controlled devices and this is picking up signals from any remote with any key press. Can you please suggest some additional circuit for it to only pickup the signals from specific key from remote. I am also good to make a transmitter for this too.
Swag says
Hi Saqib,
To correct this issue you may have to modulate the 38kHz frequency from the remote with another frequency and then use an intermeiate LM567 IC based circuit to detect this modulated frequency, this will allow you to get a intended unique frequency operation, if possible I’ll try to update the design soon in my website
Saqib Lodhi says
wow that would be great. I am waiting for your new design and will continue upgrading this circuit using your guidance. Thanks Swagatam I appreciate your response.
Swag says
sure, if possible I’ll try to do it soon..
Saqib Lodhi says
whenever you do it. just drop me a message on saqib.lodhi@hotmail.com to check it on your blog.
Swag says
OK, I will try!